New to the whole tuning thing especially with the hptuner, installed a new rebuilt transmission from a company called "Whatever It Takes" and bought the tuner from them knowing I was going to have to program the TCM.
so got everything set up for the tuner and then plugged it into the truck, then read the vehicle, afterwards we went to where it said to write the program and the only things it will allow me to reprogram is the ecm and some kind of ccm thing but nothing for a tcm. So my question is does this already have a program done in it or do i need to find some tune and install that? Thanks Mike
Vehicle is a 2015 GMC Sierra 5.3 4wd