Originally Posted by
Haulinbass02
Guys I?m having issues writing a tuned file to my 05 Excursion. It stops part of the way thru with error ?writer transfer x7f negative?. This caused a no-start/turn over it I was able to get the truck back by flashing the factory file, which it did without issue. The TCM was another problem. Same error code and it took MULTIPLE tries with the factory file for it to flash the factory file back.
I?ve tried small changes and it does the same thing.
Tech support said it is a battery voltage/wiring related issue but I?m not sure what all could be going on. Batteries a fairly new and always have a good charge. Why would it not take the tuned file but flash the factory ECM file no problem?
I?m wondering if the glow plug controller is pulling too much being that the key is on that long? I know it cycles on and off. FICM? Could any of those be causing voltage fluctuation problems?
What gives?