Scania EMU DTC 8459 Coolant pump M524, low impeller speed

EMU EMU control unit · Scania

Code 8459 (decimal). Some diagnostic tools show it in hexadecimal as 00210B.

In short

The coolant pump detects a lower impeller speed than expected.

Applies to: EMU1 (ECS)

What does Scania EMU fault code 8459 mean?

What causes Scania DTC 8459?

How does the system react?

What are the symptoms?

How to fix Scania EMU fault code 8459?

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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.