Originally Posted by
blindsquirrel
You can't turn a 2014 TCM OS into a 2013 OS with a segment swap, the OS IDs have to be the same and if they were the same they'd already be the same year.
What diagnosis has led you to the conclusion that a ECM/TCM mismatch is the cause of your issue?
Does it work normal in P/R/N/D but never shifts out of first gear when driven? Or is it a 'stuck in first gear' thing, like all the time regardless of gear selection? Because if it's that second one, it is a mechanical issue in the trans.