FMVSS Noncompliance Recall N222359830 Taillamp Malfunction – 2022 GMC Hummer EV

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FMVSS Noncompliance Recall N222359830 Taillamp Malfunction Copyright 2022 General Motors. All Rights Reserved. Page 1 of 3 Release Date: March 2022 Revision: 00 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. 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. Please note, there are only 11 involved vehicles in the USA. The VINs are listed in the Service Procedure below. Make Model Model Year RPO Description From To GMC Hummer EV 2022 2022 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 certain 2022 model year GMC Hummer EV vehicles fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) No. 108, “Lamps, reflective devices, and associated equipment.” In these vehicles, embedded software in the taillamps can cause one or both rear taillamps to (a) become inoperative or (b) remain fully or partially illuminated. If the taillamp is inoperative, all taillamp functions (brake light, turn signal, backup lamp, side marker, clearance lamp, and tail light) will be disabled. If a taillamp remains fully or partially illuminated, some or all of these taillamp functions will remain activated at all times, even after the vehicle is turned off. A taillamp that fails to illuminate or illuminates incorrectly may reduce the visibility of the vehicle or communicate incorrect information to other road users, increasing the risk of a crash. Correction Dealers are to inspect and/or replace the left and or right taillamps. Parts Quantity Part Name Part No. 1 LAMP ASM-RR BODY STRUCTURE STOP 85547858 1 LAMP ASM-RR BODY STRUCTURE STOP 85547859 An initial supply of lamp asm were pre-shipped to involved dealers of record. This pre-shipment began and concluded the week of March 1, 2022. This will be approximately 100% of dealer’s involved vehicles in inventory, which is estimated that only 11 involved vehicles will require a new lamp asm. Due to the small number of vehicles anticipated that will need this fix and the limited initial parts availability, dealers are encouraged not to order these lamp asm for use as shelf stock. Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts to confirm RIM managed status. Parts may have quantity limiters in effect. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106192 Rear Body Structure Stop Lamp Inspection and/or Replacement (both sides) 1.2 ZFAT N/A FMVSS Noncompliance Recall N222359830 Taillamp Malfunction Page 2 of 3 Service Procedure VINS 1GT40FDA8NU100063 1GT40FDA3NU100150 1GT40FDA8NU100094 1GT40FDA2NU100012 1GT40FDA9NU100010 1GT40FDA8NU100001 1GT40FDAXNU100176 1GT40FDAXNU100095 1GT40FDA3NU100018 1GT40FDA7NU100006 1GT40FDAXNU100162 1. Remove the left and right rear body structure stop lamps (taillamp assembly). Refer to Rear Body Structure Stop Lamp Replacement in SI. 6001474 NOTE: There may be other yellow paint or crayon markings on the lamp housing in this area. These other markings do not affect this inspection. • If the lamp housing has a yellow paint stripe below the part number label, no further action is required. Reinstall the assembly. • If the lamp housing does not have a yellow paint stripe below the part number, replace the lamp assembly. 2. Reinstall the left and right rear body structure stop lamp (taillamp assembly). Refer to Rear Body Structure Stop Lamp Replacement in SI. 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 FMVSS Noncompliance Recall N222359830 Taillamp Malfunction Page 3 of 3 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. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. 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 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 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 General Motors will notify customers of this recall on their vehicle. 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

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6070 URGENT – DISTRIBUTE IMMEDIATELY Date: March 8, 2022 Subject: N222359830 – Noncompliance Recall Taillamp Malfunction Models: 2022 GMC Hummer EV To: Select General Motors Dealers General Motors is releasing Noncompliance Recall N222359830 today. The total number of U.S. vehicles involved is 11. Please see the attached bulletin for details. VIN BAC Dealer Name 1GT40FDA8NU100063 116555 SEWELL BUICK GMC 1GT40FDA3NU100150 317313 SUBURBAN BUICK GMC OF TROY 1GT40FDAXNU100162 317313 SUBURBAN BUICK GMC OF TROY 1GT40FDA8NU100094 113712 KOONS CHEVROLET 1GT40FDA2NU100012 118308 CENTURY BUICK GMC 1GT40FDA9NU100010 119157 CASA DE CADILLAC BUICK GMC SHERMAN OAKS 1GT40FDA8NU100001 162639 VAN CHEVROLET BUICK GMC 1GT40FDAXNU100176 178465 HENDRICK BUICK GMC CADILLAC 1GT40FDAXNU100095 275026 CAPITOL BUICK GMC 1GT40FDA3NU100018 276404 ALEXANDER BUICK GMC 1GT40FDA7NU100006 312483 SANTA MONICA BUICK GMC Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated March 8, 2022. Please hold all warranty transactions until IVH has been updated. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-141 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : MAR 10, 2022 NHTSA Recall No. : 22V-141 Manufacturer Recall No. : N222359830 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 : 10 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2022-2022 GMC Hummer EV Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to identify the affected population. Vehicles built with redesigned parts and vehicles corrected in containment are not included in this recall. Production Dates : OCT 05, 2021 – JAN 20, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2022 model year GMC Hummer EV vehicles fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) No. 108, “Lamps, reflective devices, and associated equipment.” In these vehicles, embedded software in the taillamps can cause one or both rear taillamps to (a) become inoperative or (b) remain fully or partially illuminated. If the taillamp is inoperative, all taillamp functions (brake light, turn signal, backup lamp, side marker, clearance lamp, and tail light) will be disabled. If a taillamp remains fully or partially illuminated, some or all of these taillamp functions will remain activated at all times, even after the vehicle is turned off. FMVSS 1 : 108 – Lamps, reflective devices, and assoc. Equipment FMVSS 2 : NR Description of the Safety Risk : A taillamp that fails to illuminate or illuminates incorrectly may reduce the visibility of the vehicle or communicate incorrect information to other road users, increasing the risk of a crash. Part 573 Safety Recall Report 22V-141 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Cause : Embedded software in the microcontroller in the taillamp assembly. Identification of Any Warning that can Occur : If a taillamp malfunctions, the driver may receive a “Check [Right/Left] Rear Turn Lamp” notification when attempting to activate the affected turn signal. Involved Components : Component Name 1 : LAMP ASM-RR BODY STRUCTURE STOP Component Description : Taillamp Assembly Component Part Number : 84810969, 84810970, 85528028, 85528029, 85547858, 85547859 Supplier Identification : Component Manufacturer Name : SL America Address : 278 Frank L. Diggs Drive Clinton Tennessee 37716 Country : United States Chronology : On February 1, 2022, a GM employee submitted a report to GM’s Speak Up For Safety (SUFS) program based on two field reports of malfunctioning taillamps on 2022 model year HUMMER EV vehicles. GM opened a product investigation on February 11, 2022. GM is aware of three confirmed field complaints of this condition. These complaints were received from January 8, 2022 through February 7, 2022. GM is not aware of any crashes caused by this condition. On March 3, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Description of Remedy : Description of Remedy Program : Dealers will inspect and, if necessary, replace left and/or right rear taillamp assemblies. 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 : Replacement taillamp assemblies have corrected embedded software in the microcontroller. Part 573 Safety Recall Report 22V-141 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Identify How/When Recall Condition was Corrected in Production : GM’s assembly plant initiated containment efforts on February 9, 2022. Vehicles with a build date after January 20, 2022, were built with parts containing corrected software or were repaired prior to shipment. Recall Schedule : Description of Recall Schedule : Dealers were notified on March 8, 2022. GM estimates owner notification will begin on April 25, 2022. Planned Dealer Notification Date : MAR 10, 2022 – MAR 10, 2022 Planned Owner Notification Date : APR 25, 2022 – APR 25, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-141 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : MAR 17, 2022 NHTSA Recall No. : 22V-141 Manufacturer Recall No. : N222359830 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 : 9 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2022-2022 GMC Hummer EV Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to identify the affected population. Vehicles built with redesigned parts and vehicles corrected in containment are not included in this recall. Production Dates : OCT 05, 2021 – JAN 20, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2022 model year GMC Hummer EV vehicles fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) No. 108, “Lamps, reflective devices, and associated equipment.” In these vehicles, embedded software in the taillamps can cause one or both rear taillamps to (a) become inoperative or (b) remain fully or partially illuminated. If the taillamp is inoperative, all taillamp functions (brake light, turn signal, backup lamp, side marker, clearance lamp, and tail light) will be disabled. If a taillamp remains fully or partially illuminated, some or all of these taillamp functions will remain activated at all times, even after the vehicle is turned off. FMVSS 1 : 108 – Lamps, reflective devices, and assoc. Equipment FMVSS 2 : NR Description of the Safety Risk : A taillamp that fails to illuminate or illuminates incorrectly may reduce the visibility of the vehicle or communicate incorrect information to other road users, increasing the risk of a crash. Part 573 Safety Recall Report 22V-141 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Cause : Embedded software in the microcontroller in the taillamp assembly. Identification of Any Warning that can Occur : If a taillamp malfunctions, the driver may receive a “Check [Right/Left] Rear Turn Lamp” notification when attempting to activate the affected turn signal. Involved Components : Component Name 1 : LAMP ASM-RR BODY STRUCTURE STOP Component Description : Taillamp Assembly Component Part Number : 84810969, 84810970, 85528028, 85528029, 85547858, 85547859 Supplier Identification : Component Manufacturer Name : SL America Address : 278 Frank L. Diggs Drive Clinton Tennessee 37716 Country : United States Chronology : On February 1, 2022, a GM employee submitted a report to GM’s Speak Up For Safety (SUFS) program based on two field reports of malfunctioning taillamps on 2022 model year HUMMER EV vehicles. GM opened a product investigation on February 11, 2022. GM is aware of three confirmed field complaints of this condition. These complaints were received from January 8, 2022 through February 7, 2022. GM is not aware of any crashes caused by this condition. On March 3, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Description of Remedy : Description of Remedy Program : Dealers will inspect and, if necessary, replace left and/or right rear taillamp assemblies. 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 : Replacement taillamp assemblies have corrected embedded software in the microcontroller. Part 573 Safety Recall Report 22V-141 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Identify How/When Recall Condition was Corrected in Production : GM’s assembly plant initiated containment efforts on February 9, 2022. Vehicles with a build date after January 20, 2022, were built with parts containing corrected software or were repaired prior to shipment. Recall Schedule : Description of Recall Schedule : Dealers were notified on March 8, 2022. GM estimates owner notification will begin on April 25, 2022. Planned Dealer Notification Date : MAR 10, 2022 – MAR 10, 2022 Planned Owner Notification Date : APR 25, 2022 – APR 25, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-141 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : MAR 22, 2022 NHTSA Recall No. : 22V-141 Manufacturer Recall No. : N222359830 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 : 9 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2022-2022 GMC Hummer EV Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to identify the affected population. Vehicles built with redesigned parts and vehicles corrected in containment are not included in this recall. Production Dates : OCT 05, 2021 – JAN 20, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2022 model year GMC Hummer EV vehicles fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) No. 108, “Lamps, reflective devices, and associated equipment.” In these vehicles, embedded software in the taillamps can cause one or both rear taillamps to (a) become inoperative or (b) remain fully or partially illuminated. If the taillamp is inoperative, all taillamp functions (brake light, turn signal, backup lamp, side marker, clearance lamp, and tail light) will be disabled. If a taillamp remains fully or partially illuminated, some or all of these taillamp functions will remain activated at all times, even after the vehicle is turned off. FMVSS 1 : 108 – Lamps, reflective devices, and assoc. Equipment FMVSS 2 : NR Description of the Safety Risk : A taillamp that fails to illuminate or illuminates incorrectly may reduce the visibility of the vehicle or communicate incorrect information to other road users, increasing the risk of a crash. Part 573 Safety Recall Report 22V-141 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Cause : Embedded software in the microcontroller in the taillamp assembly. Identification of Any Warning that can Occur : If a taillamp malfunctions, the driver may receive a “Check [Right/Left] Rear Turn Lamp” notification when attempting to activate the affected turn signal. Involved Components : Component Name 1 : LAMP ASM-RR BODY STRUCTURE STOP Component Description : Taillamp Assembly Component Part Number : 84810969, 84810970, 85528028, 85528029, 85547858, 85547859 Supplier Identification : Component Manufacturer Name : SL America Address : 278 Frank L. Diggs Drive Clinton Tennessee 37716 Country : United States Chronology : On February 1, 2022, a GM employee submitted a report to GM’s Speak Up For Safety (SUFS) program based on two field reports of malfunctioning taillamps on 2022 model year HUMMER EV vehicles. GM opened a product investigation on February 11, 2022. GM is aware of three confirmed field complaints of this condition. These complaints were received from January 8, 2022 through February 7, 2022. GM is not aware of any crashes caused by this condition. On March 3, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Description of Remedy : Description of Remedy Program : Dealers will inspect and, if necessary, replace left and/or right rear taillamp assemblies. 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 : Replacement taillamp assemblies have corrected embedded software in the microcontroller. Part 573 Safety Recall Report 22V-141 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Identify How/When Recall Condition was Corrected in Production : GM’s assembly plant initiated containment efforts on February 9, 2022. Vehicles with a build date after January 20, 2022, were built with parts containing corrected software or were repaired prior to shipment. Recall Schedule : Description of Recall Schedule : Dealers were notified on March 8, 2022. As of March 17, 2022, all nine vehicles have been remedied. Planned Dealer Notification Date : MAR 10, 2022 – MAR 10, 2022 Planned Owner Notification Date : MAR 17, 2022 – MAR 17, 2022 * NR – Not Reported

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