Two problems related to engine have been reported for the 2003 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 GMC Yukon based on all problems reported for the 2003 Yukon.
My 2003 GMC denali is knocking in the engine and dealer say's it's normal and will not replace motor and my extended warranty is going to be up in a few hundred miles what do I do???.
The consumer indicated that GMC manufactured a large number of 5. 3 liter engines with either under sized pistons or over sized combustion cylinders which resulted in piston slap. The noise is very loud when the engine is cold but after a period of 10-15 minutes the noise goes away. The consumer indicated that the manufacturer would issue an extended warranty to consumer's who contacted them about this problem. The consumer feels the manufacturer should either replace the engine or repair the problem.