The power door lock actuators may become slow to operate or stop working completely and require replacement.Google+
Car Problem Reports
GMC Yukon Denali Power Door Lock Actuators May Fail
GMC Yukon Denali Problem
Average Mileage: 99,317 mi (45,000 mi - 160,000 mi)
Visitor, 2008 GMC Yukon Denali, 114,000 mi
Door actuators have stopped working only on drivers side
Visitor, 1999 GMC Yukon Denali, 113,000 mi
I just had to replace these, and my BCM and the only problems left are the dash lights dont work and the a/c shuts off when it wants..
Visitor, 2008 GMC Yukon Denali, 160,000 mi
Rear door on left side will not lock with key fob or when all other doors lock when you start to drive. Does not work with the master lock from driver location either. We manually lock the door when we get out but is easy to forget to do this. Also is a safety issue she grand children ride in the car.
Visitor, 2008 GMC Yukon Denali
passenger door lock actuator quit working