• I think that almost every car should have a different code. If it's the original radio then the GMC dealership should be able to look up the VIN number and tell you the code. You may have to provide proof of ownership since that is an anti-theft feature.
  • Go to this website and they can get you your specific unlock code. There's very nice people who run the site and they tell you step by step how to unlock it. Http:// I hope this helps you out!

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