GPS indicating check map dsc error
This is a common navigation radio issue on this vehicle. The message "Map DVD read error" comes on randomly.... sometimes it works, sometimes it doesn't. Make sure your Map DVD is clean and without fingerprints or scratches first. If it the disc is okay, the issue, unfortunately, is within the radio itself. The only correction I've seen for this problem is to replace the radio itself. Also note, that if the radio is replaced, it will have to be reprogrammed by a GM dealer to correctly set up your vehicle's options and learn the vehicle's VIN so the radio will unlock.
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