Scania BMU DTC 3131 Negative contactor, open incorrectly

BMU Battery Management Unit · Scania

Code 3131 (decimal). Some diagnostic tools show it in hexadecimal as 000C3B.

In short

The negative contactor is incorrectly open even though it has not been requested.

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 3131 mean?

What causes Scania DTC 3131?

How does the system react?

How to fix Scania BMU fault code 3131?

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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.