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?

Expected CAN messages from the GMS control unit are missing.

What causes Scania DTC 6401?

Fault in CAN connections, connectors or cable harness.

How does the system react?

- Yellow warning indication of an electric drive system fault is displayed. - No electric drive is possible.

What are the symptoms?

- Impaired performance when driving off. - Impaired performance when changing gears.

How to fix Scania MGU fault code 6401?

  1. Check the CAN network cable harness and connector.
  2. Check the voltage supply to the GMS control unit.

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