One problem related to engine cooling system has been reported for the 2006 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 GMC Sierra 2500 based on all problems reported for the 2006 Sierra 2500.
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.
| Engine Exhaust System problems | |
| Radiator problems | |
| Engine Cooling System problems | |
| Engine And Engine Cooling problems |