2020 GMC Sierra 1500 power train problems
96 owner complaints filed with NHTSA name the power train on the 2020 GMC Sierra 1500 — 21% of all complaints for this model year.
What owners report
“5/5/25 woke up back seat entire truck flooring soaking wet back glass cracked. 4/8/25 transmission went out 117,000 miles 7/3/25 exhaust leak and placed nox 1. 7/8/25 127551 mileage exhaust leak replace gaskets, belt , tensioner, and pulley, 6/8/2025 3 knock sensors replaced and replaced intake…”
filed Sep 15, 2026
“Powertrain issues and a chassis issue that is extremely dangerous.Tailgate on rare occasions falls open by itself. There is a design flaw in the placement of the catalytic converters. The heat is burning up the fluid. I could not believe my eyes when I serviced the transmission. This is another…”
filed Sep 9, 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
- One of the driveshaft joints may not have been properly welded, causing the driveshaft to…Campaign 20V650000 · Oct 22, 2020
Power Train problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 25 | 23% |
| 2025 Sierra 1500 | 24 | 21% |
| 2024 Sierra 1500 | 68 | 19% |
| 2023 Sierra 1500 | 91 | 19% |
| 2022 Sierra 1500 | 108 | 19% |
| 2021 Sierra 1500 | 134 | 24% |
| 2019 Sierra 1500 | 136 | 21% |
| 2018 Sierra 1500 | 128 | 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 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.