Have a 08 acadia with Nav. Problem started with intermintent "Unable to read DVD error" for Nav. Took out disk, cleaned, replaced and worked for a while. Eventually this solution did not work, purchased new nav disk, still didn't work. Had to dealer 2 times for reprograming, no help. Told by dealer, need a new radio, Nav, the whole system. To the tune of $1100 as I am out of warrenty. I have seen on the various forums that this is a common problem, but no fixes. Any help?
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