Seems to be a random problem I just purchased mine and no auto locks while it worked on another truck I test drove. IMO this is a safety issue with anyone with young rear seat passengers that can open the rear doors when unrestrained. Child door locks have their own problems as well. I sent a formal compliant letter to the NHSTA hopefully more truck owners will do the same before an accident happens. Additionally, and although it may be a stretch this may actually fall under many states' lemon laws. Hopefully my dealer resolves, maybe replacing the complete head unit or a software update will do the trick.