N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events – 2018-2020 Buick Regal

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IMPORTANT SAFETY RECALL August 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 certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” As a result, GM is conducting a 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 noncompliance recall N222370090. Why is your vehicle being recalled? Certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. What will we do? Software to repair your vehicle is not currently available, but when it is, your GM dealer will reflash the software in the electronic brake control module (EBCM).This service will be performed for you at no charge. We are working as quickly as possible to correct this condition. When software is available, we will send you another letter asking you to take your vehicle to your GM dealer to have your vehicle serviced. You can also check the status of this recall at: https://my.gm.com/recalls. If you have already paid for repairs for this condition, you may submit those charges using the reimbursement request form that will be provided with the next letter. Do you have questions? If you have questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer Assistance Center at the number listed below. Division Number Text Telephones (TTY) Buick 1-866-608-8080 1-800-832-8425 Puerto Rico – English 1-800-496-9992 Puerto Rico – Español 1-800-496-9993 Virgin Islands 1-800-496-9994 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 22V465. 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 Enclosure GM Recall: N222370090

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F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Copyright 2022 General Motors. All Rights Reserved. Page 1 of 8 Release Date: September 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. Vehicles involved in this recall were placed on stop delivery June 30, 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. Make Model Model Year RPO Description From To Buick Regal 2018 2020 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 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Correction Dealers will reflash the software in the electronic brake control module (EBCM). Parts No parts are required for this repair. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106319* Electronic Brake Control Module Configuration and Setup ONLY (Verified Software Level) 0.3 ZFAT N/A 9106320* Electronic Brake Control Module Reprogramming, Configuration and Setup with SPS 0.5 9106422 Working Capital Assistance Program Reimbursement – USED INVENTORY ONLY N/A ** Note: To avoid having to “H” route the WCAP transaction for approval, it must be submitted prior to the repair transaction. Important: * To avoid warranty transaction rejections, carefully read and follow the instructions below: • The Warranty Claim Code from the programming event 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 SPS2. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 2 of 8 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 SPS2 system as follows: 1. Open TLC on the computer used to program the vehicle. 2. Select and start 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. Working Capital Assistance Program (WCAP) Reimbursement – USED INVENTORY ONLY Note: USA & Canada Only – To avoid having to “H” route the WCAP transaction for approval, it must be submitted prior to the repair transaction. Important: The WCAP ZSET transaction labor code, 9800094, provided in the dealer message sent on July 15, 2022, must have been submitted prior to the submittal of the ZFAT transaction labor code or the claim will reject. ** USA & Canada Dealers Only – For vehicles eligible under the Working Capital Assistance Program, the amount should be submitted in Net Item/Miscellaneous. This amount has been calculated to a daily value for the days that the vehicle was in used dealer inventory and not available for sale. This reimbursement is limited to the number of days from the date of the stop sale/stop delivery order June 30, 2022 to the date the inspection or repair closed the recall bulletin. (not to exceed 65 days). Vehicle Working Capital Assistance Reimbursement Amount USA Canada 2018 Buick Regal $10.49 $12.46 2019 Buick Regal $11.24 $13.27 2020 Buick Regal $11.96 $14.02 Service Procedure Caution: Before downloading the update files, be sure the computer is connected to the internet through a network cable (hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming, programming failure or control module damage may occur. Note: Carefully read and follow the instructions below. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 3 of 8 • Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. 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. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger. • Follow the on-screen prompts regarding ignition power mode, but ensure that anything that drains excessive power (exterior lights, HVAC blower motor, etc) is off. • Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO. Important: The service technician always needs to verify that the VIN displayed in the TLC left side drop down menu and the top center window match the VIN plate of the vehicle to be programmed prior to using Service Programming System 2 (SPS2) for programming or reprogramming a module. • For the TLC application, service technicians need to always ensure that the power mode (ignition) is “ON” before reading the VIN from the vehicle’s VIN master module and that they do not select a VIN that is already in the TLC application memory from a previous vehicle. • If the VIN that shows up in the TLC top center window after correctly reading the VIN from the vehicle does not match the VIN plate of the vehicle, manually type in the VIN characters from the vehicle VIN plate into the TLC top center window and use these for programming or reprogramming the subject module with the correct vehicle VIN and software and/or calibrations. • The Engine Control Module (ECM) is the master module (for VIP vehicles) that TLC reads to determine the VIN of the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the ECM also needs to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate. • The Body Control Module (BCM) is the master module (for GEM vehicles) that TLC reads to determine the VIN of the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the BCM also needs to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate. Caution: Be sure the VIN selected in the drop down menu (1) is the same as the vehicle connected (2) before beginning programming. 5743643 Important: If the vehicle VIN DOES NOT match, the message below will be shown. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 4 of 8 5877000 5644477 Important: Techline Connect screens shown above. Important: If the same calibration/software warning is noted on the TLC Summary screen, select OK and follow screen instructions. After a successful programming event, the WCC is located in the Service Programming System dialogue box of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin. Note: Even if the module is up to date, continue to step 2 configuration and setup. 1. Reprogram the Electronic Brake Control Module. Refer to K17 Electronic Brake Control Module: Programming and Setup in SI. 2. Perform the “Configuration and Setup” on the Electronic Brake Control Module. Select “Configuration and Setup” on the SPS Supported Controllers screen and follow on screen instructions. Refer to K17 Electronic Brake Control Module: Programming and Setup in SI. 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. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 5 of 8 3. Record SPS Warranty Claim Code on job card for warranty transaction submission. 4. CALIFORNIA VEHICLES ONLY: Complete a “Proof of Correction” certificate and provide to the vehicle owner upon recall completion. 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. 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 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. Export – Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 6 of 8 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 F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 7 of 8 IMPORTANT SAFETY RECALL September 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. Previously, you were notified that your 2018-2020 model year Buick Regal was involved in GM recall N222370090. This letter is to inform you that parts are now available to repair your vehicle. General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” As a result, GM is conducting a 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 N222370090. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? Certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. What will we do? Your GM dealer will reflash the software in the electronic brake control module (EBCM).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 longer than the actual service correction time of approximately 25 minutes. What should you do? You should contact your GM dealer to arrange a service appointment as soon as possible. Do you have questions? If you have questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer Assistance Center at the number listed below. 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) Buick 1-800-521-7300 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 22V465. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. F/CMVSS Noncompliance Recall N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Page 8 of 8 Regina A. Carto Vice President Global Product Safety and Systems GM Recall: N222370090

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IMPORTANT SAFETY RECALL September 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. Previously, you were notified that your 2018-2020 model year Buick Regal was involved in GM recall N222370090. This letter is to inform you that parts are now available to repair your vehicle. General Motors has decided that certain 2018-2020 model year Buick Regal vehicles fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” As a result, GM is conducting a 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 recall N222370090. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? Certain 2018-2020 model year Buick Regal vehicles fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. What will we do? Your GM dealer will reflash the software in the electronic brake control module (EBCM).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 longer than the actual service correction time of approximately 25 minutes. What should you do? You should contact your GM dealer to arrange a service appointment as soon as possible. Do you have questions? If you have questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer Assistance Center at the number listed below. Division Number Text Telephones (TTY) Buick 1-866-608-8080 1-800-832-8425 Puerto Rico – English 1-800-496-9992 Puerto Rico – Español 1-800-496-9993 Virgin Islands 1-800-496-9994 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 22V465. 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: N222370090

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6269 URGENT – DISTRIBUTE IMMEDIATELY Date: September 01, 2022 Subject: N222370090 – Noncompliance Recall Increased Stopping Distance During Certain Brake Vacuum Loss Events Models: 2018-2020 Buick Regal To: All General Motors Dealers General Motors is releasing Noncompliance Recall N222370090 today. The total number of U.S. vehicles involved is approximately 23,734. Please see the attached bulletin for details. Vehicles involved in this recall were placed on stop delivery June 30, 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. 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 Noncompliance Recall. Please use this information as an aid to confidently answer customer concerns. Working Capital Assistance Program (WCAP) Eligibility Vehicles which were in dealer inventory at the time of this bulletin release were eligible for WCA. Please refer to the attached bulletin and GlobalConnect Message GCUS-9-9188 for additional information. Customer Letter Mailing The customer letter mailing will begin on September 16, 2022. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated September 01, 2022. A Stock VIN list is not included as our records show there are no vehicles in dealer new inventory. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GM CUSTOMER CARE AND AFTERSALES DCS6216 URGENT – DISTRIBUTE IMMEDIATELY Date: July 15, 2022 Subject: N222370090 – Noncompliance Recall Increased Stopping Distance During Certain Brake Vacuum Loss Events Application for Used Vehicle Working Capital Assistance Program (WCAP) Models: 2018 – 2020 Buick Regal To: All General Motors Dealers On June 30, 2022, GM sent to all GM dealers GlobalConnect Message GCUS-3-2567 regarding Noncompliance recall N222370090. The required repair to complete this recall is not yet available. Until further instructions are received, the 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 cannot be delivered to customers, dealer-traded, released to auction, used for demonstration purposes or put to any other use. This message is to inform dealers who have involved vehicles in their inventory that they can now apply for the used vehicle Working Capital Assistance Program (“WCAP”) for Non-Compliance recall N222370090. Before proceeding with the application process described below, dealers must verify vehicle eligibility based on the program terms and guidelines that were provided in GM GlobalConnect Message GCUS-9-10968 dated March 10, 2021. Applications submitted on ineligible vehicles are subject to chargeback of any incentives paid to the dealer under the WCAP. Because compensation and tracking requires visibility into dealers’ inventory, dealers must also have agreed to a Dealer Data Share agreement with GM in order to receive any compensation under this program. To apply for the WCAP for Noncompliance recall N222370090, dealers must access the GM Global Warranty Management (GWM) system and submit a “ZSET” warranty transaction using the labor code provided below for each eligible vehicle. This zero dollar special transaction type is the dealer’s application for compensation and constitutes a representation from the dealer that the vehicle is eligible for WCAP assistance. Note: Acceptance of the warranty transaction does not ensure vehicle eligibility or guarantee the provision of any assistance as defined by program terms and guidelines. Labor Code Description Labor Time Trans Code 9800094 Working Capital Assistance for Non-Compliance Recall N222370090 N/A ZSET To be eligible for the WCAP, a vehicle must be in dealer inventory at the time the related field action bulletin is released. If a vehicle has been delivered, wholesaled or otherwise disposed of prior to release of the bulletin, the vehicle is not eligible for assistance. Additionally, recalled vehicles taken in on trade may be eligible for assistance if the dealer immediately reports the vehicle in used vehicle inventory via its Dealer Management System (DMS) and makes application through the GWM system. To ensure that GM is receiving daily inventory information, which is necessary to process payments and make eligibility determinations under the WCAP, the dealer’s vehicles must be properly identified in the dealership’s DMS. A daily feed of this information is provided to GM through the Dealer Data Share (DDS) agreement. Beginning with the 1st quarter of 2019, all WCAP payments will be facilitated through the Global Warranty Management (GWM) system. For each eligible vehicle, a qualifying dealer will submit for WCAP vehicle enrollment with a “ZSET” transaction type and for reimbursement with a “ZFAT” transaction type both through the GWM system. If approved, a WCAP credit for that vehicle will be issued through the GWM system similar to any other warranty credit. WCAP submission instructions and the required labor code will also be provided in the appropriate field action bulletin. Each WCAP transaction being credited will be clearly identified on the dealer’s daily credit memo. In order to receive payment, a dealer must have timely reported the vehicle in used vehicle inventory, retained the vehicle until the related field action bulletin is released, and properly applied for the WCAP payment. The vehicle must also be otherwise eligible under WCAP rules and guidelines. GM reserves the right to amend, modify, terminate, or cancel this program at any time in its sole discretion. END OF MESSAGE GM CUSTOMER CARE AND AFTERSALES

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6205 URGENT – DISTRIBUTE IMMEDIATELY Date: June 30, 2022 Subject: Stop Delivery Order for Upcoming Noncompliance N222370090 Increased Stopping Distance During Certain Brake Vacuum Loss Events Models: 2018-2020 Buick Regal To: All General Motors Dealers STOP DELIVERY ORDER Effective immediately, stop the delivery of certain 2018-2020 model year Buick Regal vehicles in new or used vehicle inventory. General Motors has notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming noncompliance recall that involves these vehicles. The GM recall number is N222370090. 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 noncompliance is remedied. Certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” These vehicles may exceed the stopping distance prescribed by FMVSS 135, S7.11 for brake performance following loss of brake power assist. If, following the loss of brake power assist, the driver does not use additional effort to apply the brake pedal, the vehicle’s stopping distance may increase which could increase the risk of a crash. To correct this condition, dealers will reflash the software in the electronic brake control module (EBCM). 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/used 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 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. 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 Noncompliance 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 “N/A” under Release Date and “Incomplete – Remedy not yet 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, the recall bulletin will be released and dealers can begin repairing vehicles. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-465 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : AUG 03, 2022 NHTSA Recall No. : 22V-465 Manufacturer Recall No. : N222370090 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 : 23,734 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2020 Buick Regal Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to determine recall population. Other model years of the Buick Regal use a different design and are not affected by this recall. Production Dates : JUN 09, 2017 – JUL 01, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. FMVSS 1 : 135 – Light vehicle brake systems FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Description of the Cause : In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control Part 573 Safety Recall Report 22V-465 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 module (EBCM) may fail to activate the hydraulic-brake boost under these conditions. Identification of Any Warning that can Occur : In the event of a partial or full loss of vacuum-brake assist, the vehicle may display a message in the Driver Information Center, a malfunction warning light may illuminate, and the driver may notice increased pedal resistance. Involved Components : Component Name 1 : DATA FILE-ELEK BRK CONT MDL XML Component Description : Electronic Brake Control Module Software Component Part Number : 39135331, 39187211, 39187212, 39187213, 39215667, 39215668, 39215669 Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : On April 28, 2022, an issue was submitted to GM’s Speak Up For Safety (SUFS) program based on an Opel investigation of a potential brake-performance issue on the 2019 model year Opel Insignia, a sister vehicle to the Buick Regal. GM opened a formal investigation on May 6, 2022. GM’s supplier reviewed EBCM software files and determined that a software error in a file supplied by GM could cause the hydraulic-brake boost to fail to respond to a loss of brake-vacuum pressure. Tests conducted on a Buick Regal by GM on June 22 and June 23, 2022, showed that stopping distance following loss of vacuum brake pressure could exceed FMVSS 135 requirements by 1 to 5%. A review of field data identified four field claims received by GM between January 17, 2019 and March 22, 2022 in which the vehicle’s invalid vacuum pressure DTC (diagnostic trouble code) was set and the hydraulic brake boost was disabled. None of these claims involved an allegation that the condition contributed to a crash, and GM is not aware of any crashes or injuries relating to this condition. On June 23, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Part 573 Safety Recall Report 22V-465 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Dealers will reflash the software in the electronic brake control module (EBCM). Pursuant to 49 C.F.R. § 573.13(d)(2), General Motors does not plan to provide notice about reimbursement because a remedy for this condition was not previously available. How Remedy Component Differs from Recalled Component : The revised software activates the hydraulic brake boost if the vehicle suffers a loss of vacuum brake pressure. Identify How/When Recall Condition was Corrected in Production : A different design was used starting with the 2021 model year. Recall Schedule : Description of Recall Schedule : Dealers will be notified on June 30, 2022. Interim owner notification is estimated to begin on August 15, 2022. Owner notification of available remedy is expected to mail September 19, 2022. Planned Dealer Notification Date : JUN 30, 2022 – JUN 30, 2022 Planned Owner Notification Date : SEP 20, 2022 – SEP 20, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-465 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : JUN 30, 2022 NHTSA Recall No. : 22V-465 Manufacturer Recall No. : N222370090 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 : 23,734 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2020 Buick Regal Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to determine recall population. Other model years of the Buick Regal use a different design and are not affected by this recall. Production Dates : JUN 09, 2017 – JUL 01, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. FMVSS 1 : 135 – Light vehicle brake systems FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Description of the Cause : In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control Part 573 Safety Recall Report 22V-465 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 module (EBCM) may fail to activate the hydraulic-brake boost under these conditions. Identification of Any Warning that can Occur : In the event of a partial or full loss of vacuum-brake assist, the vehicle may display a message in the Driver Information Center, a malfunction warning light may illuminate, and the driver may notice increased pedal resistance. Involved Components : Component Name 1 : DATA FILE-ELEK BRK CONT MDL XML Component Description : Electronic Brake Control Module Software Component Part Number : 39135331, 39187211, 39187212, 39187213, 39215667, 39215668, 39215669 Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : On April 28, 2022, an issue was submitted to GM’s Speak Up For Safety (SUFS) program based on an Opel investigation of a potential brake-performance issue on the 2019 model year Opel Insignia, a sister vehicle to the Buick Regal. GM opened a formal investigation on May 6, 2022. GM’s supplier reviewed EBCM software files and determined that a software error in a file supplied by GM could cause the hydraulic-brake boost to fail to respond to a loss of brake-vacuum pressure. Tests conducted on a Buick Regal by GM on June 22 and June 23, 2022, showed that stopping distance following loss of vacuum brake pressure could exceed FMVSS 135 requirements by 1 to 5%. A review of field data identified four field claims received by GM between January 17, 2019 and March 22, 2022 in which the vehicle’s invalid vacuum pressure DTC (diagnostic trouble code) was set and the hydraulic brake boost was disabled. None of these claims involved an allegation that the condition contributed to a crash, and GM is not aware of any crashes or injuries relating to this condition. On June 23, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Part 573 Safety Recall Report 22V-465 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Dealers will reflash the software in the electronic brake control module (EBCM). Pursuant to 577.11, GM will provide reimbursement to owners for repairs according to the plan submitted on May 12, 2021. How Remedy Component Differs from Recalled Component : The revised software activates the hydraulic brake boost if the vehicle suffers a loss of vacuum brake pressure. Identify How/When Recall Condition was Corrected in Production : A different design was used starting with the 2021 model year. Recall Schedule : Description of Recall Schedule : Dealers will be notified on June 30, 2022. Owner notification is estimated to begin on August 15, 2022. Planned Dealer Notification Date : JUN 30, 2022 – JUN 30, 2022 Planned Owner Notification Date : AUG 15, 2022 – AUG 15, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-465 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : JUN 30, 2022 NHTSA Recall No. : 22V-465 Manufacturer Recall No. : N222370090 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 : 23,734 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2020 Buick Regal Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to determine recall population. Other model years of the Buick Regal use a different design and are not affected by this recall. Production Dates : JUN 09, 2017 – JUL 01, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. FMVSS 1 : 135 – Light vehicle brake systems FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Description of the Cause : In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control Part 573 Safety Recall Report 22V-465 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 module (EBCM) may fail to activate the hydraulic-brake boost under these conditions. Identification of Any Warning that can Occur : In the event of a partial or full loss of vacuum-brake assist, the vehicle may display a message in the Driver Information Center, a malfunction warning light may illuminate, and the driver may notice increased pedal resistance. Involved Components : Component Name 1 : DATA FILE-ELEK BRK CONT MDL XML Component Description : Electronic Brake Control Module Software Component Part Number : 39135331, 39187211, 39187212, 39187213, 39215667, 39215668, 39215669 Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : On April 28, 2022, an issue was submitted to GM’s Speak Up For Safety (SUFS) program based on an Opel investigation of a potential brake-performance issue on the 2019 model year Opel Insignia, a sister vehicle to the Buick Regal. GM opened a formal investigation on May 6, 2022. GM’s supplier reviewed EBCM software files and determined that a software error in a file supplied by GM could cause the hydraulic-brake boost to fail to respond to a loss of brake-vacuum pressure. Tests conducted on a Buick Regal by GM on June 22 and June 23, 2022, showed that stopping distance following loss of vacuum brake pressure could exceed FMVSS 135 requirements by 1 to 5%. A review of field data identified four field claims received by GM between January 17, 2019 and March 22, 2022 in which the vehicle’s invalid vacuum pressure DTC (diagnostic trouble code) was set and the hydraulic brake boost was disabled. None of these claims involved an allegation that the condition contributed to a crash, and GM is not aware of any crashes or injuries relating to this condition. On June 23, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Part 573 Safety Recall Report 22V-465 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Dealers will reflash the software in the electronic brake control module (EBCM). Pursuant to 577.11, GM will provide reimbursement to owners for repairs according to the plan submitted on May 12, 2021. How Remedy Component Differs from Recalled Component : The revised software activates the hydraulic brake boost if the vehicle suffers a loss of vacuum brake pressure. Identify How/When Recall Condition was Corrected in Production : A different design was used starting with the 2021 model year. Recall Schedule : Description of Recall Schedule : Dealers will be notified on June 30, 2022. Owner notification is estimated to begin on August 15, 2022. Planned Dealer Notification Date : JUN 30, 2022 – JUN 30, 2022 Planned Owner Notification Date : AUG 15, 2022 – AUG 15, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-465 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : AUG 02, 2022 NHTSA Recall No. : 22V-465 Manufacturer Recall No. : N222370090 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 : 23,734 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2020 Buick Regal Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to determine recall population. Other model years of the Buick Regal use a different design and are not affected by this recall. Production Dates : JUN 09, 2017 – JUL 01, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. FMVSS 1 : 135 – Light vehicle brake systems FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Description of the Cause : In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control Part 573 Safety Recall Report 22V-465 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 module (EBCM) may fail to activate the hydraulic-brake boost under these conditions. Identification of Any Warning that can Occur : In the event of a partial or full loss of vacuum-brake assist, the vehicle may display a message in the Driver Information Center, a malfunction warning light may illuminate, and the driver may notice increased pedal resistance. Involved Components : Component Name 1 : DATA FILE-ELEK BRK CONT MDL XML Component Description : Electronic Brake Control Module Software Component Part Number : 39135331, 39187211, 39187212, 39187213, 39215667, 39215668, 39215669 Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : On April 28, 2022, an issue was submitted to GM’s Speak Up For Safety (SUFS) program based on an Opel investigation of a potential brake-performance issue on the 2019 model year Opel Insignia, a sister vehicle to the Buick Regal. GM opened a formal investigation on May 6, 2022. GM’s supplier reviewed EBCM software files and determined that a software error in a file supplied by GM could cause the hydraulic-brake boost to fail to respond to a loss of brake-vacuum pressure. Tests conducted on a Buick Regal by GM on June 22 and June 23, 2022, showed that stopping distance following loss of vacuum brake pressure could exceed FMVSS 135 requirements by 1 to 5%. A review of field data identified four field claims received by GM between January 17, 2019 and March 22, 2022 in which the vehicle’s invalid vacuum pressure DTC (diagnostic trouble code) was set and the hydraulic brake boost was disabled. None of these claims involved an allegation that the condition contributed to a crash, and GM is not aware of any crashes or injuries relating to this condition. On June 23, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Part 573 Safety Recall Report 22V-465 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Dealers will reflash the software in the electronic brake control module (EBCM). Pursuant to 49 C.F.R. § 573.13(d)(2), General Motors does not plan to provide notice about reimbursement because a remedy for this condition was not previously available. How Remedy Component Differs from Recalled Component : The revised software activates the hydraulic brake boost if the vehicle suffers a loss of vacuum brake pressure. Identify How/When Recall Condition was Corrected in Production : A different design was used starting with the 2021 model year. Recall Schedule : Description of Recall Schedule : Dealers will be notified on June 30, 2022. Owner notification is estimated to begin on August 15, 2022. Planned Dealer Notification Date : JUN 30, 2022 – JUN 30, 2022 Planned Owner Notification Date : AUG 15, 2022 – AUG 15, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-465 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : JUN 30, 2022 NHTSA Recall No. : 22V-465 Manufacturer Recall No. : N222370090 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 : 23,734 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2020 Buick Regal Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to determine recall population. Other model years of the Buick Regal use a different design and are not affected by this recall. Production Dates : JUN 09, 2017 – JUL 01, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Description of Noncompliance : Description of the Noncompliance : General Motors has decided that certain 2018-2020 model year Buick Regal vehicles may fail to conform to S7.11 of Federal Motor Vehicle Safety Standard (FMVSS) No. 135, “Light vehicle brake systems.” Following a partial or full loss of vacuum-brake assist pressure, these vehicles may exceed the stopping-distance requirements in S7.11 of FMVSS 135. FMVSS 1 : 135 – Light vehicle brake systems FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake-pedal force applied by the driver. Increased stopping distances could increase the risk of a crash. Description of the Cause : In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control Part 573 Safety Recall Report 22V-465 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 module (EBCM) may fail to activate the hydraulic-brake boost under these conditions. Identification of Any Warning that can Occur : In the event of a partial or full loss of vacuum-brake assist, the vehicle may display a message in the Driver Information Center, a malfunction warning light may illuminate, and the driver may notice increased pedal resistance. Involved Components : Component Name 1 : DATA FILE-ELEK BRK CONT MDL XML Component Description : Electronic Brake Control Module Software Component Part Number : 39135331, 39187211, 39187212, 39187213, 39215667, 39215668, 39215669 Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : On April 28, 2022, an issue was submitted to GM’s Speak Up For Safety (SUFS) program based on an Opel investigation of a potential brake-performance issue on the 2019 model year Opel Insignia, a sister vehicle to the Buick Regal. GM opened a formal investigation on May 6, 2022. GM’s supplier reviewed EBCM software files and determined that a software error in a file supplied by GM could cause the hydraulic-brake boost to fail to respond to a loss of brake-vacuum pressure. Tests conducted on a Buick Regal by GM on June 22 and June 23, 2022, showed that stopping distance following loss of vacuum brake pressure could exceed FMVSS 135 requirements by 1 to 5%. A review of field data identified four field claims received by GM between January 17, 2019 and March 22, 2022 in which the vehicle’s invalid vacuum pressure DTC (diagnostic trouble code) was set and the hydraulic brake boost was disabled. None of these claims involved an allegation that the condition contributed to a crash, and GM is not aware of any crashes or injuries relating to this condition. On June 23, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a noncompliance recall. Part 573 Safety Recall Report 22V-465 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Dealers will reflash the software in the electronic brake control module (EBCM). Pursuant to 577.11, GM will provide reimbursement to owners for repairs according to the plan submitted on May 12, 2021. How Remedy Component Differs from Recalled Component : The revised software activates the hydraulic brake boost if the vehicle suffers a loss of vacuum brake pressure. Identify How/When Recall Condition was Corrected in Production : A different design was used starting with the 2021 model year. Recall Schedule : Description of Recall Schedule : Dealers will be notified on June 30, 2022. Owner notification is estimated to begin on August 15, 2022. Planned Dealer Notification Date : JUN 30, 2022 – JUN 30, 2022 Planned Owner Notification Date : AUG 15, 2022 – AUG 15, 2022 * NR – Not Reported

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