Scania MGU DTC 6656 CAN communication, incorrect data

MGU MGU control unit · Scania

Code 6656 (decimal). Some diagnostic tools show it in hexadecimal as 1A00.

In short

Incorrect or unreliable data in the received CAN message.

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

What does Scania MGU fault code 6656 mean?

Incorrect or unreliable data in the received CAN message.

What causes Scania DTC 6656?

- Interference in CAN communication between the GMS control unit and the MGU control unit. - The GMS control unit software and MGU control unit software are not compatible.

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 6656?

  1. Check and rectify any fault codes that have been generated in the GMS control unit.
  2. Check that the software in the GMS control unit and the MGU control unit are compatible.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 6656 in other Scania systems

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