GMC Troubleshooting Questions? Ask a Mechanic for Answers
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The dealer has to reprogram it with their computer plugged into your vehicle programming the coding into the radio.What will prevent this from being programmed correctly is if the wrong part number radio was installed that isnt fully compatible with your vehicle here or the replacement radio itself is defective as well and would need replaced again.
If you know for sure this is the correct part number radio and all electrical connections are connected properly and if the dealer is correctly trying to program/code it usually this indicates the replacement radio is defective as well needing replaced again.These would be the only things keeping it from programming.
On some models the air bag computer and body control computer needed programmed/coded as well to to correctly set up a new or replacement radio so I would make sure they are checking into this as well.
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