Take it to the DEALER...
U lost power..to the radio.
That activated the ANI THEFT codes..
Next time Keep 12volts on the vehicles system when changing the battery
your lucky if you have a coded ignition KEY works also!
Don't recall how far back you can download a manual but may be able to get a
model year close to yours from https://www.mygmlink.com/main/US/en/gm/home
then follow the info provided by the other posters to determine the unlok
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