2023 GMC Sierra 2500 power train problems
20 owner complaints filed with NHTSA name the power train on the 2023 GMC Sierra 2500 — 67% of all complaints for this model year.
What owners report
“On XXX, I was towing my camper to Copper Center, Alaska from Palmer, Alaska when my truck experienced a full transmission shut down which put the truck into "Reduced Power Mode". We descending down the road right next to Victory Bible Camp (64741 Victory Rd, Sutton-Alpine, Ak 99674) when the…”
filed Jul 7, 2026
“Driving at approximately 30-35MPH merging in traffic, the transmission shuttered and went into reduced power mode. ECM reported a 747 code and valve body failure.”
filed Jan 24, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Power Train problems in other Sierra 2500 years
| Year | Reports | Share |
|---|---|---|
| 2025 Sierra 2500 | 3 | 12% |
| 2024 Sierra 2500 | 23 | 24% |
| 2022 Sierra 2500 | 5 | 12% |
| 2021 Sierra 2500 | 12 | 24% |
| 2020 Sierra 2500 | 22 | 30% |
| 2019 Sierra 2500 | 2 | 6% |
| 2018 Sierra 2500 | 3 | 9% |
| 2017 Sierra 2500 | 6 | 16% |
| 2016 Sierra 2500 | 1 | 2% |
| 2015 Sierra 2500 | 8 | 9% |
| 2014 Sierra 2500 | 3 | 10% |
| 2013 Sierra 2500 | 5 | 11% |
Other reported problem areas on the 2023 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.