Help with door locking problem
 

Hello, I am new here and have a question if anybody could help I would appreciate it. My father in law has a 03 Silverado Duramax extended cab pickup and the doors lock automatically. Not the automatically like they are supposed to, this one locks while it is in the garage, on the road, keys in, keys out it doesnt matter it just locks when it wants to. Does anybody have any idea what I could look for? Thanks in advance and I look forward to reading the forums.

Does it only do it when the remote is within range of the truck? Could be an intermittent remote control.

Thanks for the reply, I'll ask him if that is the case. Thanks again.