Model Years Affected: 2007, 2008, 2009, 2010
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Had the same proble shortly after purchasing my vehicle. Dealer replaced gas cap and no further problems.
Q&A > GMC > 1998 GMC Yukon
Common Problems > GMC Yukon
Q&A > GMC > 1999 GMC Yukon
Q&A > GMC > 2006 GMC Yukon