One problem related to manifold/header/muffler/tail pipe has been reported for the 2001 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 GMC Yukon based on all problems reported for the 2001 Yukon.
My Yukon xl k2500 with the 8. 2 liter engine - 495 ci - burns oil and at first the dealer said it should not burn more than 1 quart every 1800 miles which mine does and the dealer/gm tried a new pvc valve then a new intake manifold gasket and nothing helped. Now gm says a quart every 100 gallons of gas is the cut off!.