Okay, what is the brand code reader you got?
Some of them will not read anything but engine codes. They will not read any other system.
A quick test you can do is this. Run it up to 55 MPH and with your foot on the gas, let the other one touch the brake pedal and see if the transmission downshift.
If it does, then it was in overdrive. If it does not downshift, it will not change at all.
Monday, June 29th, 2020 AT 5:26 PM