Hello everyone. I have never used an Autocal before. Bought one new off of eBay from a "smaller tuner." Has an 80hp tune along with a Transmission tune. Transmission flashed without issue at all, however I cannot for the life of me get the 80hp tune to flash. Keep getting error code $0331. Followed the instructions to a T. When I go to program full, and click on A First File, it doesn't ask me to License ECU, it just says to turn ignition off now. Then when I go to program Cal and click on the 80 tune, it says flashing 0% and pulls up the 0331 error code. The tuning company as been little to no help, says that is a generic code and to keep trying it should go thru. I've tried many, many, many times. Hooked up battery charger, pulled radio fuse....same result. Truck is a 2015 GMC Denali HD Duramax. Any help would be GREATLY appreciated!