Remote start question. 2008 GXP. I was under the assumption that all GXP'S were equipped with it however mine is not. The option code is not on the glove box label. I also understand that all cars were capable of remote start if enabled in the BCM. I took the car to a mechanic and was told that the remote start was activated but was not receiving the command to start. I even bought 2 new GM transmitters and had them programmed but still nothing. Is there another module that I need? Any help would be appreciated.