Have a new Terrain Denali with non-functional navigation. Took to dealer and they said card needed to "cleaned off". They did and NAV still does not work. Should have confirmed repair before driving 300 miles away. Get this pictured message when I try to run Navigation. "This SD card is not valid in this vehicle for navigation. Please refers to the owner's portal website.... " Car was inherited and has only 2400 miles. Taking to another dealer to service it before selling. Any ideas on what is really wrong. Appreciate any help. I would like to understand issue before seeing 'another' GMC dealer to 'repair'.
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