Scania BMU DTC 3156 Negative contactor, short circuit to earth or open circuit

BMU Battery Management Unit · Scania

Code 3156 (decimal). Some diagnostic tools show it in hexadecimal as 000C54.

In short

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.

Applies to: BMU7 (BMUA)BMU7 (BMUB)BMU7 (BMUC)BMU7 (BMUD)BMU7 (BMUE)BMU7 (BMUF)BMU7 (BMUG)BMU7 (BMUH)BMU7 (BMUI)BMU7 (BMUJ)BMU7 (BMUK)BMU7 (BMUL)BMU7 (BMUM)BMU7 (BMUN)BMU7 (BMUO)BMU7 (BMUP)

What does Scania BMU fault code 3156 mean?

What causes Scania DTC 3156?

How does the system react?

How to fix Scania BMU fault code 3156?

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This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 3156 in other Scania systems