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.
Problems for specific GMC Yukon XL Denali years:
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Most reported 2011 GMC Yukon XL Denali problems
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.
The steering wheel position sensor may fail, resulting in the service stability message being displayed.