Unfortunately we don't have a manual on this vehicle but this is a theft system issue.
We need to start with checking the codes and finding out what is there because this normally puts a couple codes in the PCM to tell us what is happening.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Then we are going to have to try some of the GM tactics to disarm the system starting with putting the key in the ignition in the on position for up to 30 minutes to see if it turns the system off.
https://www.2carpros.com/articles/how-to-reset-a-security-system
If this doesn't work then we will most likely need to contact a dealer to see what they say about how to disable this system.
Please run through this info and let us know what you find. Thanks
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Friday, September 24th, 2021 AT 4:38 PM