Is there a separate transmission control module?
There may be electronics built into the transmission which talk with the engine controls (or everything could be in the engine controller = powertrain controller).
It's separate. I love done a lot of tests to rule out that I fried the TCM. I found the part online to purchase. A nice little disconnect and put in a new one. I cannot find where the wires are tracing back to for the TCM though! For the life of me I just can't find its location!