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According to the GM manual you have to program all the fobs at once, so if you one do one then decide to add another you have to do them all over again later. You can program up to 4 at once and when you start with new or different ones it wipes out the old transmitters remembered. New BCM means new transmitters need to be programmed because it has nothing in memory. AFAIK they are flashed to the prom so losing power to the BCM will not affect it "remembering" the programmed transmitters
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