Scania CUV DTC 647 Switch module S139

CUV Visibility system · Scania

Code 647 (decimal). Some diagnostic tools show it in hexadecimal as 0287.

In short

The control unit interprets the signal from switch module S139 as implausible.

Applies to: CUV2CUV3 (VIS)

What does Scania CUV fault code 647 mean?

The control unit interprets the signal from switch module S139 as implausible.

What causes Scania DTC 647?

The rotary switch for lighting is between two valid positions.

What are the symptoms?

Safety lighting consisting of position light and dipped beam is activated.

How to fix Scania CUV fault code 647?

  1. Check that the rotary switch for lighting is in a valid position.
  2. Check the fuse for switch module S139.
  3. Check the connections and cable harness for switch module S139.
  4. If the fault persists, renew switch module S139.

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

Code 647 in other Scania systems

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