Transport CanadaCritical
2020 GMC SIERRA HDTransport Canada Recall #2024637
The official notice
Defect
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.
Remedy
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.
52,309 vehicles affectedMfr ref: N242454440Updated June 10, 2026