Scania BMU DTC 661 The heater is overheated

BMU Battery Management Unit · Scania · 2 variants

Code 661 (decimal). Some diagnostic tools show it in hexadecimal as 0295.

In short

The heater temperature sensor has detected a temperature which is too high on three consecutive attempts to start the heater.

Variant 1

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 661 mean?

What causes Scania DTC 661?

How does the system react?

What are the symptoms?

How to fix Scania BMU fault code 661?

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Variant 2

Applies to: BMU5

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

Code 661 in other Scania systems

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