Scania ALLISON DTC 557056 30 voltage control unit, incorrect shut off

ALLISON Allison automatic gearbox · Scania · 2 variants

Code 557056 (decimal). Some diagnostic tools show it in hexadecimal as 088000.

In short

The battery voltage disappears before the shutdown process is completed and the engine still is running.

Variant 1

Applies to: A5

What does Scania ALLISON fault code 557056 mean?

What causes Scania DTC 557056?

How does the system react?

How to fix Scania ALLISON fault code 557056?

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Variant 2: Control unit 30 voltage, incorrect shutdown

Applies to: A6

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