Safety Recall N212349181 Underhood Fire – 2021-2022 Chevrolet Silverado & GMC Sierra 2500/3500

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Find a Dealer Any Chevrolet, Buick, GMC or Cadillac dealer can make the Underhood Fire Safety Recall repair for FREE. Need Help? 1-866-467-9700 mycertifiedservice.com/locate-a-dealer Safety Risk Water may become trapped in the brake pressure modulator valve (BPMV) which could result in a short circuit and lead to an underhood fire. Call Your Dealer The Recall Repair Is FREE Your GM dealer will replace the brake pressure modulator valve (BPMV) assembly for FREE. URGENT Underhood Fire Safety Recall FREE Important Dear [FName], Our records, which are based primarily on state registration and title data, indicate that you are the registered owner of a [Model Year1] [MAKE1] [MODEL1], which is affected by the Underhood Fire Safety Recall. Our records indicate that your vehicle has not been repaired for this recall. General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2021–2022 model year Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and strive for your continued satisfaction with our products. It is important to contact your dealer to schedule your FREE recall repair appointment. Why is your vehicle being recalled? Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. What will we do? Your GM dealer will replace the brake pressure modulator valve (BPMV) assembly. 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 2 ½ hours. What should you do? Contact your GM dealer to schedule your FREE recall repair as soon as possible. It is recommended that the vehicle be parked outside and not in a garage or other structure until your recall repair is complete. Questions? If you have questions or concerns that your dealer is unable to resolve, please call 1-866-467-9700. Sincerely, Regina Carto Vice President, Global Product Safety & Systems This notice applies to your [Model Year1] [MAKE1] [MODEL1] VIN: [VIN1] Recall #212349181 [DEALER_NAME] [DEALER_NAME] [DEALER_ADDRESS1] [DEALER_ADDRESS1] [DEALER_CITY], [DEALER_STATE_PROV], [DEALER_POSTAL_CODE] [DEALER_SERVICE_PHONE] ©2022 General Motors. All Rights Reserved. [Date] [Unique_ID] [Creative_Code] V Buscar un concesionario Cualquier concesionario Chevrolet, Buick, GMC o Cadillac puede realizar la reparación de la Llamada a revisión de seguridad por incendio debajo del cofre de manera GRATUITA. ¿Necesita ayuda? 1-866-467-9700 mycertifiedservice.com/locate-a-dealer Riesgo de seguridad Si entra agua, puede quedar atrapada en la válvula moduladora de presión de freno (BPMV), lo cual podría ocasionar un cortocircuito y esto a su vez podría provocar un incendio debajo del cofre. Llame a su concesionario La reparación de la llamada a revisión es GRATUITA Su concesionario GM reemplazará el ensamble de la válvula moduladora de presión de freno (BPMV) de manera GRATUITA. URGENT Llamada a revisión de seguridad por incendio debajo del cofre FREE Importante Estimado [FName], Según nuestros archivos, basados principalmente en datos de matrículas y títulos estatales, usted es el propietario registrado de un [Model Year1] [MAKE1] [MODEL1], el cual está incluido en la Llamada a revisión de seguridad por incendio debajo del cofre. Nuestros registros indican que su vehículo no ha sido reparado en respuesta a esta llamada a revisión. General Motors ha determinado que existe un defecto que se relaciona con la seguridad de los vehículos de motor, en ciertos vehículos Chevrolet Silverado 2500/3500 y GMC Sierra 2500/3500 año de modelo 2021– 2022. En consecuencia, GM está realizando una llamada a revisión de seguridad. Le rogamos disculpe este inconveniente. Sin embargo, nos preocupa su seguridad y nos esforzamos por garantizar su satisfacción constante con nuestros productos. Por ello es importante que se ponga en contacto con su concesionario para programar su cita de reparación de la llamada a revisión GRATUITA. ¿Por qué se está llamando a revisión a su vehículo? Los pernos que sujetan el ensamble de la válvula moduladora de presión de freno (BPMV) en estos vehículos posiblemente no hayan sido apretados de manera adecuada, razón por la que no se crea el sello entre dos subensambles cuya finalidad es evitar la entrada de agua. Si entra agua y se queda atrapada en la BPMV, podría ocasionar un cortocircuito que a su vez podría provocar un incendio debajo del cofre. ¿Qué haremos nosotros? Su concesionario GM reemplazará el ensamble de la válvula moduladora de presión de freno (BPMV). Este servicio se realizará para usted sin cargo. Por cuestiones de programación del servicio, es probable que el concesionario necesite tener el vehículo un tiempo más prolongado que el tiempo real del servicio de corrección, que es de aproximadamente 2 ½ horas. ¿Qué debe hacer usted? Póngase en contacto con su concesionario GM para programar su reparación de la llamada a revisión GRATUITA lo antes posible. Se recomienda estacionar el vehículo en el exterior y no dentro de un garaje u otra estructura hasta que se realice su reparación de la llamada a revisión. ¿Dudas? Si tiene preguntas o dudas que no pueda resolver su concesionario, por favor llame al 1-866-467-9700. Atentamente, Regina Carto Vicepresidente, Seguridad del Producto y Sistemas Global Este aviso aplica para su [Model Year1] [MAKE1] [MODEL1] VIN: [VIN1] Llamada a revisión #212349181 [DEALER_NAME] [DEALER_NAME] [DEALER_ADDRESS1] [DEALER_ADDRESS1] [DEALER_CITY], [DEALER_STATE_PROV], [DEALER_POSTAL_CODE] [DEALER_SERVICE_PHONE] ©2022 General Motors. Todos los derechos reservados. [Date] [Unique_ID] [Creative_Code] V Important Underhood Fire Safety Recall Notice Aviso importante sobre Llamada a revisión de seguridad por incendio debajo del cofre GM Vehicle Safety PO Box 3047 Milwaukee, WI 53201 PRESORTED FIRST-CLASS MAIL U.S. POSTAGE PAID GENERAL MOTORS HDPU1-22 ***************AUTO**MIXED AADC 450 99999999999999 [Unique_ID] [Creative_Code] CV-011676 [FName] [LName] [Business_Name] [Address] [Address2] [City], [State] [Zip] FPO

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Product Safety Recall N212349181 Underhood Fire Copyright 2021 General Motors. All Rights Reserved. Page 1 of 4 Release Date: October 2021 Revision: 01 Revision Description: This bulletin has been revised to add a warning statement to the service procedure and additional instructions before replacing the EBCM/BPMV. Please discard all copies of bulletin N212349181. 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. 2021 model year vehicles involved in this recall were placed on stop delivery September 14, 2021, and 2022 model year vehicles on September 23, 2021 under N212349180. These VINs have been closed and moved to N212349181. 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 From To RPO Description Chevrolet Silverado 2500/3500 2021 2022 GMC Sierra 2500/3500 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 2021 – 2022 model year Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 vehicles. Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. Correction Dealers will replace the brake pressure modulator valve (BPMV) assembly. Parts Quantity Part Name Part No. 1 Electronic Brake Control Module and Brake Pressure Modulator Valve kit 85107552 2 Brake Fluid 19299570(US) 19299571(CA) Obtain locally in compliance w/GM Material Specification GMW3356 same as 9986356 (all other countries) Important: Due to limited initial parts availability, dealers are encouraged not to order these parts for use as shelf stock. Parts required to complete this recall are to be obtained from General Motors Customer Care and Aftersales (GMCCA). Order parts on a CSO, any orders placed as a DRO may cancel. Parts may also have quantity limiters in effect. 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. Product Safety Recall N212349181 Underhood Fire Page 2 of 4 Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9105998 Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement – Includes Brake Bleeding 2.4 ZFAT N/A 9105999 Floor Plan Reimbursement – NEW INVENTORY ONLY N/A ZFAT * 9106003 Working Capital Assistance Program Reimbursement – USED INVENTORY ONLY N/A ZFAT ** Note: To avoid having to “H” route the floor plan/WCAP transaction for approval, it must be submitted prior to the repair transaction. Floor Plan Reimbursement – NEW INVENTORY ONLY * USA & Canada 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 (September 14, 2021, September 23, 2021 and update September 29, 2021) to the date the repair is completed, and the vehicle is ready for sale (not to exceed 34 days): Vehicle Floor Plan Reimbursement Amount USA Canada 2021 Chevrolet Silverado 2500/3500 $6.88 $10.37 2022 Chevrolet Silverado 2500/3500 $6.56 $10.52 2021 GMC Sierra 2500/3500 $8.12 $11.43 2022 GMC Sierra 2500/3500 $8.01 N/A 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, 9800080, provided in the dealer message sent on September 30, 2021 (USA and Canada), 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 (September 14, 2021, September 23, 2021 and update September 29, 2021) to the date the repair closed the recall bulletin. (not to exceed 34 days). Vehicle Working Capital Assistance Reimbursement Amount USA Canada 2021 Chevrolet Silverado 2500/3500 $30.07 $43.17 2021 GMC Sierra 2500/3500 $29.40 $42.98 Service Procedure Warning: The brake system will be under pressure initially when performing this repair. Be sure to use safety glasses when cracking the lines open and follow all appropriate safety guidelines. Replace the Electronic Brake Control Module (EBCM) and Brake Pressure Modulator Valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement in SI. • Before replacing the EBCM/BPMV, lightly apply the brake pedal using a suitable tool to prevent the brake fluid reservoir from draining during the repair. 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. Product Safety Recall N212349181 Underhood Fire Page 3 of 4 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. 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 – 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). Export – Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. 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 N212349181 Underhood Fire Page 4 of 4 IMPORTANT SAFETY RECALL October 2021 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 2021-2022 model year Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 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. I M P O R T A N T • Your vehicle is involved in GM safety recall N212349181. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. What will we do? Your GM dealer will replace the brake pressure modulator valve (BPMV) assembly. 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 2 ½ hours. What should you do? It is recommended that the vehicle be parked outside and not in a garage or other structure until it is repaired. 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) Chevrolet 1-800-630-2438 1-800-833-2438 GMC 1-866-996-9463 1-800-462-8583 Puerto Rico – English 1-800-496-9992 Puerto Rico – Español 1-800-496-9993 Virgin Islands 1-800-496-9994 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 https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V758. 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: N212349181

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IMPORTANT SAFETY RECALL October 2021 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 2021-2022 model year Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 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 N212349181. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. What will we do? Your GM dealer will replace the brake pressure modulator valve (BPMV) assembly. 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 2 ½ hours. What should you do? It is recommended that the vehicle be parked outside and not in a garage or other structure until it is repaired. 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) Chevrolet 1-800-630-2438 1-800-833-2438 GMC 1-866-996-9463 1-800-462-8583 Puerto Rico – English 1-800-496-9992 Puerto Rico – Español 1-800-496-9993 Virgin Islands 1-800-496-9994 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 https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V758. 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: N212349181

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GM CUSTOMER CARE AND AFTERSALES DCS5947 URGENT – DISTRIBUTE IMMEDIATELY Date: September 30, 2021 Subject: N212349181 – Safety Recall Underhood Fire Application for Used Vehicle Working Capital Assistance Program (WCAP) Models: 2021-2022 Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 To: All General Motors Dealers On September 29, 2021, GM sent to all GM dealers GlobalConnect Message GCUS-3-2326 regarding safety recall N212349181. 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 safety recall N212349181. 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 safety recall N212349181, 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 9800080 Working Capital Assistance for Safety Recall N212349181 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 DCS5952 URGENT – DISTRIBUTE IMMEDIATELY Date: October 4, 2021 Subject: Updated FAQs for Stop Delivery Order for Upcoming Safety Recall N212349181 Underhood Fire Models: 2021-2022 Chevrolet Silverado 2500/3500 2021-2022 GMC Sierra 2500/3500 To: All General Motors Dealers STOP DELIVERY ORDER UPDATE On September 29, 2021, GM sent to all dealers GlobalConnect Message GCUS-3-2326 advising that General Motors had notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming safety recall that involves certain 2021-2022 model year Chevrolet Silverado 2500/3500 and Sierra 2500/3500 vehicles. We also advised that the stop delivery is continued, and the population expanded to include certain customer vehicles. Question #8 in the FAQs have been updated and are attached to this message. 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. Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. To correct this condition, dealers will replace the brake pressure modulator valve (BPMV) assembly. 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. 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. If you did not perform the below procedure when the stop delivery was initially ordered, please perform it at this time for vehicles that are in your inventory using the below labor code. Submittal of this will NOT close it out of IVH. Service Procedure IMPORTANT: Disconnect the negative battery cable from the battery and, if equipped, disconnect the negative battery from the auxiliary battery. Refer to Battery Negative Cable Disconnection and Connection (Single Battery) or Battery Negative Cable Disconnection and Connection (Dual Battery) in Service Information. Do NOT connect the negative battery cable and drive the vehicle until you receive the final remedy and lift stop sale message. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106002 Disconnect Negative Battery Cable 0.2 ZFAT N/A 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 with the supplier to obtain the required parts as quickly as possible. When 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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GLOBAL SAFETY FIELD INVESTIGATIONS DCS5945 URGENT – DISTRIBUTE IMMEDIATELY Date: September 29, 2021 Subject: Update for Stop Delivery Order for Upcoming Safety Recall N212349181 Underhood Fire Models: 2021-2022 Chevrolet Silverado 2500/3500 2021-2022 GMC Sierra 2500/3500 To: All General Motors Dealers STOP DELIVERY ORDER UPDATE On September 23, 2021, GM sent to all dealers GlobalConnect Message GCUS-3-2321 with an update, adding 4 additional VINs to the original stop sale which was issued on September 14, 2021. Effective immediately, the stop delivery is continued. The population has also been expanded to include certain customer vehicles. VINs that were in N212349180 have been moved to N212349181. General Motors has notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming safety recall that involve certain 2021-2022 model year Chevrolet Silverado 2500/3500 and Sierra 2500/3500 vehicles. The GM recall number is N212349181. 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. Bolts that attach the brake pressure modulator valve (BPMV) assembly in these vehicles may not have been properly tightened, failing to create the seal between two sub-assemblies that is intended to prevent water intrusion. If water becomes trapped in the BPMV, it could result in a short circuit, which could lead to an underhood fire. To correct this condition, dealers will replace the brake pressure modulator valve (BPMV) assembly. 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 will be updated for this upcoming recall on September 29, 2021. 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. If you did not perform the below procedure when the stop delivery was initially ordered, please perform it at this time for vehicles that are in your inventory using the below labor code. Submittal of this will NOT close it out of IVH. Service Procedure IMPORTANT: Disconnect the negative battery cable from the battery and, if equipped, disconnect the negative battery from the auxiliary battery. Refer to Battery Negative Cable Disconnection and Connection (Single Battery) or Battery Negative Cable Disconnection and Connection (Dual Battery) in Service Information. Do NOT connect the negative battery cable and drive the vehicle until you receive the final remedy and lift stop sale message. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106002 Disconnect Negative Battery Cable 0.2 ZFAT N/A 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 “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 with the supplier to obtain the required parts as quickly as possible. When 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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GLOBAL SAFETY FIELD INVESTIGATIONS DCS5961 URGENT – DISTRIBUTE IMMEDIATELY Date: October 13, 2021 Subject: N212349181 – Safety Recall Underhood Fire Models: 2021-2022 Chevrolet Silverado 2500/3500 2021-2022 GMC Sierra 2500/3500 To: All General Motors Dealers General Motors is releasing Safety Recall N212349181 today. The total number of U.S. vehicles involved is approximately 3,267. Please see the attached bulletin for details. Vehicles involved in this recall were placed on stop delivery September 14, 2021. 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 Safety 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 October 20, 2021. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated October 13, 2021. A list of involved vehicles in dealer new inventory is attached to this message. Please hold all warranty transactions until IVH has been updated. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS5977 URGENT – DISTRIBUTE IMMEDIATELY Date: October 27, 2021 Subject: A212335470-02 – Safety Mispositioned Emergency Jack May Not Support Vehicle Models: 2020 – 2022 Buick Encore GX 2021 – 2022 Chevrolet Trailblazer To: All General Motors Dealers General Motors is releasing a revision to Safety Recall Program A212335470 today. The total number of U.S. vehicles involved is approximately 135,400. Please see the attached bulletin for details. Customer Letter Mailing The customer letter mailing will begin on November 12, 2021. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated October 27, 2021. Please verify a VIN’s involvement in this field action by checking in IVH prior to doing any repairs. Please hold all warranty transactions until IVH has been updated. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GM CUSTOMER CARE AND AFTERSALES DCS5972 URGENT – DISTRIBUTE IMMEDIATELY Date: October 22, 2021 Subject: N212349181 01 – Safety Recall – Recall Reinstated Underhood Fire Models: 2021-2022 Chevrolet Silverado 2500/3500 2021-2022 GMC Sierra 2500/3500 To: All General Motors Dealers On October 21, 2021, we temporarily suspended Safety Recall N212349181 via GM GlobalConnect Message GCUS-3-2347. We are pleased to announce that this has been reinstated and dealers can resume repairing vehicles. This bulletin has also been revised to add a warning statement to the service procedure and additional instructions before replacing the EBCM/BPMV. Please discard all copies of bulletin N212349181. Involved vehicle status in IVH will be changed back to an Open status on October 22, 2021. We apologize for any inconvenience this situation may have caused. GM CUSTOMER CARE AND AFTERSALES

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