Table 1 shows seven common electrical system related problems of the 2020 GMC Sierra 1500. The number one most common problem is related to the electrical system (65 problems). The second most common problem is related to the battery dead (two 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...
On two separate occasions, the truck has been dead when attempting to crank. There were no lights or devices left on after the previous time the truck had been used. Something is drawing power from the battery causing it to be dead. Read details...
~tl-the contact owns a 2020 GMC Sierra 1500. The contact stated that intermittent the vehicle would not start. The contact also stated that the vehicle failed to start rondonwnly. The contact stated when he start the vehicle using the key fob, the vehicle failed to start but when he attempted a Read details...