I have a Pontiac G6 2007 year model sittin in my stall at work. The radio display is saying key fob batt low. I have changed the key fob batteries in both fobs, reset the code that was set and reprogrammed the PCM. For some reason it still seems to display this message. When I try to reprogram the RCDLR the computer is saying it is not there. Any advice as to what to try?