Nige
Senior Member
If you do find out what it is and where it came from be sure to come back and tell us.Well thanks for your help guys hopefully figure something out.
Time to break out the pressure gauges I think.
Or maybe first try a full calibration of all five transmission clutch solenoid valves if you have access to ET. Apparently you can also perform the calibration using the Advisor Panel (procedure is in SIS) but I have never done it that way.