U0101 - what are the problems that can happen if this code appeared

Question

I just bought this car and it drove fine when I test drove it. When I picked up the car and left .As soon as I got it up to speed it shifted real hard and lost all power to the dash and lost power on the drive train.

Answer 1

U0101 Communication , Transmission control module

The code you have is a faulty signal, because you lost all power to the dash , you can expect U0101 to appear, when the power is loss the signal for the transmission control module is loss also, To fix this problem you need to investigae why you loss power especially to the dash