Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific GMC Yukon XL Denali years:
Car problem reports
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Newest reported 2008 GMC Yukon XL Denali problems
The keyless entry system may stop working. Our technicians tell us the key fobs and keyless entry receiver may need to be replaced to correct this fault.
The rear window defogger may stop working due to a wire terminal broken off of the rear glass. Our technicians tell us that terminal can be reattached using a special glue or silver solder.