2006 GMC Sierra 2500 power train problems
12 owner complaints filed with NHTSA name the power train on the 2006 GMC Sierra 2500 — 18% of all complaints for this model year.
What owners report
“The transmission began to slip. At times, I had to stop the truck and put in park before it would engage in drive. Finally it lost all but 1st gear. Took to dealer and torque converter had to be replaced. Gmc made me pay half the $3200 repair. I do not live in a cold climate. A heavy duty truck…”
filed Jun 5, 2015
“I have a 2006 gmc sierra 2500 with the lbz duramax and allison transmission. Two of the transmission coolant lines began leaking transmission fluid at the crimp ends in dec of 2010. The truck only had 30,000 miles, but was the 36 month warranty period. Service under warranty was denied. An on-line…”
filed Jan 18, 2011
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% |
| 2023 Sierra 2500 | 20 | 67% |
| 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% |
Other reported problem areas on the 2006 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.