Scania BMU DTC 3099 Contactor, supply voltage too low

BMU Battery Management Unit · Scania

Code 3099 (decimal). Some diagnostic tools show it in hexadecimal as 000C1B.

In short

The contactor supply voltage is lower than expected when the contactor is activated.

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 3099 mean?

What causes Scania DTC 3099?

How does the system react?

What are the symptoms?

How to fix Scania BMU fault code 3099?

Read the full explanation with Premium

Causes, system reaction, symptoms and step-by-step repair instructions for every fault code are available to Premium members.

  • Full explanations of every code and brand
  • Causes, symptoms and repair steps
  • New brands and codes included
Get Premium – 7,50 € / month I already have an account

Yearly plan: pay 10 months, get 12. Cancel at any time.

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

Code 3099 in other Scania systems