N232414720 Steering Gear Shaft Fracture – 2024 Chevrolet Silverado & GMC Sierra 2500 HD/3500 HD

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Safety Recall N232414720 Steering Gear Shaft Fracture Copyright 2023 General Motors. All Rights Reserved. Page 1 of 3 Release Date: August 2023 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. This bulletin contains an inspection procedure for both dealer inventory and customer vehicles. Vehicles (both dealer inventory and customer owned) that pass this inspection procedure should be closed using the “Inspect Only – Vehicle Passed Inspection (No Further Action Required)” labor code 9106931. It is estimated that a very small percentage of the involved vehicles will fail the inspection and require part replacement. Vehicles that do not pass the inspection must be held and not delivered to customers until the repair is completed. The bulletin will be updated when the remedy and required parts become available, at which time those vehicles can be repaired, closed, and delivered. All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until either the inspection or inspection and repair contained in this bulletin has been performed on the vehicle. Make Model Model Year From To RPO Description Chevrolet Silverado 2500 HD/3500 HD 2024 2024 GMC Sierra 2500 HD/3500 HD Involved vehicles are marked “Incomplete Remedy Not Available” 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 may exist in certain 2024 model year Chevrolet Silverado 2500/3500 and 2024 model year GMC Sierra 2500/3500 vehicles. In these vehicles, the steering gear shaft may contain a supplier manufacturing defect that may result in a fracture of the shaft that attaches to the steering (pitman) arm. If the steering gear shaft fractures and the steering arm becomes disconnected, the driver will be unable to steer the vehicle, increasing the risk of a crash. Correction Dealers will inspect the steering gear and replace if necessary. Parts It is estimated that a very small percentage of the involved vehicles will fail the inspection and require part replacement. For those vehicles that do not pass the inspection, the bulletin will be updated when the remedy and required parts become available, at which time those vehicles can be repaired. No parts are required for this inspection procedure. Warranty Information Labor Operation Description Labor Time Trans. Type Net Item 9106931 Inspect Only – Vehicle Passed Inspection (No Further Action Required) 0.3 ZFAT N/A 9106932 Inspect Only – Vehicle Did Not Pass Inspection and Will Require Repair – claim submission will not close field action 0.3 Service Procedure 1. Lift the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 2. Inspect the Steering Gear Pinion Shaft/Pitman arm nut to see if they are intact. Safety Recall N232414720 Steering Gear Shaft Fracture Page 2 of 3 6403296 • If the inspection determines that the steering gear does NOT need to be replaced (steering gear pinion shaft and nut are intact), no further action is required. 6403294 • If the steering gear pinion shaft is broken/sheared off, as shown above, vehicles must be held and not delivered to customers. The bulletin will be updated when the remedy and required parts become available, at which time those vehicles can be repaired, closed, and delivered. Safety Recall N232414720 Steering Gear Shaft Fracture Page 3 of 3 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. GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information. We Support Voluntary Technician Certification

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Reference Number: GCUS-3-2993 N232414720 – Safety Recall – Steering Gear Shaft Fracture GLOBAL SAFETY FIELD INVESTIGATIONS DCS6634 URGENT – DISTRIBUTE IMMEDIATELY Date: August 3, 2023 Subject: N232414720 – Safety Recall Steering Gear Shaft Fracture Models: 2024 Chevrolet Silverado 2500 HD/3500 HD 2024 GMC Sierra 2500 HD/3500 HD To: All General Motors Dealers General Motors is releasing Safety Recall N232414720 today. The total number of U.S. vehicles involved is approximately 4,027. Please see the attached bulletin for details. The parts needed to complete the required repair are not yet available. All VINs will be placed in Incomplete Remedy Not Available status. This bulletin contains an inspection procedure for both dealer inventory and customer vehicles. Vehicles (both dealer inventory and customer owned) that pass this inspection procedure should be closed using the “Inspect Only – Vehicle Passed Inspection (No Further Action Required)” labor code 9106931. It is estimated that a very small percentage of the involved vehicles will fail the inspection and require part replacement. Vehicles that do not pass the inspection must be held and not delivered to customers until the repair is completed. The bulletin will be updated when the remedy and required parts become available, at which time those vehicles can be repaired, closed, and delivered. Frequently Asked Questions Document (FAQs) Attached to this message you will find a document that addresses the most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated August 3, 2023. A list of vehicles in dealer inventory is attached to this message. END OF MESSAGE GLOBAL SAFETY FIELD INVESTIGATIONS

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-549 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : General Motors, LLC Submission Date : AUG 03, 2023 NHTSA Recall No. : 23V-549 Manufacturer Recall No. : N232414720 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 : 3,893 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2024-2024 Chevrolet Silverado 2500/3500 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records and part supplier shipping records were used to identify vehicles that may have received a steering gear shaft from the supplier’s suspect production period. Vehicles that were not built with a steering gear shaft from the supplier’s suspect production period are not part of this recall. There are 2005 Chevrolet Silverado 2500/3500 vehicles affected by this recall. Production Dates : JUN 07, 2023 – JUN 23, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 23V-549 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 2 : 2024-2024 GMC Sierra 2500/3500 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Manufacturing records and part supplier shipping records were used to identify vehicles that may have received a steering gear shaft from the supplier’s suspect production period. Vehicles that were not built with a steering gear shaft from the supplier’s suspect production period are not part of this recall. There are 1888 GMC Sierra 2500/3500 vehicles affected by this recall. Production Dates : JUN 07, 2023 – JUN 24, 2023 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 may exist in certain 2024 model year Chevrolet Silverado 2500/3500 and 2024 model year GMC Sierra 2500/3500 vehicles. In these vehicles, the steering gear shaft may contain a supplier manufacturing defect that may result in a fracture of the shaft that attaches to the steering (pitman) arm. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the steering gear shaft fractures and the steering arm becomes disconnected, the driver will be unable to steer the vehicle, increasing the risk of a crash. Description of the Cause : Certain steering gear shaft components may have been produced with out of specification material that was not properly heat treated by GM’s supplier. Identification of Any Warning that can Occur : NR Involved Components : Component Name 1 : GEAR ASM-HYD RECRG BALL STRG Component Description : Steering Gear Component Part Number : 86802095, 86802096, 86802097, 86802098, 86554125 Part 573 Safety Recall Report 23V-549 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Supplier Identification : Component Manufacturer Name : Nexteer Address : 3900 E Holland Rd Saginaw Michigan 48601-9494 Country : United States Chronology : On June 20, 2023, a GM quality engineer discovered a fractured steering gear shaft on a 2024 model year Chevrolet Silverado HD truck during an alignment operation and submitted a Speak Up For Safety (SUFS) report. On June 21, 2023, GM’s supplier determined that certain steering gear shaft parts may have been improperly heat treated. GM’s investigation determined that the use of out of specification material combined with improper heat treatment could result in steering gear shaft parts with material properties outside of specification, which may result in fracture of the shaft. GM is not aware of any field incidents related to this condition. On July 27, 2023, GM’s Safety and Field Action Decision Authority decided to conduct a safety recall. Description of Remedy : Description of Remedy Program : Dealers will inspect the steering gear and replace if necessary. Pursuant to 49 C.F.R. § 573.13(d)(1), all covered vehicles are under warranty, so reimbursement is not offered. How Remedy Component Differs from Recalled Component : The replacement steering gear was not produced during the supplier’s suspect time period. Identify How/When Recall Condition was Corrected in Production : Containment efforts were initiated at GM’s assembly plants on June 23, 2023, and at GM’s distribution center on June 27, 2023. Vehicles produced on or after June 24, 2023, did not include steering gears from the supplier’s suspect production period. Recall Schedule : Description of Recall Schedule : Dealers will be notified on August 3, 2023. Owner notification is estimated to begin on September 18, 2023. Planned Dealer Notification Date : AUG 03, 2023 – AUG 03, 2023 Planned Owner Notification Date : SEP 18, 2023 – SEP 18, 2023 Part 573 Safety Recall Report 23V-549 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 * NR – Not Reported

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