Scania TMS DTC 28678 Retarder oil pressure

TMS Transmission Management System · Scania · 2 variants

Code 28678 (decimal). Some diagnostic tools show it in hexadecimal as 7006.

In short

Engagement of the freewheeling retarder is stopped if retarder oil pressure is too high so as not to damage the synchroniser.

Variant 1

Applies to: TMS1

What does Scania TMS fault code 28678 mean?

What causes Scania DTC 28678?

How does the system react?

How to fix Scania TMS fault code 28678?

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Variant 2

Applies to: TMS2 (TMS)

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

Code 28678 in other Scania systems