There is a code to get from the radio, then a Technicians will call GM to get the actual unlock code. Only takes a few minutes.
See this link to do it yourself. They have a 1 hour turn around...
GM Radio Unlock Codes
No. You will need to take it to a gm shop to have it fixed. Each time there is a differant code in the radio, the tech will get that code and will call gm headquarters and get the special unlock code. You have to be a gm cerified tech to get the code from gm. I wish they would made this system more costomer friendly, but that's what they decided.
Radio lock codes:
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