Scania TMS DTC 688 The bus powertrain has no cable harness

TMS Transmission Management System · Scania · 3 variants

Code 688 (decimal). Some diagnostic tools show it in hexadecimal as 02B0.

In short

The control unit indicates that the software is configured to communicate via the safety bus but the cable harness is missing.

Variant 1

Applies to: TMS3 (TMS)TMS6 (TMS)

What does Scania TMS fault code 688 mean?

What causes Scania DTC 688?

How does the system react?

What are the symptoms?

How to fix Scania TMS fault code 688?

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Variant 2: Different chassis serial numbers in BMU control unit and gearbox control unit

Applies to: TMS4 (TMS)

Variant 3: Different chassis serial numbers in BMU control unit and gearbox control unit

Applies to: TMS5 (TMS)

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

Code 688 in other Scania systems

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