2020 GMC Sierra 1500 service brakes problems
49 owner complaints filed with NHTSA name the service brakes on the 2020 GMC Sierra 1500 — 11% of all complaints for this model year.
What owners report
“Lifter failed due to AFM system. Cyl 8 misfire due to oil fouling. The onboard computer got confused and would not release the parking brake until repeated attemtps to release it. 5.3L V8 2020 model year 115250 miles. Isn't this the same problem as the 2021 and newer engines? 8spd transmission. AFM…”
filed Sep 7, 2026
“The contact’s mother-in-law owns a 2020 GMC Sierra 1500. The contact stated that while her brother-in-law was starting the vehicle, the brake, service engine, and engine warning lights illuminated and the vehicle failed to start. The contact stated that the failure was associated with NHTSA Action…”
filed Jul 17, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Bolts used to attach the front and/or rear brake calipers may have not been heat treated…Campaign 20V116000 · Feb 27, 2020
Service Brakes problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 2 | 2% |
| 2025 Sierra 1500 | 6 | 5% |
| 2024 Sierra 1500 | 10 | 3% |
| 2023 Sierra 1500 | 14 | 3% |
| 2022 Sierra 1500 | 28 | 5% |
| 2021 Sierra 1500 | 23 | 4% |
| 2019 Sierra 1500 | 107 | 17% |
| 2018 Sierra 1500 | 40 | 13% |
| 2017 Sierra 1500 | 100 | 28% |
| 2016 Sierra 1500 | 100 | 29% |
| 2015 Sierra 1500 | 219 | 31% |
| 2014 Sierra 1500 | 139 | 19% |
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.