Owners of 2008-2012 Chevy Colorado trucks equipped with manual door locks and OnStar may comment that they hear a click noise in the driver’s door or that the driver’s door power unlocks when unwanted.
What is unique about this concern is that the vehicle is not equipped with power door locks. The power door unlock is for the driver’s door only and is used in conjunction with OnStar in the event a customer needs the vehicle to be unlocked remotely via OnStar. There will be no power lock/unlock switch in the vehicle.
On trucks equipped with an automatic transmission, the door will unlock when shifted into Park. On trucks equipped with a manual transmission, the driver door will unlock when the key is removed from the ignition. If the door is already unlocked, the actuator will still cycle and an audible click may be heard.
This is a normal operating characteristic. In isolated cases, if the system is not operating as designed or is making an unexpected noise in the door, inspect for a loose relay inside the driver’s door, and/or check for an electrical issue resulting in random door unlock cycles (i.e. intermittent short in circuit 194).