Scania BMU DTC 639 Fault in propulsion battery power supply

BMU Battery Management Unit · Scania

Code 639 (decimal). Some diagnostic tools show it in hexadecimal as 027F.

In short

Too much deviation in the propulsion battery's internal power supply.

Applies to: BMU6 (RES)BMU6 (RESXA)BMU6 (RESXB)BMU6 (RESXC)BMU6 (RESXD)BMU6 (RESXE)BMU6 (RESXF)BMU6 (RESXG)BMU6 (RESXH)BMU6 (RESXI)BMU6 (RESXJ)BMU6 (RESXK)

What does Scania BMU fault code 639 mean?

What causes Scania DTC 639?

How does the system react?

What are the symptoms?

How to fix Scania BMU fault code 639?

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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 639 in other Scania systems

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