The power locks on my driver side door won't work anymore. Has anyone else had this problem? I've got a Clifford alarm system. The locks won't work with my key fob, alarm fob, or the push button inside the truck.

 

If it is just one door I would think its just an actuator. I've had issues with my fords. My parents have a Yukon XL(I know different brand) and the have had actuators go out several times. I'm not sure how hard it is to get to in the door but I imagine its doable. If not then the dealer should cover it under warranty. Hope this helps.