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when i had the BCM changed in my denali, it wiped both my transmitters out. i still have yet to reprogram one of them. BUT that was with a NEW BCM.
if the bcm was changed and then the new fob was programmed, it should render any previous fobs inactive, however if the fob was just programmed, the old one is still working. Even just unplugging the bcm shouldnt really work since think about it, if your battery dies or gets replaced, you dont need to reprogram your fobs.
only way to cut off that old fob is a new bcm, sorry.
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