One problem related to automatic transmission fluid/lubricant valves/valve body has been reported for the 2021 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 GMC Sierra 2500 based on all problems reported for the 2021 Sierra 2500.
The contact owns a 2021 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly shifted out of first gear and the vehicle failed to accelerate as needed. The failure had occurred twice. The vehicle was towed to the dealer, who determined that the valve body needed to be replaced. The failure mileage was approximately 38,000.
| Power Train problems | |
| Automatic Transmission Fluid/lubricant Valves/valve Body problems | |
| Automatic Transmission problems |