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
If no one has ever entered a code the default should be 4-0s or 4-1s If it has had a code entered in to it and you dont have it ,, Well,, Sorry.. Lee
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