Scania BMU DTC 774 Coolant pump (M38/M82) in the propulsion battery cooling system is not behaving properly

BMU Battery Management Unit · Scania · 2 variants

Code 774 (decimal). Some diagnostic tools show it in hexadecimal as 0306.

In short

The coolant pump in the propulsion battery cooling system is not responding correctly to a request.

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 774 mean?

What causes Scania DTC 774?

How does the system react?

What are the symptoms?

How to fix Scania BMU fault code 774?

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.

Variant 2: Incorrect behaviour of the coolant pump of the propulsion battery cooling system

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 774 in other Scania systems

Compare code 774 in every system →