01 sierra diablosport

[Chrishulsey22]

I have a Diablo tune on my truck from the i3. For some reason the tuner quit working is just a black screen when I plug it in not sure if one of my kids stepped on it in the backseat or what. But I’m trying to figure out the best way I’d get the truck back to the stock tune if I can’t get the tuner back on I can’t load the stock file. Anything helps, thanks. 

[CamGTP]

If the computer isn't locked down, which I'm not sure if that tuner locks those calibrations. You will have to have a dealership flash it with the VIN/Calibration OS that matches yours.

 

Or have someone with a dealer level scan tool and a subscription service to the GM site, then flash the truck that way.