Scania fault code 3157
Code 3157 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMU
Contactor unit R126, negative contactor, contactor fixed in closed position
The control unit indicates that the negative contactor is stuck in the closed position.
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BMU Battery Management Unit
Negative contactor, stuck in closed position
The control unit has interpreted that the contactor is stuck in the closed position when the open position has been requested.
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