This is my second LBZ and probably the 10th-12th vehicle I've read and written tunes to since 2012 ish and this is the first time I've ever encountered this issue.
The truck was tuned when I bought it, no idea who tuned it. Bought the truck in Kansas and I live in Texas so long shot of finding the original tuner.
I was able to read the tune and save the file and send it off to the guy that has done my tuning for 10+ years, he sent me back a new tune file to write in. Bought my credits since he used his own file rather than whatever was on the truck, went to write the tune and it froze at 7.7% and then failed. This was with a write entire, as I wasnt sure if the OS was changing or not, I just wanted a fresh clean slate.
I've tried pulling fuses, making sure both batteries are completely charged up, new cable for my MPVI to PC, same story. Always fails at 7.7%. That is, when it doesnt give me the x7F error code.
Write calibration only does nothing.
There is no option or tick box to turn off high speed write anymore, at least that I can see or find.
I'm really trying to avoid having my truck towed into a stealership in hopes that they can flash the ECM back to factory but I am out of ideas so I was hoping someone here might have another solution I can try before resulting to towing it on Monday.
More notes, no after market radio, alarm, remote start etc etc. The only aftermarket electrical component on the truck is a FASS Lift Pump but I have pulled the fuse for that so it doesnt run constantly while the key is on.
Thanks in advance!