2026 GMC Sierra 3500 Transmission and drivetrain Problems
- Complaints
- 2about this part
- Share
- 40%of 5 total for the year
- Median mileage
- 500miles
- Trend
- Too newThis model year is less than 4 years old, so a trend is not meaningful yet.
NHTSA recorded 2 complaints about the transmission and drivetrain of the 2026 GMC Sierra 3500, 40% of the 5 complaints for this model year. Where a mileage was given, the median is 500 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Have been driving it on four separate occasions and the engine will start running rough and shut off leaving me with no power brakes or power steering. Once when I was going about 30 miles an hour the other three times when I was coming to a stop with a trailer on just took it in Kendall Chevrolet for the first time they are still working on it but unable to duplicate the problem this is a very serious safety concern for myself and possibly for others that have the same issue”
NHTSA complaint #11744605, filed 2026-06“The contact owns a 2026 GMC Sierra 3500. The contact stated that while driving at 35-40 MPH on the interstate and towing a loaded trailer, the vehicle experienced reduced braking performance. No warning lights illuminated. The local dealer was contacted and informed that the brakes performed differently. Additionally, the dealer stated that the transmission was not downshifting. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 500.”
NHTSA complaint #11749030, filed 2026-07, 500 milesRelated service bulletins
- 11037330Sep 17, 2026Certain vehicles may have received transmission mounting bolts that do not meet expected hardness specifications. Loose or failed bolts may result in hard shifting from the…
- 11033783Jun 10, 2026Certain vehicles may have a condition in which the bolts for the transmission control valve body may be loose or missing. Dealers will retorque or replace the suspect valve body…
Transmission and drivetrain: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 2 | 40% |
| 2025 | 1 | 6% |
| 2024 | 13 | 25% |
| 2023 | 14 | 50% |
| 2022 | 6 | 19% |
| 2021 | 7 | 35% |
| 2020 | 19 | 37% |
| 2019 | 1 | 8% |
| 2018 | 1 | 7% |
| 2017 | 3 | 23% |
| 2016 | 2 | 11% |
| 2015 | 1 | 3% |
| 2014 | 1 | 14% |
| 2013 | 2 | 14% |
| 2012 | 3 | 33% |
| 2011 | 2 | 10% |
| 2009 | 2 | 40% |
| 2008 | 1 | 4% |
| 2007 | 2 | 13% |
| 2006 | 3 | 27% |
| 2004 | 1 | 4% |
| 2003 | 1 | 14% |
| 2000 | 3 | 12% |
| 1997 | 2 | 20% |
Other parts of the 2026 GMC Sierra 3500
2 complaintsBrakes
1 complaintsElectrical system
1 complaintsFuel system
1 complaintsSteering
1 complaints
← All problems reported for the 2026 GMC Sierra 3500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology