2021 GMC Sierra 1500 structure problems
11 owner complaints filed with NHTSA name the structure on the 2021 GMC Sierra 1500 — 2% of all complaints for this model year.
What owners report
“There is a water leak in the rear passenger compartment of my vehicle. Unsure where water is coming from. Continued leaking poses a risk to my safety as I may be exposed to black mold as well as anyone else who is riding in my vehicle. The problem hasn’t been addressed by the dealer yet but this is…”
filed Jun 28, 2026
“The contact owns a 2021 GMC Sierra LD Crew. The contact stated that while driving on the highway at an undisclosed speed, the vehicle's bedrail attachment fully detached from the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure…”
filed May 4, 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 | 3% |
| 2025 Sierra 1500 | 3 | 3% |
| 2024 Sierra 1500 | 23 | 7% |
| 2023 Sierra 1500 | 65 | 15% |
| 2022 Sierra 1500 | 96 | 18% |
| 2020 Sierra 1500 | 12 | 3% |
| 2019 Sierra 1500 | 15 | 2% |
| 2018 Sierra 1500 | 6 | 2% |
| 2017 Sierra 1500 | 8 | 2% |
| 2016 Sierra 1500 | 6 | 2% |
| 2015 Sierra 1500 | 27 | 4% |
| 2014 Sierra 1500 | 31 | 4% |
Other reported problem areas on the 2021 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.