2020 GMC Sierra 1500 vehicle speed control problems
11 owner complaints filed with NHTSA name the vehicle speed control on the 2020 GMC Sierra 1500 — 2% of all complaints for this model year.
What owners report
“This truck was bought brand new by my father. Around 38,000 miles it begin having issues with shifting which eventually got worse. When I searched google for issues many others on different pages have had the same issues. The shifting would be so rough it feels like you're being hit by another…”
filed Aug 26, 2026
“The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle decelerated to 30 MPH. The check engine warning light was illuminated. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the timing belt needed to…”
filed Apr 29, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Vehicle Speed Control problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 3 | 3% |
| 2025 Sierra 1500 | 7 | 6% |
| 2024 Sierra 1500 | 10 | 3% |
| 2023 Sierra 1500 | 11 | 2% |
| 2022 Sierra 1500 | 9 | 2% |
| 2021 Sierra 1500 | 7 | 1% |
| 2019 Sierra 1500 | 10 | 2% |
| 2018 Sierra 1500 | 6 | 2% |
| 2017 Sierra 1500 | 11 | 3% |
| 2016 Sierra 1500 | 4 | 1% |
| 2015 Sierra 1500 | 7 | 1% |
| 2014 Sierra 1500 | 12 | 2% |
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.