key fob programming
#3
They usually have one of two possible problems. see https://www.chevyhhr.net/forums/how-tutorial-library-21/keyfob-cold-solder-repair-22641/ and https://www.chevyhhr.net/forums/how-tutorial-library-21/repair-key-fob-remotes-worn-out-contacts-30813/ I bet the info in one of those threads will fix your old fobs
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