Scania DCU DTC 781 Door control unit, high voltage

DCU DCU control unit · Scania

Code 781 (decimal). Some diagnostic tools show it in hexadecimal as 030D.

In short

The supply voltage is too high (above approx. 32 V).

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

What does Scania DCU fault code 781 mean?

The supply voltage is too high (above approx. 32 V).

What causes Scania DTC 781?

- The vehicle's generated supply voltage is too high. - Fault in a generator or direct current converter. - The vehicle is connected to the starter cables with high voltage supply.

What are the symptoms?

The door has limited functionality or is completely out of order.

How to fix Scania DCU fault code 781?

  1. Check the vehicle's electric power supply and the cable harness and harness-to-harness connector to the door control unit.
  2. Check whether there are any other active fault codes in other systems in the vehicle.
  3. If the vehicle is connected to the starter cables, this fault code can be ignored.

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

Code 781 in other Scania systems

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