Five problems related to manifold/header/muffler/tail pipe have been reported for the 2007 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 GMC Yukon based on all problems reported for the 2007 Yukon.
Bolts breaking the bolts breaking off the exhaust manifold and putting a crack in it I looked it up and it's coming on gm vehicles with from ranging 2003 to 2009.
Exhaust manifold bolts are breaking which could allow exhaust to get into cab.
Exhaust manifold mounting bolts fail. Manifold separates from cylinder head causing exhaust leak .
Front left exhaust manifold bolt head broke off. When the engine is cold upon startup exhaust gases escape near a water temperature sensor. Which could make the engine light come on and not pass inspection or cause a fire.
When vehicle was inspected I was told that there was an exhaust leak in exhaust manifold. Dealership found a broken bolt on left side and replaced it. I have just been informed that I now as of 01/30/2012 with 62,760 miles I have another bolt broken on the right side. After researching on internet it is obvious that gm has a design fault in using lower grade bolt which are breaking in large numbers. I implore the ntsa to require gm to replace these defective bolts either by recall or as incident occurs at no cost to car owners. I am told that the exhaust leak can cause failure of the catalytic converter and other engine failure problems which can result in safety issues.