Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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A common problem on those is that the programming in the module gets corrupted and it has the be "flashed".
So as much as I hate to send someone to the dealer, but in this case it would be best to get a diagnostic and have them tell you what is wrong and then if it is just a programming issue they are your only option.
If it does turn oout to be something else you can make the decsion to fix it yourself or let them do it.