15 Sierra 6.2L. Flashed in tune files vehicle started then died and now I can?t communicate with the ECU and am getting detect protocol failed message. Tried resyncing device multiple times and no change. Any ideas? Tried another scan tool I have and it can?t detect the vin.
Double check to make sure the cable lights up without being plugged into the laptop.. just the car.
Tuner at PCMofnc.com
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