Table 1 shows six common power train related problems of the 2006 GMC Sierra 2500. The number one most common problem is related to the automatic transmission cooler (four problems). The second most common problem is related to the transmission fluid leaking (two problems).
Went to GMC dealer because truck has a transmission oil leak. Technician noted that all three transmission oil cooler line are leaking Read details...
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. Read details...
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. Read details...