Scania EMU DTC 4189 Refrigerant compressor E157, internal fault

EMU EMU control unit · Scania

Code 4189 (decimal). Some diagnostic tools show it in hexadecimal as 00105D.

In short

The refrigeration compressor reports VCB voltage is too low (below 450 V).

Applies to: EMU1 (ECS)

What does Scania EMU fault code 4189 mean?

What causes Scania DTC 4189?

How does the system react?

What are the symptoms?

How to fix Scania EMU fault code 4189?

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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 4189 in other Scania systems