Table 1 shows three common power train related problems of the 2020 GMC Sierra 1500. The number one most common problem is related to the power train (75 problems). The second most common problem is related to the automatic transmission torque converter (three problems).
| Problem Category | Number of Problems |
|---|---|
| Power Train problems | |
| Automatic Transmission Torque Converter problems | |
| Automatic Transmission Control Module problems |
Truck broke down with a rear-wheel lockup and had the transmission replaced in June 2025. In December 2025 and February 2026, truck lost power two times and entered limp mode while on a major highway and major interstate. Read details...
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly sputtered. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with torque converter failure. Read details...
The contact owns a 2020 GMC Sierra 1500. The contact stated while driving approximately 40-60 mph, the transmission hesitated while depressing the accelerator pedal. A dealer was contacted. The vehicle was taken to the dealer and was diagnosed with transmission control module (tcm) failure. Read details...