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That means you have to fix the theft deterrent subsystem. If you have access to a scanner that can read GM Body Codes, there are a couple of codes related to the theft deterrent system. If the scanner indicates the codes are set, they may lead you toward the problem.
The with and without 3-letter codes mentioned in the manual are RPO codes and you can tell if your car has those options by reading the RPO tag in 2014, through 2016 cars or looking up the QR code on the drivers door frame to see the list of the RPO codes for the 2017 through 2019 models.
I was able to erase it with the scanner, but when I tried to program the second key, it popped up. I've been there twice and they've charged me quite a bit, so I wanted to see if anyone could give me a solution.
Solution. I brought a remote for the second key. It came to me to program it since I tried several times and couldn't. And with this, the anti-theft protection was erased.
It came to me to program it since I tried several times and couldn't.
And with this, the anti-theft protection was erased.
OK.
If you can't program it at this point, I'd return the key and buy the right one from the dealer and have them wipe it all and start again. Problems can occur if you bring the key to them to work and it doesn't work right. Most places don't like it when you bring the parts and they will even write on the invoice "Installed customer supplied part". IOW, I don't guarantee results.
Not sure I follow how any anti-theft protection changes.
Solution. I brought a remote for the second key. It came to me to program it since I tried several times and couldn't. And with this, the anti-theft protection was erased.
The same thing happened with mine. Successful programming of the second fob cleared the issue.
