Scania EMU DTC 37121 ML 3/2-way valve supply, data erratic, intermittent or incorrect in ECU

EMU EMU control unit · Scania

Code 37121 (decimal). Some diagnostic tools show it in hexadecimal as 009101.

In short

ECU internal circuit detects a fault in the driver HW in the ECU

Applies to: EMU1 (ECS)

What does Scania EMU fault code 37121 mean?

What causes Scania DTC 37121?

How does the system react?

How to fix Scania EMU fault code 37121?

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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.