Programming instructions ( steps how program a keyless entry remote) below
IMPORTANT: Before entering programming mode, have in possession all of the GM remote transmitters you will be using on the vehicle. Once you program the transmitter, all previous codes will be erased from the memory if not reprogrammed during the same programming procedure. The other transmitters will not be functional until you program the transmitters again with new remote.
Keep this in mind when you bring your vehicle to the dealer or try this yourself. From what I read it is an easy process so doing it yourself may be the easier route depending on your dealer.
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