Scania DDU DTC 796 HMS control unit, no CAN communication

DDU DDU control unit · Scania

Code 796 (decimal). Some diagnostic tools show it in hexadecimal as 00031C.

In short

The DDU control unit is not receiving CAN messages from the HMS control unit.

Applies to: DDU1 (DDU)

What does Scania DDU fault code 796 mean?

The DDU control unit is not receiving CAN messages from the HMS control unit.

What causes Scania DTC 796?

- The HMS control unit is not connected to the cable harness for CAN communication. - The fuse for the HMS control system has tripped. - Fault in the coordinator.

How does the system react?

Red warning indication of a hybrid powertrain fault is displayed.

How to fix Scania DDU fault code 796?

  1. Check the cable harnesses and harness-to-component connectors.
  2. Check the fuse for the TMS control system.
  3. Check and rectify fault codes for the coordinator and the TMS control system.

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

Code 796 in other Scania systems

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