Can someone explain to me what I am missing. I changed a few things in my stock file that I saved a copy of. The things I changed were at what temp I had the fan come on for ECT and TFT. I tried to write that tune to the truck but it failed. So i put it back to the stock file and it was successful. So then I just tried changing one parameter. I changed the rise temp threshold for the transmission from 240 to 205 saved the file and tried write again but it failed. So I went back to the stock file.