Scania RET DTC 28676 The synchromesh actuating arm cannot be engaged.

RET Retarder · Scania

Code 28676 (decimal). Some diagnostic tools show it in hexadecimal as 7004.

In short

Freewheeling retarder cannot be engaged due to repeated oil pressure surges.

Applies to: OPC5 (RET2)

What does Scania RET fault code 28676 mean?

What causes Scania DTC 28676?

How does the system react?

How to fix Scania RET fault code 28676?

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

Code 28676 in other Scania systems