Table 1 shows two common power train related problems of the 2021 GMC Sierra 2500. The number one most common problem is related to the power train (eleven problems). The second most common problem is related to the automatic transmission (one problem).
| Problem Category | Number of Problems |
|---|---|
| Power Train problems | |
| Automatic Transmission problems |
We keep getting an error message that shows we need to service def system, it also started to limit my mph and is now locked at 55 mph. Initial check of the def system shows a malfunctioning module. It has been happening over the last year to 18 months. Read details...
The contact owns a 2021 GMC sierra. The contact stated that while driving at approximately 70 mph, the vehicle lost power. A " vehicle will not go above 50 mph " message appeared. The vehicle was taken to a dealer where it was sitting been for over four months after being diagnosed that Read details...