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Model Years Affected: 2007, 2008, 2009, 2010
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
The gas cap was not on properly
Common Problems > GMC Yukon XL 2500
Q&A > GMC > 2007 GMC Yukon XL 2500
Q&A > GMC > 2001 GMC Yukon XL 2500