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Yes all input voltages are good grounds good id make a bet that the TCM is out again, but don't know what has caused it again. This is a government deal to the city, and i keep telling them need to find someone that knows something about them. I was with GM for over forty years but some of the...

I have a 2015 M997 when we first got it a couple of years ago it was fine for about 6 months, then trans went in to default light came on. While diagnosing the problem the trans control module felt a little warmer than i thought it should and it would just blink code 12. replaced the control...