2006 GMC Sierra 2500 transmission problems

Filed Jun 5, 2015 · Transmission · 45,000 miles · GA

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!

Filed Jan 18, 2011 · Engine, Transmission · 30,000 miles · MI

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 search reveals several others have complained about this issue and that the dealer installed oem replacement lines are no better (developing leaks soon after replacement), yet no tsb or corrective action has been issued by gm. Leaking transmission fluid is a fire and environmental hazard. The leaks are getting worse.

Filed Apr 3, 2010 · Transmission · 49,341 miles · MN

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

Filed Nov 2, 2009 · Transmission · 32,000 miles · NV

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 march of 2009. The truck only had 32,000 miles, but was 3 months beyond the 36 month warranty period. Service under warranty was denied. An on-line search reveals several others have complained about this issue and that the dealer installed oem replacement lines are no better (developing leaks soon after replacement), yet no tsb or corrective action has been issued by gm. Leaking transmission fluid is a fire and environmental hazard. The leaks are getting worse.

Filed Apr 24, 2009 · Electrical, Engine · 22,800 miles · FL

Tl*the contact owns a 2006 gmc sierra 2500. The fly wheel, which runs with the transmission and helps change gears has had to be replaced three times within two years. While driving approximately 10 MPH during the first failure, there was a loud clicking noise and it became louder over time. The dealer stated the vehicle was operating normally. A few weeks later, the noise was much louder; however, a different dealer 2 hours away diagnosed the vehicle and stated that the fly wheel failed. After being repaired 24,000 miles and a year later, the failure recurred. The fly wheel was replaced again and lasted 5 months before it failed. The power steering shaft also needed to be replaced due to it being worn out and failed again nine months later. The failure mileage was 22,800 and the current mileage was 55,000. Updated 06/08/09 *bf the power steering gear was leaking due to leaking gear assembly, the HVAC blower was inoperative, the flywheel was cracked. The dealer replaced the stripped and broken exhaust studs. Updated 06/18/09.

Filed Jan 14, 2009 · Transmission · 58,260 miles · AK

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. I drove up in out company's brand new '08 gmc 3500, had the dealers mechanic look at it. He sniffed the tranny dipstick, grimmanced, and said that it too was blown. At 4120 miles, another blown torque converter. The service manager said 17 trucks so far in fairbanks alaska have suffered similar fates, due to this manufacturer error. I am livid, to say the least! Gmc needs to be held accountable for this, and owners need to be contacted and told that there is a problem! There is a safety angle as well, according to the mechanic--at a stop light, the torque converter went out, locked up, and pushed the vehicle through the light!

Filed Oct 19, 2008 · Transmission · 101,380 miles · 00

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.

Filed Sep 18, 2008 · Transmission · 40,000 miles · ME

Tl*the contact owns a 2006 gmc sierra 2500. The contact has a manual transmission vehicle with the wrong hydraulic fluid in the clutch system. This could cause the clutch to fail without warning. When the contact depresses the clutch pedal, it does not engage the transmission and stop the vehicle. The failure occurs intermittently. The clutch and all the hydraulic parts were replaced more than once, but the failure persists. He called gmc and was informed that all the vehicles were made with the incorrect fluid. The VIN was unknown. The failure mileage was 40,000.

Filed Mar 22, 2008 · Transmission · 36,500 miles · MD

Transmission cooler line leaking transmission fluid at an aluminum crimp that connects a rubber hose to the transmission cooler; an inferior design. As such, a transmission oil leak is a fire hazard. I am aware of two car fires that were caused by leaking transmission cooler lines. The last one involved a ford taurus station wagon where the owner had the transmission rebuilt by his local transmission shop (a national franchise transmission repair shop) and they cross-threaded the lower cooler line at the transmission. The transmission fluid leaked on to the exhaust cross-over pipe and the car burned to the ground on the side of road in the interstate. The owner's insurance company subrogated against the transmission shop for the damages. Fortunately, no one got hurt, but they came close.

Filed Feb 6, 2008 · Transmission · 30,000 miles · LA

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.