Scania ALLISON DTC 1844 Incorrect gear ratio on 4th gear

ALLISON Allison automatic gearbox · Scania

Code 1844 (decimal). Some diagnostic tools show it in hexadecimal as 0734.

In short

Actual 4th gear ratio does not agree with the calculated 4th gear ratio.

Applies to: A4

What does Scania ALLISON fault code 1844 mean?

What causes Scania DTC 1844?

How does the system react?

How to fix Scania ALLISON fault code 1844?

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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 1844 in other Scania systems