One problem related to horn assembly has been reported for the 2015 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Yukon based on all problems reported for the 2015 Yukon.
Rear liftgate will not open. Replaced liftgate control module and still will not work. Mechanic says it is now body control module. Lights stay on inside vehicle at all times and horn is disabled.