2020 GMC Sierra 1500 structure problems
13 owner complaints filed with NHTSA name the structure on the 2020 GMC Sierra 1500 — 3% of all complaints for this model year.
What owners report
“I have a rear sliding window on the cab of my truck that leaks from both ends of the plastic guide. I noticed it when placing my young children in their car seats. I contacted my dealership and was informed the repair would cost $1500+ and not be covered by GM or warranty.”
filed Aug 26, 2026
“The frame of the back window is cracking allowing water to come in through the back glass. This is causing the headliner and other components such as air bags and other electrical components to get wet and damaged. This could cause risk of fire or failure of safety components within the vehicle…”
filed Mar 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Structure problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 2 | 2% |
| 2025 Sierra 1500 | 3 | 3% |
| 2024 Sierra 1500 | 25 | 7% |
| 2023 Sierra 1500 | 78 | 17% |
| 2022 Sierra 1500 | 100 | 17% |
| 2021 Sierra 1500 | 12 | 2% |
| 2019 Sierra 1500 | 15 | 2% |
| 2018 Sierra 1500 | 6 | 2% |
| 2017 Sierra 1500 | 8 | 2% |
| 2016 Sierra 1500 | 7 | 2% |
| 2015 Sierra 1500 | 28 | 4% |
| 2014 Sierra 1500 | 31 | 4% |
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.