Downshifting 2013 Volkswagen Passat

passat
volkswagen

#1

2013 VW Passatt 3.6 liter. Transmission started downshifting on its on with wrench light on panel. When I stop car, turn off engine and restart, car drives ok for a while then downshifts again. Whats the problem.


#2

You will need to have it diagnosed. The car’s onboard computer controls the transmission. The computer (PCM) is probably at fault. The wrench light indicates a problem.

A power-train control module, abbreviated PCM, is an automotive component, a control unit, used on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).