I have the same problem with my 2008 Grand Prix - replaced the batteries in both key fobs - they worked for a few days and quit working. Remote start does not work and both of the cigarette lighter chargers do not work either. I have recieved a "charging system failure" message on the readout screen as well. I have checked with 2 different mechanics and they are not sure what it is. Any help would be appreciated. Thanks!
I have the same issue. I read on others post and some of the answers said if you have an engine light on it will not work. Appearently GM made it that way. Once your engine light is off, it will work again. Once again this what I read. Neither of my Key Fobs work after replacing my batteries and I DO have an engine light on. I have also read others saying you have to bring it to a dealership to get reprogrammed.
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Press and hold down both the lock and unlock buttons for fifteen seconds and listen for the beep which will signal that the fob has been programmed. Continue this for all existing and new fobs, you will be able to program four remotes to your Grand Prix and will have to do them all at once due to the memory being forgotten every time you enter Programming Mode. Once you have programmed all of the remotes and heard a beep for each one programmed, remove the key from the ignition to exit Programming Mode. You are now free to test your fobs and ensure that they all work.
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