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I seem to have the opposite problem I’m seeing most people post about. Not being able to enter programming mode.
I have a 2003 ZR5 and I can enter the mode no problem. Hold unlock, key cycle twice, door locks cycle, hold lock and unlock on the fob, door locks cycle… now here’s the problem:
When I turn the key on after all that to exit programming mode, nothing happens!
I know the fob is working because the truck indicates a successful programming by the door locks cycling. But after that the fob will not lock or unlock the doors. Not sure how else I could “save” the programming after the door locks cycle.
 

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Are you 100% sure that your following each step correctly from the correct instructions?

I had a similar problem on a different chevy.

And I tried everything that I knew of to take the time to do and ended up being something I couldn't fix and the last answer I got from someone was that its because its aftermarket key fob.

I still was trying to figure it out but didn't spend anymore time on it.

Hopefully someone else has a better answer than me,
 
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