I have a 2008 C6 Corvette LS3 Auto in the shop for some simple mods and a tune. I am having an issue I have never come across before. Anytime I flash a tune into the ECM that is not the stock tune I lose the transmission. By lose the trans I mean it goes into limp mode right after an ECM flash, i cannot communicate with the TCM and it does not set any codes. This happens with a cal and a full flash. If I flash the stock tune into the ECM the transmission comes back to life and everything is fine, but only on the stock tune. I have tested and if I even change one parameter in the stock tune and flash it I lose the trans. This is driving me crazy, hoping somebody has run across this before. All my software is up to date. I have installed longtube headers and a cold air and need to get this thing tuned. Any ideas would be great. I have attached the stock ECM and TCM files
Hertz TCM.ctz
Hertz C6 LS3.ctz