Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific GMC Yukon XL Denali years:
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Repairpal verified 2010 GMC Yukon XL Denali problems
One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.