2021 GMC Sierra 1500 electrical system problems
73 owner complaints filed with NHTSA name the electrical system on the 2021 GMC Sierra 1500 — 13% of all complaints for this model year.
What owners report
“Dashboard keeps returning to aljarir type writing. We bought it with American English but won't stay in English. Monday will be 30 day and I believe the dealer is ghosting me. Y'all have any ideas how to reset the dashboard without replacing the radio??? Closest answer I was given.”
filed Sep 15, 2026
“The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving approximately 25 MPH near the residence with the contact's daughter as a passenger, the vehicle experienced a complete loss of motive power when depressing the accelerator pedal. Several unspecified warning lights…”
filed Aug 27, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 12 | 11% |
| 2025 Sierra 1500 | 24 | 21% |
| 2024 Sierra 1500 | 41 | 12% |
| 2023 Sierra 1500 | 61 | 13% |
| 2022 Sierra 1500 | 82 | 14% |
| 2020 Sierra 1500 | 79 | 17% |
| 2019 Sierra 1500 | 94 | 15% |
| 2018 Sierra 1500 | 43 | 14% |
| 2017 Sierra 1500 | 54 | 15% |
| 2016 Sierra 1500 | 54 | 16% |
| 2015 Sierra 1500 | 96 | 13% |
| 2014 Sierra 1500 | 128 | 17% |
Other reported problem areas on the 2021 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.