2021 GMC Yukon electrical system problems
30 owner complaints filed with NHTSA name the electrical system on the 2021 GMC Yukon — 9% of all complaints for this model year.
What owners report
“Water is entering the passenger cabin through failed front sunroof drain tubes on both the left and right sides. The drains discharge inside the A pillars rather than to the exterior, pooling in the driver's side floorboard. An authorized GMC dealer diagnosed the cause in writing on August 12, 2026…”
filed Sep 11, 2026
“While driving the vehicle on the interstate, the vehicle shifted to neutral without warning. Our daughter was able to fortunately coast to the side of the interstate without incident. The vehicle was shut off and attempted to turn back on without success, so vehicle was towed to Lugoff Chevy…”
filed Aug 31, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Yukon years
| Year | Reports | Share |
|---|---|---|
| 2026 Yukon | 3 | 8% |
| 2025 Yukon | 8 | 15% |
| 2024 Yukon | 18 | 17% |
| 2023 Yukon | 28 | 12% |
| 2022 Yukon | 31 | 17% |
| 2020 Yukon | 2 | 6% |
| 2019 Yukon | 9 | 17% |
| 2018 Yukon | 3 | 4% |
| 2017 Yukon | 21 | 11% |
| 2016 Yukon | 53 | 20% |
| 2015 Yukon | 79 | 15% |
| 2014 Yukon | 5 | 9% |
Other reported problem areas on the 2021 GMC Yukon
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.