One problem related to catalytic convertor has been reported for the 2004 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 GMC Yukon based on all problems reported for the 2004 Yukon.
Loud pinging noise from exhaust which continues 5-10 minutes after car is turned off, also has vibration in steering wheel and dash when at a sit still in either drive or park, rpm are not changing when vibrating, exhaust is extremely loud.