2006 GMC Sierra 2500 Transmission and drivetrain Problems
- Complaints
- 12about this part
- Share
- 18%of 66 total for the year
- Median mileage
- 34,250miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 12 complaints about the transmission and drivetrain of the 2006 GMC Sierra 2500, 18% of the 66 complaints for this model year. Where a mileage was given, the median is 34,250 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.
“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 should not be losing the transmission at less than 50,000 miles!”
NHTSA complaint #10723692, filed 2015-06, 45,000 miles“I own a 2006 Gmc 2500hd duramax/allison crew cab. I took ownership in feb of 2007 with 32k miles. Transmission lines were leaking at that time. Dealer replaced the lines under warranty. Now at 100k miles and same new lines are leaking once again. This is a flammable fluid and constitutes a potential fire hazard.”
NHTSA complaint #10246015, filed 2008-10, 101,380 miles“I am the shop foreman for a construction company in alaska. I dropped off a 2006 Gmc 2500 pickup last week to the dealer to have a leak looked at. I got a call back from them saying my torque converter was blown. They said Gmc is having problems with the allison transmission at cold temps (campaign # 07293) I had this truck in at 25000 miles to be re-programmed and again at 49000 miles. Now, at 58,000 miles the torque converter is blown and after arguing with Gmc, they will not warranty the work, they want me to pay half of the 3200. …”
NHTSA complaint #10254992, filed 2009-01, 58,260 miles“I have a 2006 Gmc 2500hd that has 31000 miles on it. The transmission cool er lines are leaking and the dealer has been notified about this problem. The new parts are on backorder, meanwhile the truck leaks transmission oil on the ground which could be a potential fire hazard alone with an environmental hazard. Many Gmc 2500hd owners are having this problem. This is not yet a recall but needs to be addressed.”
NHTSA complaint #10217106, filed 2008-02, 30,000 miles“2006 Gmc diesel with allison transmission...lines to transmission cooler leaking. It is a fire hazard...from what I read on the internet it has been a problem with all the transmission lines installed on this truck”
NHTSA complaint #10323574, filed 2010-04, 49,341 milesRelated service bulletins
- 11006421Jul 24, 2024GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or…
- 11001321May 16, 2024This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 10250347Feb 2, 2024This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and…
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10242843Sep 1, 2023The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the…
- 10234619Apr 6, 2023This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 10228863Dec 13, 2022This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and…
- 10227241Nov 18, 2022This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and…
- 10222770Sep 16, 2022This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
Transmission and drivetrain: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 1 | 7% |
| 2025 | 3 | 11% |
| 2024 | 27 | 25% |
| 2023 | 20 | 61% |
| 2022 | 7 | 16% |
| 2021 | 13 | 25% |
| 2020 | 25 | 31% |
| 2019 | 2 | 6% |
| 2018 | 3 | 9% |
| 2017 | 6 | 16% |
| 2016 | 1 | 2% |
| 2015 | 8 | 9% |
| 2014 | 3 | 10% |
| 2013 | 5 | 11% |
| 2012 | 4 | 13% |
| 2011 | 6 | 10% |
| 2008 | 3 | 5% |
| 2007 | 2 | 2% |
| 2006 | 12 | 18% |
| 2005 | 7 | 6% |
| 2004 | 9 | 6% |
| 2003 | 13 | 8% |
| 2002 | 14 | 10% |
| 2001 | 6 | 4% |
| 2000 | 1 | 2% |
| 1999 | 1 | 3% |
| 1998 | 3 | 20% |
Other parts of the 2006 GMC Sierra 2500
30 complaintsSteering
10 complaintsTires
6 complaintsEngine cooling
5 complaintsElectrical system
4 complaintsAir bags
3 complaintsFuel system
2 complaintsSuspension
2 complaintsLatches, locks and linkages
1 complaintsBody and structure
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaintsWheels
1 complaints
← All problems reported for the 2006 GMC Sierra 2500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 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