Scania TMS DTC 28674 The synchromesh actuating arm is not engaged, instead it returns to the disengaged position during deactivation.

TMS Transmission Management System · Scania · 2 variants

Code 28674 (decimal). Some diagnostic tools show it in hexadecimal as 7002.

In short

Freewheeling retarder cannot be engaged.

Variant 1

Applies to: TMS1

What does Scania TMS fault code 28674 mean?

What causes Scania DTC 28674?

How does the system react?

How to fix Scania TMS fault code 28674?

Read the full explanation with Premium

Causes, system reaction, symptoms and step-by-step repair instructions for every fault code are available to Premium members.

  • Full explanations of every code and brand
  • Causes, symptoms and repair steps
  • New brands and codes included
Get Premium – 7,50 € / month I already have an account

Yearly plan: pay 10 months, get 12. Cancel at any time.

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 28674 in other Scania systems