2021 GMC Sierra Denali

1. Powertrain12 Feb 2026

   2026060

   Issue: On certain vehicles, the recall repairs completed by a General Motors dealer during recall N242454440 (Transport Canada recall no. 2024-637) may not have been done correctly. As a result, a second repair is required. Over time, the transmission control valve could wear and lose pressure. If this happens, the transmission could shift harshly and could cause the rear wheels to lock up. Note: This recall only affects vehicles equipped with a diesel engine. Safety Risk: Rear wheels that lock suddenly could cause a loss of control and increase the risk of a crash. Corrective Actions: General Motors will notify owners by mail and advise you to take your vehicle to a dealership to update the transmission control module software to detect excess wear in advance of a wheel lock up. If detected, a service engine light would turn on, a message would display in the instrument panel and the vehicle would be limited to fifth gear.

2. Engine24 Apr 2025

   2025225

   Issue: On certain vehicles, the connecting rods and/or crankshaft components may not have been manufactured properly. As a result, the engine could make abnormal noises and a warning light may turn on. If you continue to drive the vehicle with these symptoms, the engine could fail. Note: This recall only affects certain vehicles equipped with a 6.2 L V8 gas engine. Safety Risk: An engine failure could cause a sudden loss of power to the wheels and increase the risk of a crash. Corrective Actions: General Motors will notify owners by mail and advise you to take your vehicle to inspect and, if necessary, repair or replace the engine. For vehicles that pass the engine inspection, the dealer will replace the oil with a higher viscosity oil, install a new oil fill cap, replace the oil filter, and add an insert to the owner's manual.

3. Powertrain24 Oct 2024

   2024637

   Issue: Over time, the transmission control valve could wear and lose pressure. If this happens, the transmission could shift harshly and could cause the rear wheels to lock up. Note: This recall only affects vehicles equipped with a diesel engine. Safety Risk: Rear wheels that lock suddenly could cause a loss of control and increase the risk of a crash. Corrective Actions: General Motors will notify owners by mail and advise you to take your vehicle to a dealership to update the transmission control module software to detect excess wear in advance of a wheel lock up. If detected, a service engine light would turn on, a message would display in the instrument panel and the vehicle would be limited to fifth gear.

4. Structure1 Feb 2024

   2024061

   Issue: On certain trucks, water could leak into the exterior tailgate switch. As a result, the tailgate could unlatch and open unexpectedly while parked. If this happens, cargo that is not secured could fall out of the truck bed and onto the road when the vehicle is moving. Note: This recall only affects trucks equipped with a power-locking tailgate. Safety Risk: Cargo that falls from the truck bed could create a road hazard for others and increase the risk of a crash. Corrective Actions: General Motors will notify owners by mail and advise you to take your truck to a dealership to replace the exterior tailgate switch. To reduce the safety risk, General Motors recommends that you should inspect the tailgate to ensure it's closed and latched before driving.

5. Lights and instruments1 Feb 2024

   2024060

   Issue: On certain vehicles, a software problem could cause the lower beam headlamps not to turn on as it becomes dark outside if the multi-function switch is in the "OFF" or "PARKING LAMP" position. This could also cause the daytime running lamps (DRLs) to turn off when the vehicle is moving. As a result, the vehicles may not meet certain requirements of Canadian regulations. Safety Risk: Headlamps and/or DRLs that don't turn on could reduce visibility, make the vehicle less visible to others and increase the risk of a crash. Corrective Actions: General Motors will notify owners by mail and advise you to take your vehicle to a dealership to update the body control module (BCM)software.

6. Accessories31 Mar 2022

   2022160

   Issue: This recall is a new notification for owners that purchased a soft or hard tri-fold tonneau cover from a General Motors dealer. On certain trucks, the bed-cover could come loose while driving and detach from the truck. This problem affects soft and hard tri-fold tonneau covers that were sold as an accessory by General Motors dealers. Note: This recall is related to Transport Canada recalls 2019-494 and 2020-165. If your truck was previously repaired under either of those recalls, it does not require further repair under the new recall. Safety Risk: A tonneau cover that separates from a moving vehicle could create a hazard for other drivers and nearby people. Corrective Actions: General Motors will notify owners by mail and instruct you to take your truck to a dealer to perform the recall repairs, including adding a tether to prevent the tonneau cover from detaching. Note: Until the recall repairs are completed, you can prevent the chance of the tonneau cover detaching by removing it from your truck and storing it.

Listed for the model year, not checked against this VIN. Check this VIN with GMC Canada or ask a GMC dealer.

United States: 10 NHTSA records for the model year, kept apart.