2021 GMC Sierra Recall

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.

Rear wheels that lock suddenly could cause a loss of control and increase the risk of a crash.

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.

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.

An engine failure could cause a sudden loss of power to the wheels and increase the risk of a crash.

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.

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.

Rear wheels that lock suddenly could cause a loss of control and increase the risk of a crash.

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.

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.

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.

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.

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.

Cargo that falls from the truck bed could create a road hazard for others and increase the risk of a crash.

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.

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.

A tonneau cover that separates from a moving vehicle could create a hazard for other drivers and nearby people.

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.

This recall affects certain trucks equipped with optional 18", 20", or 22" wheels and tires. The spare tire has a smaller diameter than the tires on the truck. As a result, the antilock brake system (ABS) may not work properly on certain road surfaces when the spare tire is installed on a rear wheel position. This could lead to an increase in stopping distance or a loss of control.

Reduced braking or a loss of control could increase the risk of a crash.

General Motors will notify owners by mail and advise you to bring your truck to a dealer to replace the spare tire and wheel. The dealer will also apply a new spare tire information label over the existing tire label. You will be provided an owner's manual insert that says which spare tire should be used with the wheels and tires on your truck.

On certain vehicles, the seat belts may have been installed with the wrong bolts. As a result, the seat belt may not be properly attached and may not work as designed in a crash.

A seat belt that does not work properly could increase the risk of injury in a crash.

General Motors will notify owners by mail and instruct you to take your vehicle to a dealer to replace the seat belt bolts, as necessary.

On certain trucks, the seat belt brackets for the front-row centre seat may not be properly attached to the seat frame. As a result, the seat belt could detach, and may not work as designed in a crash.

A seat belt that detaches in a crash could create an increased risk of injury.

General Motors will notify owners by mail and instruct you to take your truck to a dealer to inspect the front-row centre seat belt bracket attachments. The dealer will reassemble the brackets correctly, if necessary.

Certain vehicles were built with tires that may have been cured too long. As a result, the sidewall could crack or the tread and belts could separate. This could lead to a sudden loss of air pressure and could cause a tire failure. Note: This recall only affects vehicles equipped with certain Continental tires, with specific date codes and mold numbers.

A tire failure could cause a loss of control and increase the risk of a crash.

General Motors will notify owners by mail and instruct you to take your vehicle to a dealer to inspect the tires and replace the ones that have the DOT number and production mold number combinations identified by Continental.