I have a 2014 386 with the Nav option. I don't use it anymore because my usb port was trash when I bought the truck. When it quit working I bought a 7" Garman Deisel Nav that works great. What I think would be your solution is to erase the present program before you try to install the update. That is what I have to do to update my Garman Deisel that I bought at Pilot.
Good luck.
Factory "SmartNav" Garmin Map Update
Discussion in 'Peterbilt Forum' started by jamie21091, Jul 22, 2017.
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