2020 GMC Sierra 2500 power train problems
22 owner complaints filed with NHTSA name the power train on the 2020 GMC Sierra 2500 — 30% of all complaints for this model year.
What owners report
“While driving down a highway doing between 45 and 55 mph the transmission suddenly and completely faulted causing the truck to come to a complete stop. Just enough power to get to the shoulder luckily. The transmission had basically completely blown out, fluid everywhere. The insurance company did…”
filed Mar 10, 2026
“A couple times I heard loud clanking coming from rear brakes. One time in particular I was trying to stop and it felt line someone had ran into my truck but must have been the rear wheel locking up”
filed Feb 15, 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 2500 years
| Year | Reports | Share |
|---|---|---|
| 2025 Sierra 2500 | 3 | 12% |
| 2024 Sierra 2500 | 23 | 24% |
| 2023 Sierra 2500 | 20 | 67% |
| 2022 Sierra 2500 | 5 | 12% |
| 2021 Sierra 2500 | 12 | 24% |
| 2019 Sierra 2500 | 2 | 6% |
| 2018 Sierra 2500 | 3 | 9% |
| 2017 Sierra 2500 | 6 | 16% |
| 2016 Sierra 2500 | 1 | 2% |
| 2015 Sierra 2500 | 8 | 9% |
| 2014 Sierra 2500 | 3 | 10% |
| 2013 Sierra 2500 | 5 | 11% |
Other reported problem areas on the 2020 GMC Sierra 2500
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.