Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack – 2022 BrightDrop EV600 & 2022-2023 GMC Hummer EV Pickup

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VSSM -012731 I Nov2022 I 480px EMAIL I GMC HUMMER EV Recall I GM01: Current Owners In Possession FROM: SUBJECT: Your GMC Team Important Safety Information Regarding Your GMC HUMMER EV Edition 1 PROGRAMMED PREHEADER: 0 0 0 I® ·•II+-<+- • ~IT0t](E IMPORTANT SAFETY INFORMATION REGARDING YOUR GMC HUMMER EV EDITION 1 [Firstname], General Motors is voluntarily conducting a safety recall that involves your HUMMER EV Edition 1 Pickup. In some of the recalled vehicles, the high-voltage battery pack enclosure may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. If water enters the battery pack enclosure, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message. Your vehicle may not start or could lose propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. GM is quickly working to develop a remedy and will continue to notify you when that remedy is available. Until the remedy is available, your vehicle can be driven and charged normally. But as a precaution, do not drive your vehicle through deep water (over 24 inches deep). We will provide you with more information as soon as it’s available. If you have any questions or concerns, please contact the HUMMER EV Concierge at 1-833-HUMMEREV or your preferred GMC HUMMER EV dealer. [Hometown Motors of Hometown] [(123)-456-7890) VISIT US ONLINE To ensure you receive your GMC em:ilt!.I,, please add Your GMC Team mulls.GMC.com to your Addres-s Book. The marks of Ganoral Motors, its divisions. slogans, ombloms, vehicle modol names, voMcio body designs ond othor morks OP1)Goring in this omail aro tho tradomotkn ond/or sorvieo marks of Gonoral Motors, ile 5Ubsld&6ries, affiliates or licensOl’s. You are recetvlng thla email becaui;e you are a valued GMC customer. Co I & Tradomork I GM Privoc Statomont GMC 1100 Renaissance Center 1482.AOO.MAR I Oetrolt. Ml 48265 I 1-800-462-8782 e 2022 General Matar&. All rights rosorvod. GM01 RECALL

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IMPORTANT SAFETY RECALL December 2022 This notice applies to your vehicles, VINs noted in the attached. Dear BrightDrop Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products. IMPORTANT • Your vehicle is involved in GM safety recall N222380032. • Until the recall remedy is available, your vehicle can be driven and charged normally. But as a precaution, do not drive your vehicle through deep water (over 24 inches deep). Why is your vehicle being recalled? In some of the recalled vehicles, the high-voltage battery pack enclosure may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. If water enters the battery pack enclosure, one or more malfunction indicator lamps may illuminate and the driver information center may display a warning message to the driver. Your vehicle may not start or could lose propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. What will we do? GM is working to develop a remedy for this condition. When the remedy and parts are available, we will send you another letter asking you to take your vehicle to your BrightDrop dealer to have your vehicle serviced. This service will be performed for you at no charge. You can also check the status of this recall at: https://my.gm.com/recalls. Do you have questions? If you have questions or concerns that your dealer is unable to resolve, please contact BrightDrop Service Operations and Support at 1.888.987.4377. If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE., Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to http://www.nhtsa.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 22V771. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. Regina A. Carto Vice President Global Product Safety and Systems GM Recall: N222380032

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IMPORTANT SAFETY RECALL December 2022 This notice applies to your vehicle, VIN: __________________________________ Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 – 2023 model year GMC HUMMER vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products. IMPORTANT • Your vehicle is involved in GM safety recall N222380031. • Until the recall remedy is available, your vehicle can be driven and charged normally. But as a precaution, do not drive your vehicle through deep water (over 24 inches deep). Why is your vehicle being recalled? In some of the recalled vehicles, the high-voltage battery pack enclosure may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. If water enters the battery pack enclosure, one or more malfunction indicator lamps may illuminate and the driver information center may display a warning message to the driver. Your vehicle may not start or could lose propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. What will we do? GM is working to develop a remedy for this condition. When the remedy and parts are available, we will send you another letter asking you to take your vehicle to your GM dealer to have your vehicle serviced. This service will be performed for you at no charge. You can also check the status of this recall at: https://my.gm.com/recalls. Do you have questions? If you have any questions or concerns that your preferred GMC HUMMER EV dealer is unable to resolve, please contact the EV Concierge at 1-833-HUMMER-EV (1-833-486-6373) (TTY 711 / 1-800-833-2438). For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle. If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE., Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to http://www.nhtsa.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 22V771. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. Regina Carto Vice President Global Vehicle Safety and Systems GM Recall: N222380031

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Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Copyright 2023 General Motors. All Rights Reserved. Page 1 of 15 Release Date: May 2023 Revision: 03 Revision Description: This bulletin has been revised to update one of the High Voltage Drive Motor Cable part numbers. Please discard all previous copies of N222380031-02. Attention: It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in this bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle. This is a phased launch. As VINs become eligible for final repair, they will be moved to an “Open” status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. For Canadian Dealers: Only GMC Dealers who have signed the GMC Electric Models Agreement and have met all the GMC HUMMER EV-specific training, tools, and equipment requirements are eligible to complete the repair. Any Dealer unsure of their eligibility status should immediately review with their District Service Manager. Danger: Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed in order to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Important: Dealers must submit a core return request through the “SNT ALFRED – High Voltage Battery Order and Returns” app in Global Connect. The app is available in the Global Connect Center. It is the same app used to order batteries for the recall. DO NOT CALL CCA Logistics or XPO directly. Important: Shipment of these high voltage batteries is regulated by dangerous goods transportation laws. GM Dealer Parts and Accessories Policies and Procedures requires that dealers comply with all applicable dangerous goods transportation laws, including but not limited to having at least one employee be certified in the transportation of dangerous goods as required by law. Additional resources for dangerous goods transportation can be found as part of appendix G in the latest version of Service Bulletin #99-00-89-019. As the shipper of record, dealers are responsible for compliance with all applicable international, federal, state, provincial, or local dangerous goods transportation laws. This includes, but is not limited to, proper labeling, marking, completion of shipping papers, and packaging. Failure to comply with federal dangerous goods transportation laws may result in a violation of the U.S. Hazardous Materials Transportation Act, as amended, and its implementing regulations issued by the U.S. DOT at Title 49, Volumes 2-3, of the CFR and could subject you to fines of up to $89,678 for each violation, except the maximum fine is $209,249 if the violation results in death, serious illness, or severe injury to any person or substantial destruction of property. Danger: Prior to packaging and requesting the core return through the SNT ALFRED App via Global Connect, you are required to verify the core is safe to return by checking one of the following 2 boxes below. If the criteria is not met by either box, the battery is NOT OK to Ship back. You are Required to call TAC and obtain verification that the battery is OK to Ship before it can be returned. Box1 – There were no issues found as outlined in service procedure steps 1 through 5 (“Return Battery Shipping Check List”), battery core is OK to Ship back. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 2 of 15 Box2 – There was an issue found with one or more service procedure steps 1 through 5 (“Return Battery Shipping Check List”). However, TAC provided authorization that battery is OK to Ship back. Provide TAC case # (enter here). Make Model Model Year RPO Description From To GMC HUMMER EV 2022 2023 Involved vehicles are marked “Open” on the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs. Condition General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022-2023 model year GMC HUMMER EV vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Correction Dealers will replace high-voltage battery packs. Parts Quantity Part Name Part No. 1 High Voltage Battery Assembly * As Req. High Voltage Drive Motor Cable 86783177 As Req High Voltage Drive Motor Cable 86783176 6 Engine Coolant 12378390 US 10953456 CA * See “Parts Ordering Information” section below. Storage Guidelines for Containerized High Voltage Batteries • Store the High Voltage Battery and shipping crate flat. • Protect the High Voltage Battery and shipping crate from exposure to liquids, including rain and snow. • Protect the High Voltage Battery and shipping crate from physical damage. Parts Ordering Information For US Dealers: In order to simplify the ordering process for high voltage batteries necessary to perform repairs under THIS RECALL, the high voltage battery ordering process requiring authorization from the Technical Assistance Center (TAC) is not required. Battery ordering will be completed using the “SNT ALFRED – High Voltage Battery Order and Returns” app in GlobalConnect. The application can be located in either the “App Center” or “Parts Department” in GlobalConnect. All other high voltage battery orders NOT related to the recall must continue to be authorized through Technical Assistance. Once you locate and enter the app you will be connected directly to the SNT ALFRED portal. At this point simply click “Create New Order” to begin the process to order a high voltage battery. Before visiting the SNT ALFRED ordering portal, please have all required information available (shown below). Please be advised that you will be restricted from ordering a High Voltage Battery, if you have not met all the EV requirements. An applicable forklift on premise, hoist meeting the specifications published in 22-NA-114, the essential tools to perform the recall (listed below), applicable charger and certified EV technician are required. Note that in addition to order placement, this app is also used to arrange for the high voltage battery core return and to request replacement packaging material and parts. 6305350 For Canadian Dealers: Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 3 of 15 High voltage batteries may be ordered from York Electronics by logging onto the York Electronics website (www.yorkelec.com) using the username and password created for your Dealership. Canadian dealer online order process: • Log in to the website. • Click on the GMC HUMMER / BrightDrop Battery Recall icon. • Complete all required fields and submit the order. • A copy of the order will be emailed to the email address used to log into the online order system. • Once the order is processed by the York Electronics order desk, a confirmation email from York will be sent indicating the order was successfully received. Note: For concerns with the online ordering process, please contact YORK ELECTRONICS OSHAWA at 1-888-650-9675 ext. 307. Required Information for U.S. and Canada Dealer Name: __________________ Dealer Code: _________________________ Shipping Address: ______________________________________ Contact At Dealership (include phone number and email address): _____________________ Dealerships Preferred Dealer Delivery Time/Date for Dealer Forklift Operator (Must be within 24 hours of the order time): _________________________ Hours of operation: _________________ VIN #_________________________ Old Battery Identification Number (BIN): __________________ Model Year: _________________ Parts Retention and Return Parts Retention and Returns (United States Service Agents ONLY) All high voltage batteries are GM assets and must be returned. Dealers are to return the high voltage battery as soon as possible after completion of the repair. If the batteries are not returned, the dealer will be invoiced for the core charge. Important: Shipment of these high voltage batteries is regulated by dangerous goods transportation laws. GM Dealer Parts and Accessories Policies and Procedures requires that dealers comply with all applicable dangerous goods transportation laws, including but not limited to having at least one employee be certified in the transportation of dangerous goods as required by law. Additional resources for dangerous goods transportation can be found as part of appendix G in the latest version of Service Bulletin #99-00-89-019. As the shipper of record, dealers are responsible for compliance with all applicable international, federal, state, provincial, or local dangerous goods transportation laws. This includes, but is not limited to, proper labeling, marking, completion of shipping papers, and packaging. Failure to comply with federal dangerous goods transportation laws may result in a violation of the U.S. Hazardous Materials Transportation Act, as amended, and its implementing regulations issued by the U.S. DOT at Title 49, Volumes 2-3, of the CFR and could subject you to fines of up to $89,678 for each violation, except the maximum fine is $209,249 if the violation results in death, serious illness, or severe injury to any person or substantial destruction of property. High Voltage Battery Core Return Process (United States Service Agents ONLY) Important: Dealers must submit a core return request through the “SNT ALFRED – High Voltage Battery Order and Returns” app in Global Connect. The app is available in the Global Connect Center. It is the same app used to order batteries for the recall. DO NOT CALL CCA Logistics or XPO directly. Danger: Prior to packaging and requesting the core return through the SNT ALFRED App via Global Connect, you are required to verify the core is safe to return by checking one of the following 2 boxes below. If the criteria is not met by either box, the battery is NOT OK to Ship back. You are Required to call TAC and obtain verification that the battery is OK to Ship before it can be returned. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 4 of 15 Box1 – There were no issues found as outlined in service procedure steps 1 through 5 (“Return Battery Shipping Check List”), battery core is OK to Ship back. Box2 – There was an issue found with one or more service procedure steps 1 through 5 (“Return Battery Shipping Check List”). However, TAC provided authorization that battery is OK to Ship back. Provide TAC case # (enter here). DO NOT wait for the warranty claim to be processed before returning the removed high voltage battery. This part is GM’s material and is not claimed under the warranty labor operation. Place a copy of the repair order with the high voltage battery to be returned. Failure to return a copy of the repair order with the shipment may result in a debit. Attach the completed return shipping tag to the shipping crate. DO NOT return the high voltage battery in any crate other than the crate that the service high voltage battery was delivered in. The removed unit must be returned complete in the original shipping crate. For questions about your order status, how to return exchanged material, or to verify battery receipt contact: 1-833-33 GM BSC (1-833-334-6272) High Voltage Battery Core Return Process (Canadian Service Agents ONLY) Important: For shipping preparation instructions, refer to “Final Shipping Preparation” information following the Service Procedure at the end of this bulletin. Danger: Prior to packaging and requesting the core return through York Electronics (www.yorkelec.com), you are required to verify the core is safe to return by checking one of the following 2 boxes below. If the criteria is not met by either box, the battery is NOT OK to Ship back. You are Required to call TAC and obtain verification that the battery is OK to Ship before it can be returned. Box1 – There were no issues found as outlined in service procedure steps 1 through 5 (“Return Battery Shipping Check List”), battery core is OK to Ship back. Box2 – There was an issue found with one or more service procedure steps 1 through 5 (“Return Battery Shipping Check List”). However, TAC provided authorization that battery is OK to Ship back. Provide TAC case # (enter here). Email to arrange LTL pickup for the high voltage battery: Send an email to: [email protected]. You will be required to provide size (l x w x h) and weight. This information is available on the GM0003 tag. If your facility does not have a loading dock, please ensure RXO understands that this shipment will be loaded at ground level. (LTL carrier will need to bring required equipment). Specify Return address: Vancouver Serviced Dealers: TST Overland Express Burnaby 7867 Express Street 111 Burnaby, BC Edmonton Serviced Dealers: Day & Ross Edmonton X-Dock 11727 – 178th Street Edmonton, Alberta Woodstock Serviced Dealers: Day & Ross Woodstock X-Dock 520 Beards Lane, Unit B Woodstock, Ontario Montreal Serviced Dealers: Day & Ross Montreal X-Dock 5000 Trans Canada Hwy Pointe Claire, PQ For individual batteries over 500 kg. (1102 lbs.) – included with your new battery will be four (4) Class 9 TDG placards. Please provide these to the driver and ensure placards are affixed to the vehicle before departing. Refer to GM GlobalConnect for the latest GM Canada Parts Bulletin (GMP2021-213) relating to procedures for return of EV Batteries or Sections. This can be found under Parts Bulletins & Resources located in the application section of the Parts Department page. Canadian Dealers DO NOT return batteries to the ESC or to the WPC. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 5 of 15 Note: If the removed high voltage battery is not returned, the entire transaction will be debited, and the dealer will also be charged the value of a service high voltage battery. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106527* 2022 model year only: Hybrid/Electric Vehicle Battery Pack Replacement and Shipping Preparation (Includes K16K107 – Battery Energy Control Module / Drive Motor Control Modules Sequence Programming) ADD: Crating and Uncrating ADD: Diagnosis 11.4 1.8 0.3-1.0**** ZFAT ** 9106636* 2023 model year only: Hybrid/Electric Vehicle Battery Pack Replacement and Shipping Preparation (Includes K16 – Battery Energy Control Module Programming) ADD: Crating and Uncrating ADD: Diagnosis 11.3 1.8 0.3-1.0**** ZFAT ** 9106736 Floor Plan Reimbursement – NEW INVENTORY ONLY N/A ZFAT *** **** If more diagnosis time is required than 1.0, you may claim OLH. Note: To avoid having to “H” route the floor plan transaction for approval, it must be submitted prior to the repair transaction. Important: * To avoid warranty transaction rejections, the Warranty Administrator will need to carefully read and follow the instructions below: 6125814 • Required (Warranty Administrator) – The Warranty Claim Code must be accurately entered in the “Warranty Claim Code” field of the transaction. • When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by SPS/SPS2. • Required (Warranty Administrator) – Document the OLD and NEW Battery BINs in the “Correction” field on the job card (per Technician Old and New Battery BIN recording on repair order in service procedure step 5). ** Submit a $520.00 USD ($624.00 CAN) administrative part allowance. Add this amount in the Administrative Allowance Net Item field when submitting the repair transaction. ** Submit a $700.00 USD ($950.00 CAN) administrative allowance for recall specific impacts to technician and service department throughput, Business Development Centers, high voltage battery handling and storage, and miscellaneous shop supplies. ** Submit a $20.00 ($25.00 CAN) administrative allowance for return of the used high voltage battery assembly (document preparation and packaging). Add this amount in the Administrative Allowance Net Item field when submitting the repair transaction. ** Involved vehicle owners are eligible for courtesy transportation while their vehicle is being repaired. If courtesy transportation is required, add the actual cost in the appropriate Net Item field when submitting the repair Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 6 of 15 transaction. Refer to GM Warranty Administration Bulletin 18-NA-094 for Courtesy Transportation Program guidelines. Warranty Claim Code Information Retrieval 6125774 If the Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows: 1. Open TIS/TLC on the computer used to program the vehicle. 2. Select and start SPS/SPS2. 3. Select Settings. 4. Select the Warranty Claim Code tab. The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code field. Floor Plan Reimbursement – NEW INVENTORY ONLY *** USA Only – For vehicles eligible for floor plan reimbursement, the amount should be submitted in Net Item/Miscellaneous. This amount should represent the product of the vehicle’s average daily interest rate (see table below) multiplied by the actual number of days the vehicle was in dealer inventory and not available for sale. This reimbursement is limited to the number of days from the date of the stop delivery message October 13, 2022, to the date the VIN was placed in “Open” status in IVH. (Maximum Number of days for Floor Plan is calculated from the “Release Date” on VINs in “Open” Status in IVH, and will be adjusted as additional releases occur.) Vehicle Floor Plan Reimbursement Amount USA Canada 2022 GMC HUMMER EV $28.33 N/A 2023 GMC HUMMER EV TBD N/A Special Tools Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 7 of 15 EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool REQUIRED: Replacement Battery Identification Number (BIN) Recording (CSMT RPT Method) IMPORTANT: * (TECHNICIAN) the OLD and NEW BATTERY IDENTIFICATION NUMBER (BIN) RECORDING IS REQUIRED per the information in the Service Procedure. It is REQUIRED to record the Battery Identification Number (BIN) using the Certified Service Mobile Toolbox (CSMT) Replacement Part Traceability (RPT) App. Refer to TSB 22-NA-070 for specific information on downloading the App to your mobile phone, how to use/submit the new part serial number/QR code information and other related Q and A. 6305467 If the App is already loaded to your phone, simply: 1. Log into the CSMT RPT application 2. Scan the Vehicle VIN (door pillar QR code or windshield VIN barcode) that the new part is going into and 3. Scan the new part label QR code as shown above and 4. Check the information and if correct then, Submit. (Note: you can verify submission by checking your phone outgoing emails) 5. Repeat steps 1-4 above for Old and New Battery Failure to submit this serial number by RPT may cause the claim to reject. Service Procedure Danger: Failure to use the proper Personal Protective Equipment and failure to carefully follow these procedures may result in serious injury or death. Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. Return Battery Shipping Check List – Steps 1-5 1. Using the MDI2, check all modules for the following DTCs; U2BFC, U2220-U2237, U1666, U1667, U2426, U2427, U359E, P0AA6. • If ANY of the above DTCs are set (current OR history), stop work immediately, record the data that was incorrect and contact TAC (for additional diagnostics, battery storage, handling, and shipping information). • If NONE of those DTCs are set, continue to the next step. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 8 of 15 6305383 2. With the MDI2 and GDS, observe and record the battery energy control module parameter(s) in GDS (example of the correct data screen shown above). Under Module Diagnostics, select K16 – Battery Energy Control Module -> Data Display -> High Voltage Isolation Data. • If value IS below 6.3 MOhm, rerun the isolation test (select Hybrid/Electric Vehicle Battery Pack Active Isolation Test in GDS). • If value remains below 6.3 MOhm, stop work immediately, record the data that was incorrect and contact TAC (for additional diagnostics, battery storage, handling, and shipping information). • If value is NOT below 6.3 MOhm, proceed to next step. 6305377 3. With the MDI2 and GDS, observe and record the battery energy control module parameter(s) in GDS (example of the correct data screen shown above). Under Module Diagnostics, select K16 – Battery Energy Control Module -> Data Display -> Hybrid/Electric Vehicle Battery Pack Temperature Data. Ensure Hybrid/Electric Vehicle Battery Pack Thermal Event Gas Sensor and Hybrid/Electric Vehicle Battery Pack Thermal Event Gas Sensor 2 both display 30,000 PPM or less. • If either sensor is greater than 30,000 PPM, TURN OFF AND EXIT THE VEHICLE. Stop work immediately, record the data that was incorrect and contact TAC (for additional diagnostics, battery storage, handling, and shipping information). • If both sensors do not exceed 30,000 PPM or gas level decreases proceed to the next step. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 9 of 15 6305357 4. With the MDI2 and GDS, observe and record the battery energy control module parameter(s) in GDS (example of the correct data screen shown above). Under Module Diagnostics, select K16 – Battery Energy Control Module -> Data Display -> Hybrid/Electric Vehicle Battery Module Temperature Data. Ensure Hybrid/Electric Vehicle Battery Interface Control Module 1 thru Module 24 Temperature 1 and 2 are all within 5C degrees of each other. Additionally, ensure none exceed 35C. • If any temperature is 5C degrees greater than the others or exceeds 35C, TURN OFF AND EXIT THE VEHICLE. Stop work immediately, record the data that was incorrect and contact TAC (for additional diagnostics, battery storage, handling, and shipping information). • If all temperatures are within 5C of each other and do not exceed 35C: – Inspection is complete. Danger: If any liquid drips from any of the Battery Pack electrical connectors (or the inspection port/drain plug on the high voltage battery) while disconnecting them, finish battery replacement as quickly as possible and immediately place the removed Battery Pack outside, and contact TAC (for additional diagnostics, battery storage, handling, and shipping information). Note: The new Battery Pack provided may have slight differences from your existing battery, such as a lack of the metal heat shields. It is not necessary to transfer anything from the old Battery Pack to the new one. 5. Replace the Hybrid/Electric Vehicle Battery Pack. Refer to Hybrid/Electric Vehicle Battery Pack Replacement and Shipping Preparation in SI. • Refer to bulletin 22-NA-005 for additional container-specific information on uncrating the new battery you will receive. This bulletin also contains information on packaging and crating the battery that will be removed from the vehicle for return to GM. – After reviewing document 22-NA-005, refer to Hybrid/Electric Vehicle Battery Pack Lifting System and remove the replacement battery pack from the shipping crate. Place the replacement battery pack onto the 4 inch x 4 inch x 8 foot boards. Then remove the EL-53097 EV Battery Lifting Eyebolts for later transfer onto the defective battery pack. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 10 of 15 6305405 – Prior to removing the Battery Assembly from the vehicle, after disconnecting the High Voltage connectors, remove the inspection port/drain plug (circled above) to see if any fluid drains, then reinstall the plug. + If fluid drains from the High Voltage connectors or the inspection port/drain plug, refer to the danger statement above step 5. + If no fluid drains from either area, proceed to the next step. 6305353 • REQUIRED (Technician) – Locate the BIN label on the rear of the battery and record the BIN of both the old and new battery packs on the repair order. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 11 of 15 Programming Procedure Notes: Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector (DLC). If there is an interruption during programming, programming failure or control module damage may occur. Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required, install a battery maintainer or power supply that provides a steady and stable voltage. Do not use a battery charger, as charging voltage will often fluctuate when connected to the vehicle. This may interrupt programing. If a battery maintainer is not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc. During the programming procedure, follow the SPS prompts for the correct propulsion system state. Clear DTCs after programming is complete. 6. Prior to programming, ensure there are no latched High Voltage DTCs. Refer to Clear Secured High Voltage DTCs in SI. 6305469 7. Program the vehicle using the MDI2 and Techline Connect. • For MY 22 HUMMER EV – Select the sequenced programming event “K16K107 – Battery Energy Control Module / Drive Motor Control Modules”, as shown above, and then follow the on-screen instructions. • For MY 23 HUMMER EV – Select “K16 – Battery Energy Control Module”, and then follow the on-screen instructions. 6305530 Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 12 of 15 • If the above message appears on the IPC, disconnect the 12v battery system negative cable and wait at least 10 minutes before reconnecting the battery again and starting at step 5. Refer to Battery Negative Cable Disconnection and Connection in SI. If any other trouble is encountered with programming, contact Techline at 1-800-828-6860. 5644478 Note: The screenshot above is an example of module programming and may not be indicative of the specific module that is being programmed. Module selection and VIN information have been blacked out. Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the Warranty Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the WCC on the screen. • Record SPS Warranty Claim Code on job card for warranty submission. Dealer Responsibility – For USA & Export (USA States, Territories, and Possessions) It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time. Dealer Responsibility – All All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this recall must be held and inspected/repaired per the service procedure of this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration, or any other purpose. All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within the CPOIS system, or once again be used in the CTP program. Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 13 of 15 In summary, whenever a vehicle subject to this field action enters your vehicle inventory you must take the steps necessary to ensure the program correction has been made before selling the vehicle. In addition, for vehicles entering your facility for service, you are required to ensure the customer is aware of the open field action and make every reasonable effort to implement the program correction as set forth in this bulletin prior to releasing the vehicle. Dealer Reports – For USA & Export For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that apply to this recall. This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall may be a violation of law in several states. Courtesy Transportation – For USA & Canada Courtesy transportation is available for customers whose vehicles are involved in a product program and still within the warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation program details. Customer Notification USA & Canada – General Motors will notify customers of this recall on their vehicle (see copy of customer letter included with this bulletin). GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information. We Support Voluntary Technician Certification Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 14 of 15 IMPORTANT SAFETY RECALL April 2023 This notice applies to your vehicle, VIN: _____________________________________ Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022-2023 model year GMC HUMMER EV vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products. IMPORTANT • Your vehicle is involved in GM safety recall N222380031. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. • Until the repair is completed, your vehicle can be driven and charged normally. But as a precaution, do not drive your vehicle through deep water (over 24 inches deep). Why is your vehicle being recalled? In some of the recalled vehicles, the high-voltage battery pack enclosure may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. If water enters the battery pack enclosure, one or more malfunction indicator lamps may illuminate and the driver information center may display a warning message to the driver. Your vehicle may not start or could lose propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. What will we do? Your GMC dealer will replace high-voltage battery packs. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle for 1-2 days to complete the repair. What should you do? You should contact your GMC dealer to arrange a service appointment as soon as possible. When scheduling your appointment, confirm with the dealer that they are an EV certified dealer. Do you have questions? If you have any questions or concerns that your preferred GMC HUMMER EV dealer is unable to resolve, please contact the EV Concierge at 1-833-HUMMER-EV (1-833-486-6373) (TTY 711 / 1-800-833-2438). For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle. Division Number Text Telephones (TTY) GMC HUMMER EV/SUV 1-833-HUMMER-EV (1-833-486-6373) 711 / 1-800-833-2438 Puerto Rico – English 1-866-467-9700 Puerto Rico – Español 1-866-467-9700 Virgin Islands 1-866-467-9700 If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Product Safety Recall N222380031 Improper Urethane Sealing – High Voltage Battery Pack Page 15 of 15 Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to http://www.nhtsa.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 22V771. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. Regina A. Carto Vice President Global Product Safety and Systems GM Recall: N222380031

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IMPORTANT SAFETY RECALL April 2023 This notice applies to your vehicle, VIN: _____________________________________ Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022-2023 model year GMC HUMMER EV vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products. IMPORTANT • Your vehicle is involved in GM safety recall N222380031. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. • Until the repair is completed, your vehicle can be driven and charged normally. But as a precaution, do not drive your vehicle through deep water (over 24 inches deep). Why is your vehicle being recalled? In some of the recalled vehicles, the high-voltage battery pack enclosure may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. If water enters the battery pack enclosure, one or more malfunction indicator lamps may illuminate and the driver information center may display a warning message to the driver. Your vehicle may not start or could lose propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. What will we do? Your GMC dealer will replace high-voltage battery packs. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle for 1-2 days to complete the repair. What should you do? You should contact your GMC dealer to arrange a service appointment as soon as possible. When scheduling your appointment, confirm with the dealer that they are an EV certified dealer. Do you have questions? If you have any questions or concerns that your preferred GMC HUMMER EV dealer is unable to resolve, please contact the EV Concierge at 1-833-HUMMER-EV (1-833-486-6373) (TTY 711 / 1-800-833-2438). For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle. Division Number Text Telephones (TTY) GMC HUMMER EV/SUV 1-833-HUMMER-EV (1-833-486-6373) 711 / 1-800-833-2438 Puerto Rico – English 1-866-467-9700 Puerto Rico – Español 1-866-467-9700 Virgin Islands 1-866-467-9700 If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to http://www.nhtsa.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 22V771. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. Regina A. Carto Vice President Global Product Safety and Systems GM Recall: N222380031

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Reference Number: GCUS-3-2927 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6559 URGENT – DISTRIBUTE IMMEDIATELY Date: May 9, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6503 URGENT – DISTRIBUTE IMMEDIATELY Date: March 29, 2023 Subject: N222380031 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Models: 2022 GMC HUMMER EV To: Select General Motors Dealers General Motors is releasing Safety Recall N222380031 today. This will be a phased launch. The total number of U.S. vehicles involved in this first phase is 9. Please see the attached bulletin for details. As VINs become eligible for final repair, they will be moved to an “Open” status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing The customer letter mailing for this first phase will begin on April 13, 2023. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated March 29, 2023. A list of vehicles in dealer inventory is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6307 URGENT – DISTRIBUTE IMMEDIATELY Date: October 13, 2022 Subject: Stop Delivery Order for Upcoming Safety Recall N222380030 Improper Urethane Sealing – High Voltage Battery Pack Models: 2022-2023 GMC HUMMER EV To: All General Motors Dealers STOP DELIVERY ORDER Effective immediately, stop the delivery of certain 2022-2023 model year GMC HUMMER EV vehicles in new or used vehicle inventory. General Motors has notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming safety recall that involves these vehicles. The GM recall number is N222380030. It is a violation of federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification until the defect is remedied. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. GM is working to develop a remedy for this condition. Until further instructions are received, involved vehicles that are in dealers’ possession (new or used vehicle inventory, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc.) must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration purposes or any other dealer use. All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified. The Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system has been updated for this upcoming recall. This action has been taken to assist dealers with determining which vehicles are involved so they can properly respond to customer inquiries. A list of involved vehicles that have been identified as being in dealer new vehicle inventory is attached to this message. It is sorted by dealer Business Associate Code (BAC) for easy reference. Your dealership’s BAC will not be listed if none of the involved vehicles are currently in your new vehicle inventory. To identify involved vehicles in dealer used inventory, run an Open VIN Report or Field Action Initiation Report using Field Action Reports-GFAM within the Maxis Dealer Application in GlobalConnect. Question and Answer Document (Q&A) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Until the recall bulletin is released, the Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system will display “10/13/2022” under Release Date and “Incomplete – Remedy Not Available” under Status. This means the required repair is not yet available and dealers should not attempt to perform any repairs. We are working to develop a remedy as quickly as possible. When a remedy is available and sufficient quantity of parts are available, the recall bulletin will be released and dealers can begin repairing vehicles. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-3009 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6653 URGENT – DISTRIBUTE IMMEDIATELY Date: August 17, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022-2023 GMC HUMMER EV To: All General Motors Dealers Additional 2022-2023 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2955 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6591 URGENT – DISTRIBUTE IMMEDIATELY Date: May 31, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2997 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6643 URGENT – DISTRIBUTE IMMEDIATELY Date: August 9, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6537 URGENT – DISTRIBUTE IMMEDIATELY Date: April 18, 2023 Subject: N222380031-01 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Models: 2022 GMC HUMMER EV To: All General Motors Dealers General Motors is releasing Safety Recall N222380031-01 to all dealers today. The total number of U.S. vehicles involved is approximately 700. This will be a phased launch with 31 VINs moving to an “Open” status in IVH today. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. Please see the attached bulletin for details. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers when they will be ‘Open’ at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing The customer letter mailing for this phase will begin in May. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated April 18, 2023. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2971 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6608 URGENT – DISTRIBUTE IMMEDIATELY Date: June 20, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2966 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6602 URGENT – DISTRIBUTE IMMEDIATELY Date: June 13, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2937 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6570 URGENT – DISTRIBUTE IMMEDIATELY Date: May 16, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6318 URGENT – DISTRIBUTE IMMEDIATELY Date: October 26, 2022 Subject: Update on Stop Delivery Order for Upcoming Safety Recall N222380030 Improper Urethane Sealing – High Voltage Battery Pack VINS Moved to new Safety Recall N222380031 Models: 2022-2023 GMC HUMMER EV To: All General Motors Dealers STOP DELIVERY ORDER As previously communicated on October 13, 2022 via GlobalConnect Message GCUS- 3-2671, certain 2022-2023 model year GMC HUMMER EV vehicles in new vehicle inventory were placed on stop delivery. This communication is to inform you that the VINS previously included in Stop Delivery N222380030 have been moved to new Safety Recall N222380031. All VINS will remain in Incomplete. Remedy Not Available status. It is a violation of federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification until the defect is remedied. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. GM is working to develop a remedy for this condition. Until further instructions are received, involved vehicles that are in dealers’ possession (new or used vehicle inventory, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc.) must be held and not delivered to customers, dealertraded, released to auction, used for demonstration purposes or any other dealer use. All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified. The Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system has been updated for this upcoming recall. This action has been taken to assist dealers with determining which vehicles are involved so they can properly respond to customer inquiries. A list of involved vehicles that have been identified as being in dealer new vehicle inventory is attached to this message. It is sorted by dealer Business Associate Code (BAC) for easy reference. Your dealership’s BAC will not be listed if none of the involved vehicles are currently in your new vehicle inventory. To identify involved vehicles in dealer used inventory, run an Open VIN Report or Field Action Initiation Report using Field Action Reports-GFAM within the Maxis Dealer Application in GlobalConnect. Question and Answer Document (Q&A) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Until the recall bulletin is released, the Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system has been updated to display “10/25/2022” under Release Date and “Incomplete. Remedy Not Available” under Status. This means the required repair is not yet available and dealers should not attempt to perform any repairs. We are working to develop a remedy as quickly as possible. When a remedy is available and sufficient quantity of parts are available, the recall bulletin will be released, and dealers can begin repairing vehicles. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS GLOBAL SAFETY FIELD INVESTIGATIONS DCS6319 URGENT – DISTRIBUTE IMMEDIATELY Date: October 26, 2022 Subject: Update on Stop Delivery Order for Upcoming Safety Recall N222380030 Improper Urethane Sealing – High Voltage Battery Pack VINS Moved to new Safety Recall N222380032 Models: 2022 BrightDrop EV600 To: BrightDrop Dealer STOP DELIVERY ORDER As previously communicated on October 13, 2022 via GlobalConnect Message Reference Number: 202210130011, certain 2022 model year BrightDrop EV600 vehicles in new vehicle inventory were placed on stop delivery. This communication is to inform you that the VINS previously included in Stop Delivery N222380030 have been moved to new Safety Recall N222380032. All VINS will remain in Incomplete. Remedy Not Available status. It is a violation of federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification until the defect is remedied. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. GM is working to develop a remedy for this condition. Until further instructions are received, involved vehicles that are in dealers’ possession (new or used vehicle inventory, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc.) must be held and not delivered to customers, dealertraded, released to auction, used for demonstration purposes or any other dealer use. All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified. The Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system has been updated for this upcoming recall. This action has been taken to assist dealers with determining which vehicles are involved so they can properly respond to customer inquiries. A list of involved vehicles that have been identified as being in dealer new vehicle inventory is attached to this message. It is sorted by dealer Business Associate Code (BAC) for easy reference. Your dealership’s BAC will not be listed if none of the involved vehicles are currently in your new vehicle inventory. To identify involved vehicles in dealer used inventory, run an Open VIN Report or Field Action Initiation Report using Field Action Reports-GFAM within the Maxis Dealer Application in GlobalConnect. Question and Answer Document (Q&A) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Until the recall bulletin is released, the Investigate Vehicle History (IVH) screen in the Global Warranty Management (GWM) system has been updated to display “10/25/2022” under Release Date and “Incomplete. Remedy Not Available” under Status. This means the required repair is not yet available and dealers should not attempt to perform any repairs. We are working to develop a remedy as quickly as possible. When a remedy is available and sufficient quantity of parts are available, the recall bulletin will be released, and dealers can begin repairing vehicles. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2917 N222380031-02 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6550 URGENT – DISTRIBUTE IMMEDIATELY Date: May 2, 2023 Subject: N222380031-02 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2946 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6580 URGENT – DISTRIBUTE IMMEDIATELY Date: May 23, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2963 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6599 URGENT – DISTRIBUTE IMMEDIATELY Date: June 6, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2980 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6619 URGENT – DISTRIBUTE IMMEDIATELY Date: July 11, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6512 URGENT – DISTRIBUTE IMMEDIATELY Date: March 31, 2023 Subject: REVISION: N222380031-01 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Revised Warranty Section Models: 2022 GMC HUMMER EV To: Select General Motors Dealers This bulletin has been revised to add a required step for the Warranty Administrator to document the old and new battery BINs in the “Correction” field on the job card. Please discard all previous copies of N222380031. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2974 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6611 URGENT – DISTRIBUTE IMMEDIATELY Date: June 27, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6540 URGENT – DISTRIBUTE IMMEDIATELY Date: April 21, 2023 Subject: REVISION: N222380031-02 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack **IMPORTANT PARTS UPDATE** Models: 2022 GMC HUMMER EV To: All General Motors Dealers This bulletin has been revised to change one of the High Voltage Drive Motor Cable part numbers. Please verify the High Voltage Drive Motor Cable part number that was ordered or installed matches the new parts table provided in this bulletin. Please discard all previous copies of N222380031. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers when they will be ‘Open’ at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2922 REVISION: N222380031-03 – Safety Recall – High Voltage Battery Pack – **IMPORTANT PARTS UPDATE** GLOBAL SAFETY FIELD INVESTIGATIONS DCS6553 URGENT – DISTRIBUTE IMMEDIATELY Date: May 3, 2023 Subject: REVISION: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack **IMPORTANT PARTS UPDATE** Models: 2022 GMC HUMMER EV To: All General Motors Dealers This bulletin has been revised to update one of the High Voltage Drive Motor Cable part numbers. Please verify the High Voltage Drive Motor Cable part number that was ordered or installed matches the new parts table provided in this bulletin. Please discard all previous copies of N222380031-02. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers when they will be ‘Open’ at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6539 URGENT – DISTRIBUTE IMMEDIATELY Date: April 25, 2023 Subject: N222380031-02 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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Reference Number: GCUS-3-2978 N222380031-03 – Safety Recall – High Voltage Battery Pack – Additional VINs Moved to Open GLOBAL SAFETY FIELD INVESTIGATIONS DCS6616 URGENT – DISTRIBUTE IMMEDIATELY Date: June 30, 2023 Subject: N222380031-03 – Safety Recall Improper Urethane Sealing – High Voltage Battery Pack Additional vehicles have been moved to ‘Open’ status Models: 2022 GMC HUMMER EV To: All General Motors Dealers Additional 2022 model year HUMMER EV vehicles have been moved to ‘Open’ status in IVH and are now eligible for a high voltage battery pack replacement. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. This recall must only be completed by GMC EV certified dealers and repairs must be performed by a technician who has successfully completed the required EV training. In addition to meeting all hoist and forklift requirements as outlined in bulletin 22-NA-114, the Special Tools listed below are required to complete this repair. Dealers are NOT authorized to perform this recall until all required tools and equipment are acquired, including having a forklift onsite. Marketing Number Description EL-53000 HV Battery Support Fixture EL-53152 HV Battery Alignment Pins GE-47716 Vac-N-Fill Coolant Refill Tool EL-53076 Battery Pack Coolant Passage Pressure Adapter EL-53080 High Voltage Battery Pack Lifting System EL-53097 EV Battery Lifting Eye Bolts EL-39200-LEAD Electronic Test Leads Kit EL-48900-A HV Safety Kit EL-49642 SPS Programming Support Tool As VINs become eligible for final repair, they will be moved to ‘Open’ status in IVH. Remaining VINs in “Incomplete. Remedy Not Available” status will not be eligible for the final repair until GM informs dealers at a future date. An ‘Open’ status in IVH indicates the VIN is eligible for a HV Battery order. Once the HV Battery is received, it can only be installed in the vehicle for the VIN that was provided at the time the order was placed. No substitutions of VINS will be allowed. Carefully read this bulletin before beginning the remedy procedure. This bulletin contains important legal and safety requirements that must be followed to safely replace the vehicle’s high voltage battery in compliance with applicable federal, state, provincial, and local laws. To avoid injury or death, use of a forklift that meets the specifications outlined in bulletin 22-NA-114 is required to safely load and unload crated HV batteries into and out of delivery trucks. Failure to carefully follow the procedures in this bulletin may result in serious injury or death. Vehicles involved in this recall were placed on stop delivery October 13, 2022. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing Limited customer letter mailing began on April 13, 2023, and will continue as VINs become eligible for the final repair. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen was first updated on March 29, 2023. Please verify a VINs involvement in this field action by checking IVH prior to doing any repairs. IVH is the best source for individual VIN inquires. A list of vehicles moved to ‘Open” is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : APR 12, 2023 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 797 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 705 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 92 BrightDrop EV600 vehicles are affected by this recall. Production Dates : JAN 26, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : Dealers will replace high-voltage battery packs. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification mailed December 6 through December 8, 2022. Owner notification of an available remedy is expected mail in phases from April 28, 2023 through June 30, 2023. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : APR 28, 2023 – JUN 30, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : OCT 13, 2022 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 824 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 89 BrightDrop EV600 vehicles are affected by this recall. Production Dates : MAR 03, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2023 GMC Hummer Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 735 GMC Hummer vehicles are affected by this recall. Production Dates : NOV 09, 2021 – SEP 28, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : GM is working to develop a remedy for this condition. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification is estimated to begin on November 28, 2022. GM will provide an estimate for owner remedy notification when one is available. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : NOV 28, 2022 – NOV 28, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : JUL 12, 2023 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 797 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 92 BrightDrop EV600 vehicles are affected by this recall. Production Dates : JAN 26, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 705 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : Dealers will replace high-voltage battery packs. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification mailed December 6 through December 8, 2022. Owner notification of an available remedy is expected mail in phases from April 28, 2023 through August 18, 2023. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : APR 28, 2023 – AUG 18, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : OCT 25, 2022 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 795 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 87 BrightDrop EV600 vehicles are affected by this recall. Production Dates : MAR 03, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 698 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : GM is working to develop a remedy for this condition. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification is estimated to begin on November 28, 2022. GM will provide an estimate for owner remedy notification when one is available. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : NOV 28, 2022 – NOV 28, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : APR 12, 2023 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 797 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 705 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 92 BrightDrop EV600 vehicles are affected by this recall. Production Dates : JAN 26, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : Dealers will replace high-voltage battery packs. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification mailed December 6 through December 8, 2022. Owner notification of an available remedy is expected mail in phases from April 28, 2023 through June 30, 2023. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : APR 28, 2023 – JUN 30, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : JAN 26, 2023 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 797 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 705 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 92 BrightDrop EV600 vehicles are affected by this recall. Production Dates : JAN 26, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : Dealers will replace high-voltage battery packs. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification is estimated to begin on November 28, 2022. GM will provide an estimate for owner remedy notification when one is available. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : NOV 28, 2022 – NOV 28, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-771 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : MAR 16, 2023 NHTSA Recall No. : 22V-771 Manufacturer Recall No. : N222380031 Manufacturer Information : Manufacturer Name : General Motors, LLC Address : 29427 Louis Chevrolet Road MAIL CODE 480-210-2V WARREN MI 48093 Company phone : 586-596-1733 Population : Number of potentially involved : 797 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2022 BrightDrop EV600 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 92 BrightDrop EV600 vehicles are affected by this recall. Production Dates : JAN 26, 2022 – JUN 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2022-2023 GMC HUMMER EV Pickup Vehicle Type : Body Style : Power Train : NR Descriptive Information : Supplier shipping records and manufacturing records were used to determine the affected population. Vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall. 705 GMC Hummer vehicles are affected by this recall. Production Dates : SEP 28, 2021 – OCT 11, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-771 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2022 model year BrightDrop EV600 and 2022 to 2023 model year GMC Hummer vehicles. The high-voltage battery pack enclosure in some of these vehicles may not have been properly sealed. If the pack enclosure is not sealed, water can enter the pack. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : GM is aware of three confirmed reports of this condition causing water to enter the pack. In two of the cases, the vehicles would not start. In the third case, the vehicle lost propulsion while driving. A loss of propulsion while driving can increase the risk of a crash. Description of the Cause : Flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. Identification of Any Warning that can Occur : If water enters the battery pack enclosure and causes a battery pack malfunction, one or more malfunction indicator lamps may illuminate and the driver information center will display a warning message to the driver. Involved Components : Component Name 1 : BATTERY ASM-HIGH VLTG Component Description : High Voltage Battery Pack Assembly Component Part Number : 24048088, 24049061 Supplier Identification : Component Manufacturer Name : Magna International Inc Address : 1811 S. Range Rd. St. Clair Michigan 48079 Country : United States Chronology : On July 26, 2022 and August 9, 2022, GM received Speak Up For Safety (SUFS) submissions relating to potential electrocoating and urethane-sealing issues in certain Hummer EV battery packs. GM opened product investigations to investigate these related allegations on August 2, 2022 and August 19, 2022. GM’s Part 573 Safety Recall Report 22V-771 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 investigations identified two manufacturing errors—undercured electrocoating along certain portions of the battery tray and improper urethane seal repair—that could result in poor urethane seal adhesion in battery packs built during specific build windows. GM is aware of two relevant field reports and a relevant report involving a GM-owned test vehicle. In the two field reports, received by GM on June 27 and July 19, 2022, the vehicles would not start. In the third report, a GM-owned test vehicle lost propulsion during a test event at GM’s Milford Proving Grounds on September 24, 2022. All three of these vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly. Water inside the battery packs triggered the vehicles’ onboard diagnostics, and the drivers received notification of a battery-pack malfunction. GM is not aware of any accidents, injuries, or fires related to this condition. GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on vehicles containing packs with potentially improperly repaired urethane seals on October 6, 2022. SFADA decided to expand this recall to vehicles that may have battery pack trays with undercured electrocoating on October 13, 2022. Description of Remedy : Description of Remedy Program : Dealers will replace high-voltage battery packs. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Containment efforts to address undercured electrocoating were initiated at GM’s assembly plant and GM’s supplier on July 21, 2022. Corrections to the urethane seal repair procedure were implemented at GM’s supplier on August 10, 2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on October 13, 2022. Owner interim notification mailed December 6 through December 8, 2022. Owner notification of an available remedy is expected mail in phases from March 31, 2023 through June 30, 2023. Planned Dealer Notification Date : OCT 13, 2022 – OCT 13, 2022 Planned Owner Notification Date : MAR 31, 2023 – JUN 30, 2023 * NR – Not Reported

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