2018 GMC Sierra 1500 electrical system problems
43 owner complaints filed with NHTSA name the electrical system on the 2018 GMC Sierra 1500 — 14% of all complaints for this model year.
What owners report
“There was a mass recall on 2018 GMC Sierras to due to a faulty break pump vaccum. We are experiencing the same problems but for some reason were not included in the recall. We were told to reach out on here as others have to see what can be done as this is a saftety hazard.”
filed Aug 26, 2026
“1. Electronic power steering modular issue. My 2018 GMC SEIRRA 1500 CREW CAB JUST LOST ALL POWER STEERING. THEN WHEN I PARK IT. Assist notifications come on, ABS notices, BRAKE light stays on, trailer/tow notifications, trailer assist, parking brake, etc SUDDENLY A LOUD thump & feels like the whole…”
filed Mar 3, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 12 | 11% |
| 2025 Sierra 1500 | 24 | 21% |
| 2024 Sierra 1500 | 41 | 12% |
| 2023 Sierra 1500 | 61 | 13% |
| 2022 Sierra 1500 | 82 | 14% |
| 2021 Sierra 1500 | 73 | 13% |
| 2020 Sierra 1500 | 79 | 17% |
| 2019 Sierra 1500 | 94 | 15% |
| 2017 Sierra 1500 | 54 | 15% |
| 2016 Sierra 1500 | 54 | 16% |
| 2015 Sierra 1500 | 96 | 13% |
| 2014 Sierra 1500 | 128 | 17% |
Other reported problem areas on the 2018 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.