One problem related to engine overheat has been reported for the 2005 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 2500 based on all problems reported for the 2005 Sierra 2500.
This model year has an engine defect from the manufacturer. The head gasket is known to break causing the engine to overheat. This can cause several safety issues dependent on the circumstance at the time of the engine overheating. After some research, it is openly known that this is a defect from the manufacturer for this particular engine year.