Is it intermittent when the engine is warm? In other words, have you tried coming back from a ride, shutting it off, and locking the door, and then restarting with the key fob? What happens then? Also what happens when you try the remote start when your standing just outside of the truck as opposed to being inside the house? Also do you have two key fobs? What happens when you try the other one? Just trying to cover the basics.