N222368230 Potential Brake Fluid Leak – 2022 Chevrolet Silverado MD 4500HD/5500HD/6500HD

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Product Safety Recall N222368230 Potential Brake Fluid Leak Copyright 2022 General Motors. All Rights Reserved. Page 1 of 4 Release Date: June 2022 Revision: 01 Revision Description: The customer letter has been added to this bulletin. Please discard all previous copies of bulletin N222368230. Attention: It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle. ONLY Chevrolet Medium Duty dealers can complete this recall repair. Make Model Model Year RPO Description From To Chevrolet Silverado MD 4500HD/5500HD/6500HD 2022 2022 Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs. Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2022 model year Chevrolet Medium Duty 4500HD/5500HD/6500HD vehicles. Navistar, the manufacturer of these vehicles, has determined that the pressure-sensor fitting of the primary hydraulic brake line assembly may not be tightened to the correct torque and could leak brake fluid. A brake fluid leak could lead to extended braking distances, increasing the risk of a crash. Correction Dealers will tighten the brake pressure switch to specification, bleed the brake system, and top-off the brake fluid. Parts Quantity Part Name Part No. 3 Brake Fluid 19353126 Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts to confirm RIM managed status. Parts may have quantity limiters in effect. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106229 Torque Brake Pressure Switch and Bleed Brake System 0.5 ZFAT N/A Product Safety Recall N222368230 Potential Brake Fluid Leak Page 2 of 4 Service Procedure 6081482 1. Locate the brake pressure switch next to the brake master cylinder as shown. 2. Disconnect the electrical connector. 3. Torque the brake pressure switch to 35 lb-ft (48 N-m). 4. Reconnect the electrical connector. 5. Bleed the brake system. Refer to Hydraulic Brake System Bleeding in SI. Dealer Responsibility – For USA & Export (USA States, Territories, and Possessions) It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably 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. Product Safety Recall N222368230 Potential Brake Fluid Leak Page 3 of 4 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 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. Customer Notification USA – General Motors will notify customers of this recall on their vehicle (see copy of customer letter included with this bulletin). GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information. We Support Voluntary Technician Certification Product Safety Recall N222368230 Potential Brake Fluid Leak Page 4 of 4 IMPORTANT SAFETY RECALL June 2022 This notice applies to your vehicle, VIN: _____________________________________ Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2022 model year Chevrolet Medium Duty 4500HD/5500HD/6500HD 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 N222368230. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? The pressure-sensor fitting of the primary hydraulic brake line assembly may not be tightened to the correct torque and could leak brake fluid. A brake fluid leak could lead to extended braking distances, increasing the risk of a crash. What will we do? Your GM dealer will tighten the brake pressure switch to specification, bleed the brake system, and top-off the brake fluid. 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 inspection and service correction time of approximately 35 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 any 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) Chevrolet 1-800-222-1020 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 22V364. 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: N222368230

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IMPORTANT SAFETY RECALL June 2022 This notice applies to your vehicle, VIN: _____________________________________ Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2022 model year Chevrolet Medium Duty 4500HD/5500HD/6500HD 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 N222368230. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? The pressure-sensor fitting of the primary hydraulic brake line assembly may not be tightened to the correct torque and could leak brake fluid. A brake fluid leak could lead to extended braking distances, increasing the risk of a crash. What will we do? Your GM dealer will tighten the brake pressure switch to specification, bleed the brake system, and top-off the brake fluid. 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 inspection and service correction time of approximately 35 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 any 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) Chevrolet 1-800-222-1020 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 22V364. 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: N222368230

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6187 URGENT – DISTRIBUTE IMMEDIATELY Date: June 13, 2022 Subject: N222368230-01 – Safety Recall Potential Brake Fluid Leak Customer Letter Added Models: 2022 Chevrolet Silverado MD 4500/5500/6500 To: All General Motors Medium Duty Dealers Bulletin N222368230-01 has been revised to include a copy of the customer notification letter. Please discard all copies of bulletin N222368230. Customer Letter Mailing The customer letter mailing will begin on June 23, 2022. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6170 URGENT – DISTRIBUTE IMMEDIATELY Date: May 20, 2022 Subject: N222368230 – Safety Recall Potential Brake Fluid Leak Models: 2022 Chevrolet Silverado MD 4500/5500/6500 To: All General Motors Medium Duty Dealers General Motors is releasing Safety Recall N222368230 today. The total number of U.S. vehicles involved is approximately 39. Please see the attached bulletin for details. Question and Answer Document (Q&A) Attached to this message you will find a document that addresses the nine most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Customer Letter Mailing The customer letter mailing will begin in June, 2022. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated May 20, 2022. 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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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-364 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : MAY 20, 2022 NHTSA Recall No. : 22V-364 Manufacturer Recall No. : N222368230 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 : 39 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2022-2022 Chevrolet 4500HD / 5500HD / 6500HD Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records were used to identify vehicles built within the affected build window. Other medium duty models and vehicles built outside of the affected build window are not affected. Production Dates : MAR 25, 2022 – APR 05, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2022 model year Chevrolet Medium Duty 4500HD/5500HD/6500HD vehicles. Navistar, the manufacturer of these vehicles, has determined that the pressure-sensor fitting of the primary hydraulic brake line assembly may not be tightened to the correct torque and could leak brake fluid. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : A brake fluid leak could lead to extended braking distances, increasing the risk of a crash. Description of the Cause : Navistar inadvertently omitted the torque specification from the hydraulic brake line assembly print provided to a supplier following a change to the assembly. Part 573 Safety Recall Report 22V-364 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : If brake fluid is lost, drivers may experience soft or low brake pedal feel and a brake warning light may illuminate. Brake fluid may be present on the ground or in the engine compartment. Involved Components : Component Name 1 : TUBE, PRIMARY, ASSY W/PRESSURE SW Component Description : Brake Tube Assembly with Pressure Switch Component Part Number : 4312257C91 Supplier Identification : Component Manufacturer Name : Navistrar, Inc. Address : 2701 Navistar Dr. Lisle Illinois 60532 Country : United States Chronology : On April 7, 2022, Navistar informed GM that several vehicles experienced soft brake pedal feel or extended stopping distance during assembly end-of-line testing, and that the brake pressure switch on these vehicles was not torqued to specification. GM opened a product investigation into this issue on April 12, 2022. On May 10, 2022, Navistar informed GM that Navistar intended to file a safety recall for this condition. On May 19, 2022, GM’s Safety and Field Action Decision Authority (SFADA) decided to conduct a safety recall on the GM-badged vehicles produced in the same suspect production period as the recalled Navistar vehicles. GM is not aware of any relevant field reports or crashes attributable to this condition. Description of Remedy : Description of Remedy Program : Dealers will tighten the brake pressure switch to specification, bleed the brake system, and top-off the brake fluid. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. Part 573 Safety Recall Report 22V-364 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Navistar initiated containment efforts on 04/07/2022. Recall Schedule : Description of Recall Schedule : Dealers will be notified on May 20, 2022. GM estimates owner notification will begin on July 05, 2022. Planned Dealer Notification Date : MAY 20, 2022 – MAY 20, 2022 Planned Owner Notification Date : JUL 05, 2022 – JUL 05, 2022 * NR – Not Reported

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