2015 GMC Sierra 2500 electrical system problems
11 owner complaints filed with NHTSA name the electrical system on the 2015 GMC Sierra 2500 — 12% of all complaints for this model year.
What owners report
“Odometer Fraud. The contact purchased a 2015 GMC Sierra 2500. The contact stated that while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 189,458 and the contact stated he…”
filed Jan 26, 2026
“Electric trailer brake control modular is malfunctioning on my 2015 GMC Sierra Denali 3500. Multiple of sources told me this is a common problem with this generation of GMC.”
filed Jul 26, 2024
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Sierra 2500 years
| Year | Reports | Share |
|---|---|---|
| 2024 Sierra 2500 | 31 | 32% |
| 2023 Sierra 2500 | 5 | 17% |
| 2022 Sierra 2500 | 12 | 29% |
| 2021 Sierra 2500 | 6 | 12% |
| 2020 Sierra 2500 | 12 | 16% |
| 2019 Sierra 2500 | 9 | 28% |
| 2018 Sierra 2500 | 7 | 20% |
| 2017 Sierra 2500 | 6 | 16% |
| 2016 Sierra 2500 | 9 | 15% |
| 2014 Sierra 2500 | 4 | 13% |
| 2013 Sierra 2500 | 3 | 7% |
| 2012 Sierra 2500 | 4 | 13% |
Other reported problem areas on the 2015 GMC Sierra 2500
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.