The power door lock actuators may become slow to operate or stop working completely and require replacement.Google+
Car Problem Reports
Chevrolet 1500 Pickup Power Door Lock Actuators May Fail
Chevrolet 1500 Pickup Problem
Average Mileage: 143,250 mi (100,000 mi - 211,000 mi)
During cold weather, these door locks will not hardly work. I am not impressed with this truck at all. We have had multiple issues with this REGENCY CONVERSION Chevrolet Silverado truck .......... What gives ?
Passenger side door lock won't lock easily have to try and do it by hand or push lock repeatedly tell it goes down.
This problem happened to me on my 1992 chevy truck. I just live with it.