Steering Wheel Bolt May Loosen Affecting Steering – 2018-2021 Chevrolet 6500XD

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Chronology of Defect / Noncompliance Determination 573.6 (c) (6) (7) Describe the chronology of events leading up to the defect decision or test data for the noncompliance decision: (2000) In 2019, Isuzu conducted a safety recall to address field reports of loose steering stopper bolts in FTR model trucks. This recall, 19V-467, was launched in June 2019. The remedy in that recall was to clean the bolt, change the jam nut from a Grade 5 to Grade 8, apply Red Loctite 263 to the bolt, and reinstall with a higher torque specification. The same changes were adopted on the FTR production line in June 2019. In April 2021, Isuzu received the first field report of this condition in this model vehicle since launching the 2019 recall. The vehicle involved was one produced after the production line change that was made in June 2019. Isuzu continued to receive additional reports of loose left-side steering stopper bolts over the summer and early autumn of 2021. Some of these reports involved vehicles that had been remedied in the safety recall that launched in 2019, and some involved vehicles that were built after that safety recall. Isuzu started to collect parts from the field of failed and non-failed parts; all of the non-failed parts and most of the failed parts were from vehicles built after the recall countermeasure was introduced in the factory for newly produced vehicles. Isuzu studied these returned parts. Isuzu also conducted a study of varying amounts of Loctite applications on bolts with varying amounts of oil contamination. Isuzu concluded that, when the Loctite is installed in an adequate amount on a clean bolt, the Loctite application results in breakaway torques that exceed the material properties of the bolt, meaning that the bolt will not loosen. However, the breakaway torque varies with the amount of Loctite applied and the degree of cleanliness of the bolt at the time of the Loctite application. As a result of its detailed and thorough study of the returned parts, Isuzu concluded that the recall countermeasure (which was also introduced into production) was not sufficient to prevent the left-side steering stopper bolts from loosening. Isuzu believes that a combination of human errors in cleaning the bolt and in installing the Loctite caused these failures. Isuzu has received a total of 16 reports of a loose stopper bolt involving 14 unique VINs. Isuzu is not aware of any crashes or injuries associated with these reports. On 10/29/2021, Isuzu made a determination to conduct a safety recall to address the issue. Because the production change was identical to the recall remedy for recall 19V-467, and is now believed to be prone to the same risk of human error, Isuzu will recall all the vehicles included in recall 19V-467, as well as newer vehicles built after the recall countermeasure was introduced into production, for installation of the new Spiralock Nut. This means the vehicle population in this new recall will include all MY 2018 through 2021 FTR vehicles.

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IMPORTANT SAFETY RECALL January 2022 Dear General Motors Customer: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2018-2021 Chevrolet Low Cab Forward 6500XD Medium Duty vehicles. These vehicles are manufactured by Isuzu. As a result, GM is conducting a safety recall. IMPORTANT • Your vehicle is involved in GM safety recall N212353450. Why is your vehicle being recalled? The jam nut for the steering stopper bolt on the left side may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns, which could make it difficult to make sharp turns. If the vehicle’s turning radius is increased, there is an increased risk of a crash. (A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition.) We are working hard to secure replacement parts to repair your vehicle, as set forth below. Unfortunately, parts are not yet available. If you experience difficulty turning your vehicle to the left, please bring it to your dealer. Otherwise, GM will notify you once parts become available and ask you to bring your vehicle to your dealer at that time. What will we do? Parts to repair your vehicle are not currently available, but when parts are available, your Chevrolet dealer will replace both right and left side stopper bolt assemblies which include a newly designed jam nuts. GM will notify you once parts become available and ask you to bring your vehicle to your Chevrolet dealer at that time. This service will be performed free of charge. You can also check the status of this recall at: https://my.gm.com/recalls. What you should do In the meantime, take care when making left turns while driving. If you believe there is a problem, contact your dealer to schedule an appointment. Present this Owner Notification Letter at the time of your appointment. The dealer will check to determine if there is a problem with the stopper bolts. If the stopper bolt is determined to be the cause of your steering issue, the dealer will contact its Isuzu representative for further action prior to the recall remedy parts becoming available. Do you have questions? If you have any questions or concerns that your dealer is unable to resolve, please contact the General Motors Medium Duty Truck Customer Assistance Center at 1-800-862-4389. 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.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V861. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. GM Recall: N212353450

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Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Copyright 2022 General Motors. All Rights Reserved. Page 1 of 9 Release Date: March 2022 Revision: 00 Attention: It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. Vehicles involved in this recall were placed on stop delivery December 16, 2021. 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. ONLY Chevrolet Medium Duty dealers can complete this recall repair. Make Model Model Year RPO Description From To Chevrolet Low Cab Forward 6500XD 2018 2021 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 Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2018-2021 model year Chevrolet Low Cab Forward 6500XD medium duty truck vehicles. The jam nut for the steering stopper bolt on the left-front knuckle may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns. A change in turning radius could make it difficult to make sharp turns. A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition. If the vehicle’s turning radius is increased, there is an increased risk of a crash. Correction Dealers will replace both right and left side stopper bolt jam nuts with the new Spiralock Nut. The bolts and extensions will be cleaned and/or replaced as required. Parts Quantity Part Name Part No. 2 Steering Stop Bolt Kit 97840619 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 9106165 Replace Steering Stop Bolt Assemblies (Both Sides) Add: Alignment 0.9 0.4 ZFAT N/A 9106166 Floor Plan Reimbursement – NEW INVENTORY ONLY N/A ZFAT * 9106167 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. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 2 of 9 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 (December 16,2021) to the date the repair is completed, and the vehicle is ready for sale (not to exceed 87 days): Vehicle Floor Plan Reimbursement Amount USA 2018 Chevrolet Low Cab Forward 6500XD $4.91 2019 Chevrolet Low Cab Forward 6500XD $4.75 2020 Chevrolet Low Cab Forward 6500XD $5.54 2021 Chevrolet Low Cab Forward 6500XD $5.46 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, 9800083, provided in the dealer message sent on January 3, 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 (December 16, 2021) to the date the inspection or repair closed the recall bulletin. (not to exceed 87 days). Vehicle Working Capital Assistance Reimbursement Amount USA 2018 Chevrolet Low Cab Forward 6500XD $19.04 2019 Chevrolet Low Cab Forward 6500XD $20.25 2020 Chevrolet Low Cab Forward 6500XD $21.83 2021 Chevrolet Low Cab Forward 6500XD $23.17 Service Procedure 1. Apply the parking brake and block the rear wheels. 5360546 2. Start the engine and turn the steering wheel all the way to the left in order to access the right (passenger side) Stop Bolt Assembly. (See Figure 1.) Shut the engine off after turning the steering wheel. 3. Remove the Stop Bolt Assembly using a 1” deep well socket. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 3 of 9 5360555 4. Use an engineer’s ruler to measure the distance that the Stop Bolt protrudes out from the Adapter Base. Record this measurement. If the Stop Bolt and/or Jam Nut are loose, disregard this measurement. The steering angle will need to be set after completing the Stop Bolt replacement. • Remove and discard the old Stop Bolt Assembly. 5989395 5. Install the new Adapter Base (see Figure 3) using a 1” socket as shown in Figure 4. Tighten the Adapter Base to the specified torque. Tightening Torque: 190 N•m (140 lb ft). Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 4 of 9 5989398 6. Assemble the new Stop Bolt and Spiralock Nut (see Figure 3) into the Adapter Base installed in Step 5 as shown in Figure 5 and tighten the Spiralock Nut only hand tight. • If the Stop Bolt and Jam Nut were not found to be loose in Step 4, adjust the Stop Bolt until it is the same distance from the adaptor base measured and recorded in Step 4 (use a ½” open end wrench as necessary). When adjusted properly, snug the Spiralock Nut with a ¾” open wrench. Using a ¾” deep well socket and a torque wrench, tighten the Spiralock Nut to the specified torque. Proceed to Step 7. Tightening Torque: 165 N•m (122 lb ft). • If the Stop Bolt and Jam Nut were found to be loose in Step 4, use the TEMPLATE FOR STEERING BOLT ADJUSTMENT and perform the STEERING ANGLE ADJUSTMENT (Skip to Steps 11 through 18 in this bulletin). 7. Mark the Stop Bolt Assembly with white paint. 8. Start the engine and turn the steering wheel all the way to the right in order to access the left (driver side) Stop Bolt Assembly. (See Figure 1.) Shut the engine off after turning the steering wheel. 9. Repeat Steps 3 through 7 for the left (driver) side. 10. No further action is required. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 5 of 9 TEMPLATE FOR STEERING BOLT ADJUSTMENT5375525 Note: It is critical that the above templates be printed at 100% resolution on standard 8.5×11 letter paper, or the dimensions of the template may be incorrect. Print the above template for steering bolt adjustment. 11. Per the instructions in the owner’s manual or Service Information, safely tilt the cab and install the safety lock pin. 5375806 12. Press the template over the left (driver side) upper kingpin grease fitting at the mark indicated. Orientate the template as shown in Figure 6. Make sure the area on the template marked “Tire” is parallel with the tire as shown. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 6 of 9 5989396 13. Start the engine and turn the steering wheel in the opposite direction of the wheel/stop bolt being replaced. Continue to turn the steering wheel until the template installed in Step 11 is the same as in Figure 7. The 50° dashed line on the template should align parallel with the casting mark through the center of the axle. 5989399 14. Using a ½” open-end wrench, adjust the stop bolt until the stop bolt contacts firmly against the axle bolt stop. (See Figure 8.) Ensure the template is still in the position shown in Figure 7. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 7 of 9 5360564 15. Tighten the Stop Bolt Spiralock Nut with a ¾” open-end wrench. Start the engine and turn the steering wheel in the opposite direction to access the steering stop. Turn off the engine. Use a ¾” deep well socket and a torque wrench to tighten the Stop Bolt Spiralock Nut to the specified torque. (See Figure 9.) Tightening Torque: 165 N•m (122 lb ft). 16. Mark the Stop Bolt Assembly with white paint. 17. Remove the template from the kingpin grease fitting and discard. 18. Repeat Steps 12 through 17 for the right (passenger) side. 19. Per the instructions in the owner’s manual or Service Information, remove and properly stow the safety lock pin and tilt the cab back down. Ensure the cab is locked into place. 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. Product Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Page 8 of 9 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. 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 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 N212353450 Steering Knuckle Stopper Bolt Loose Page 9 of 9 IMPORTANT SAFETY RECALL March 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. Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2018-2021 model year Chevrolet Low Cab Forward 6500XD vehicles. These vehicles are manufactured by Isuzu. As a result, GM is conducting a safety recall. IMPORTANT • Your vehicle is involved in GM safety recall N212353450. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? The jam nut for the steering stopper bolt on the left side may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns, which could make it difficult to make sharp turns. If the vehicle’s turning radius is increased, there is an increased risk of a crash. (A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition.) What will we do? Your GM dealer will replace both right and left side stopper bolt assemblies which include newly designed jam nuts. 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 1 ½ hours. What should you do? You should contact your GM dealer to arrange a service appointment as soon as possible. When scheduling your appointment, confirm with the dealer that they service Medium Duty Trucks. 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) GM Medium Duty Truck 1-800-862-4389 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.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V861. 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: N212353450

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This is a representative letter. Customer letters are personalized and list specific model, model year and VIN. IMPORTANT SAFETY RECALL March 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. Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2018-2021 model year Chevrolet Low Cab Forward 6500XD vehicles. These vehicles are manufactured by Isuzu. As a result, GM is conducting a safety recall. IMPORTANT • Your vehicle is involved in GM safety recall N212353450. • Schedule an appointment with your GM dealer. • This service will be performed for you at no charge. Why is your vehicle being recalled? The jam nut for the steering stopper bolt on the left side may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns, which could make it difficult to make sharp turns. If the vehicle’s turning radius is increased, there is an increased risk of a crash. (A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition.) What will we do? Your GM dealer will replace both right and left side stopper bolt assemblies which include newly designed jam nuts. 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 1 ½ hours. What should you do? You should contact your GM dealer to arrange a service appointment as soon as possible. When scheduling your appointment, confirm with the dealer that they service Medium Duty Trucks. 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) GM Medium Duty Truck 1-800-862-4389 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.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V861. 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: N212353450

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GM CUSTOMER CARE AND AFTERSALES DCS6017 URGENT – DISTRIBUTE IMMEDIATELY Date: January 3, 2022 Subject: N212353450 – Safety Recall Steering Knuckle Stopper Bolt Loose Application for Used Vehicle Working Capital Assistance Program (WCAP) Models: 2018-2021 Chevrolet Low Cab Forward 6500XD Medium Duty Trucks To: All General Motors Medium Duty Dealers On December 16, 2021, GM sent to all GM dealers GlobalConnect Message GCUS-3-2382 regarding safety recall N212353450. 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 N212353450. 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 N212353450, 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 9800083 Working Capital Assistance for Safety Recall N212353450 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 DCS6074 URGENT – DISTRIBUTE IMMEDIATELY Date: March 10, 2022 Subject: N212353450 – Safety Recall Steering Knuckle Stopper Bolt Loose Models: 2018-2021 Chevrolet Low Cab Forward 6500XD To: All General Motors Medium Duty Dealers General Motors is releasing Safety Recall N212353450 today. The total number of U.S. vehicles involved is 387. Please see the attached bulletin for details. Vehicles involved in this recall were placed on stop delivery December 16, 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 March 24, 2022. Global Warranty Management (GWM) The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated March 10, 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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GLOBAL SAFETY FIELD INVESTIGATIONS DCS6005 URGENT – DISTRIBUTE IMMEDIATELY Date: December 16, 2021 Subject: Stop Delivery Order for Upcoming Safety Recall N212353450 Steering Knuckle Stopper Bolt Loose Models: 2018-2021 Chevrolet Low Cab Forward 6500XD Medium Duty Trucks To: All General Motors Medium Duty Dealers STOP DELIVERY ORDER Effective immediately, stop the delivery of certain 2018-2021 model year Chevrolet Low Cab Forward 6500XD MD vehicles in new or used vehicle inventory. Isuzu Motors Limited, the manufacturer of these vehicles, has notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming safety recall that involves these vehicles. The GM recall number is N212353450. 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. Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2018-2021 model year Chevrolet Low Cab Forward 6500XD medium duty truck vehicles. The jam nut for the steering stopper bolt on the left-front knuckle may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns. A change in turning radius could make it difficult to make sharp turns. A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition. If the vehicle’s turning radius is increased, there is an increased risk of a crash. To correct this condition, GM dealers will replace both right and left side stopper bolt jam nuts with the new Spiralock Nut. The bolts and extensions will be cleaned and/or replaced as required. 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 December 16, 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. 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 a sufficient quantity of parts 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 21V-861 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Isuzu Technical Center of America, Inc. Submission Date : NOV 05, 2021 NHTSA Recall No. : 21V-861 Manufacturer Recall No. : NR Manufacturer Information : Manufacturer Name : Isuzu Technical Center of America, Inc. Address : 46401 Commerce Center Drive Plymouth MI 48170-2473 Company phone : 866-441-9638 Population : Number of potentially involved : 5,700 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2021 ISUZU FTR Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The vehicle population begins with 2018 MY Start of Production. Population end date is the last date of production for each make 2021 MY vehicle. The new Spiralock nut was introduced into production at the start of production for the 2022 MY. Production Dates : MAY 08, 2017 – APR 19, 2021 VIN Range 1 : Begin : 54DK6S165JSG00023 End : 54DK6S167MSG70188 ✔ Not sequential Vehicle 2 : 2018-2021 Chevrolet 6500XD Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The vehicle population begins with 2018 MY Start of Production. Population end date is the last date of production for each make 2021 MY vehicle. The new Spiralock nut was introduced into production at the start of production for the 2022 MY. Production Dates : OCT 31, 2017 – SEP 18, 2020 VIN Range 1 : Begin : 54DKFS163JSG00926 End : 54DKFS165MSG50179 ✔ Not sequential Part 573 Safety Recall Report 21V-861 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : On certain vehicles, the jam nut for the steering stopper bolt on the left-front knuckle may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns. A change in turning radius could make it difficult to make sharp turns. A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s turning radius is increased, there is an increased risk of a crash. Description of the Cause : NR Identification of Any Warning that can Occur : Drivers experience difficulty turning the steering wheel fully to the left. Involved Components : Component Name 1 : Stop Bolt; Adapter Component Description : Steering stopper bolt assembly Component Part Number : 8983956790 Supplier Identification : Component Manufacturer Name : Dana Corporation Address : NR NR Country : NR Chronology : Provided chronology as uploaded document Part 573 Safety Recall Report 21V-861 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Isuzu dealers will replace both right and left side stopper bolt jam nuts with the new Spiralock Nut. The bolts and extensions will be cleaned and/ or replaced as required. / No reimbursement is anticipated as it is expected that all of the affected vehicles are still under warranty or subject to the prior recall (19V457). How Remedy Component Differs from Recalled Component : Unlike the recalled components and the remedy employed in the prior recall, the new remedy involves the addition of a Spiralock Nut and no longer requires the use of Loctite. Identify How/When Recall Condition was Corrected in Production : Production of the MY 21 FTR ended in April 2021. When production of the 22 MY FTR began in the week of October 4, 2021, the new stopper bolt assemblies (using the Spiralock Nut) were installed as standard equipment. Recall Schedule : Description of Recall Schedule : Isuzu and Chevrolet will notify their respective vehicle owners and dealers of this recall. Owners will be informed that the recall repairs will be done free of charge. The recall (owner notification) is expected to begin December 29, 2021. For additional information, Isuzu owners may contact Isuzu Customer Relations at 1-866-441-9638 and Chevrolet owners may contact the GM Medium Duty Truck assistance line at 1-800-862-4389. Planned Dealer Notification Date : NOV 05, 2021 – NOV 05, 2021 Planned Owner Notification Date : DEC 29, 2021 – JAN 04, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-861 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Isuzu Technical Center of America, Inc. Submission Date : NOV 23, 2021 NHTSA Recall No. : 21V-861 Manufacturer Recall No. : V2106 Manufacturer Information : Manufacturer Name : Isuzu Technical Center of America, Inc. Address : 46401 Commerce Center Drive Plymouth MI 48170-2473 Company phone : 866-441-9638 Population : Number of potentially involved : 5,700 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2018-2021 ISUZU FTR Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The vehicle population begins with 2018 MY Start of Production. Population end date is the last date of production for each make 2021 MY vehicle. The new Spiralock nut was introduced into production at the start of production for the 2022 MY. Production Dates : MAY 08, 2017 – APR 19, 2021 VIN Range 1 : Begin : 54DK6S165JSG00023 End : 54DK6S167MSG70188 ✔ Not sequential Vehicle 2 : 2018-2021 Chevrolet 6500XD Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The vehicle population begins with 2018 MY Start of Production. Population end date is the last date of production for each make 2021 MY vehicle. The new Spiralock nut was introduced into production at the start of production for the 2022 MY. Production Dates : OCT 31, 2017 – SEP 18, 2020 VIN Range 1 : Begin : 54DKFS163JSG00926 End : 54DKFS165MSG50179 ✔ Not sequential Part 573 Safety Recall Report 21V-861 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : On certain vehicles, the jam nut for the steering stopper bolt on the left-front knuckle may loosen and allow the bolt to back away from the steering knuckle. This could result in an increase in the turning radius of the vehicle in left turns. A change in turning radius could make it difficult to make sharp turns. A prior recall (19V467) was conducted to address this issue, but Isuzu has identified this condition on vehicles that were remedied in that campaign as well as those that were produced after a change in production intended to prevent the condition. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the vehicle’s turning radius is increased, there is an increased risk of a crash. Description of the Cause : NR Identification of Any Warning that can Occur : Drivers experience difficulty turning the steering wheel fully to the left. Involved Components : Component Name 1 : Stop Bolt; Adapter Component Description : Steering stopper bolt assembly Component Part Number : 8983956790 Supplier Identification : Component Manufacturer Name : Dana Corporation Address : Vía Monterrey-Matamoros 608 Paseo de las Flores Monterrey Foreign States 66626 Country : Mexico Chronology : Provided chronology as uploaded document. Part 573 Safety Recall Report 21V-861 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Isuzu dealers will replace both right and left side stopper bolt jam nuts with the new Spiralock Nut. The bolts and extensions will be cleaned and/ or replaced as required. / No reimbursement is anticipated as it is expected that all of the affected vehicles are still under warranty or subject to the prior recall (19V457). How Remedy Component Differs from Recalled Component : Unlike the recalled components and the remedy employed in the prior recall, the new remedy involves the addition of a Spiralock Nut and no longer requires the use of Loctite. Identify How/When Recall Condition was Corrected in Production : Production of the MY 21 FTR ended in April 2021. When production of the 22 MY FTR began in the week of October 4, 2021, the new stopper bolt assemblies (using the Spiralock Nut) were installed as standard equipment. Recall Schedule : Description of Recall Schedule : Isuzu and Chevrolet will notify their respective vehicle owners and dealers of this recall. Owners will be informed that the recall repairs will be done free of charge. The recall (owner notification) is expected to begin December 29, 2021. For additional information, Isuzu owners may contact Isuzu Customer Relations at 1-866-441-9638 and Chevrolet owners may contact the GM Medium Duty Truck assistance line at 1-800-862-4389. Planned Dealer Notification Date : NOV 05, 2021 – NOV 05, 2021 Planned Owner Notification Date : DEC 29, 2021 – JAN 04, 2022 * NR – Not Reported

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