Scania MGU DTC 6401 GMS control unit, no CAN communication

MGU MGU control unit · Scania

Code 6401 (decimal). Some diagnostic tools show it in hexadecimal as 1901.

In short

Expected CAN messages from the GMS control unit are missing.

Applies to: MGU2MGU2 (MGU2X)MGU2 (MGUC2)MGU2 (MGUC2X)

What does Scania MGU fault code 6401 mean?

What causes Scania DTC 6401?

How does the system react?

What are the symptoms?

How to fix Scania MGU fault code 6401?

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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 6401 in other Scania systems