Scania fault code 3156

Code 3156 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:

EMU Contactor unit R126, negative contactor, short circuit to earth or open circuit The control unit indicates too low a voltage for the negative contactor output signal. Read explanation → BMU Battery Management Unit Negative contactor, short circuit to earth or open circuit The control unit has interpreted that there is a short circuit to 24 volt voltage or an open circuit on the control signals to the contactor. Read explanation →