Scania DCU DTC 522 Communication, brown CAN bus (CAN1)

DCU DCU control unit · Scania

Code 522 (decimal). Some diagnostic tools show it in hexadecimal as 020A.

In short

No communication on the brown CAN bus.

Applies to: DCU3 (DCUA)DCU3 (DCUF)DCU3 (DCUM)DCU3 (DCUR)

What does Scania DCU fault code 522 mean?

No communication on the brown CAN bus.

What causes Scania DTC 522?

Fault in the cable harness or harness-to-component connector for brown CAN bus: - Short circuit between CAN High (CN3-7) and CAN Low (CN3-8). - Short circuit between CAN High and voltage supply. - Short circuit between CAN High and earth. - Short circuit in between CAN Low and voltage supply. - Short circuit between CAN Low and earth. Fault in one of the control units on the brown CAN bus.

How does the system react?

Functions that depend on information from the brown CAN bus are degraded.

What are the symptoms?

The system communicating with the brown CAN bus is not functioning correctly.

How to fix Scania DCU fault code 522?

  1. Check the CAN bus cable harnesses and harness-to-harness connectors.
  2. Check that there is no external damage on the cable harness and harness-to-harness connector.

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

Code 522 in other Scania systems

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