Table 1 shows six common electrical system related problems of the 2021 GMC Sierra 1500. The number one most common problem is related to the electrical system (52 problems). The second most common problem is related to the integrated trailer brake control (one problem).
The intermediate speed sensor 2 and internal transmission harness failed. The repair was to replace the internal transmission harness and intermediate speed sensor. This vehicle is a 2021 and I was told this was recalled on a 2022 only. Read details...
My truck had smoke rolling out at work when I noticed it. Tried to put it out it burnt my hands ! destroyed the inside I had it towed and insurance investigator said it was do to a brake controller for the trailer. Read details...
[xxx], I purchased a 2021 GMC Sierra 1500 from faulkner Chevrolet in bethlehem, PA. I test drove the vehicle before purchase and it showed no indication of any mechanical issues that I was able to detect. Read details...