One problem related to turn signal has been reported for the 2016 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2016 GMC Yukon based on all problems reported for the 2016 Yukon.
Brake light/turn signal fail with no warning to driver. The failure requires replacement of the entire component. Dealer quoted $826 to replace assembly. I understand that these have a very high failure rate. Along with the lack of warning to the driver that their rear brake lights and turn signals are not working this is serious problem. The failure rate is so high that several independents are repairing them.