2021 GMC Sierra 1500 power train problems
134 owner complaints filed with NHTSA name the power train on the 2021 GMC Sierra 1500 — 24% of all complaints for this model year.
What owners report
“Transmission failed, Value Body is listed by dealer as the cause. GMC is saying that my vehicle is not part of the recall, even though it is part of the same model, same years as well as the same problem, the value body on the transmission. See estimate from dealership Tucks GMC Hudson, MA…”
filed Sep 8, 2026
“Rear wheel lock up. Very unsafe. I am on my 3rd valve body for my transmission. GM doesn’t want to replace transmission but will warranty for 150k miles. I bumped a semi during one of my lock ups.”
filed Aug 28, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Transmission control valve may fail and cause the rear wheels to lock upCampaign 26V083000 · Feb 12, 2026
- Transmission control valve may fail and cause the rear wheels to lock-upCampaign 24V797000 · Oct 24, 2024
Power Train problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 26 | 22% |
| 2025 Sierra 1500 | 25 | 22% |
| 2024 Sierra 1500 | 68 | 19% |
| 2023 Sierra 1500 | 91 | 19% |
| 2022 Sierra 1500 | 108 | 18% |
| 2020 Sierra 1500 | 96 | 21% |
| 2019 Sierra 1500 | 136 | 21% |
| 2018 Sierra 1500 | 130 | 43% |
| 2017 Sierra 1500 | 117 | 33% |
| 2016 Sierra 1500 | 83 | 24% |
| 2015 Sierra 1500 | 97 | 14% |
| 2014 Sierra 1500 | 69 | 9% |
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.