2020 GMC Sierra 1500 electrical system problems
77 owner complaints filed with NHTSA name the electrical system on the 2020 GMC Sierra 1500 — 17% of all complaints for this model year.
What owners report
“- the ground strap corroded and broke apart. Yes, I have the ground cable that failed, if needed for inspection. - yes!!! The truck's steering kept going in and out of manual steering and the engine reduced in speed allowed, and then the engine cut out on me completely - while I was in the middle…”
filed Jun 8, 2026
“2020 GMC sierra 1500 infotainment system including navigation,OnStar and voice command, stoped working on Friday May 15th with no prior warning. These systems are integral for modern safe travel and severely affects the value and driver confidence in the vehicle. It seems to be running mechanically…”
filed May 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Battery positive (B+) cable rings may have been manufactured with excessive glue…Campaign 19V888000 · Dec 12, 2019
Electrical System problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 8 | 12% |
| 2025 Sierra 1500 | 21 | 23% |
| 2024 Sierra 1500 | 39 | 12% |
| 2023 Sierra 1500 | 55 | 13% |
| 2022 Sierra 1500 | 79 | 15% |
| 2021 Sierra 1500 | 71 | 13% |
| 2019 Sierra 1500 | 94 | 15% |
| 2018 Sierra 1500 | 42 | 14% |
| 2017 Sierra 1500 | 54 | 15% |
| 2016 Sierra 1500 | 54 | 16% |
| 2015 Sierra 1500 | 93 | 13% |
| 2014 Sierra 1500 | 128 | 17% |
Other reported problem areas on the 2020 GMC Sierra 1500
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.