Scania ALLISON DTC 49971 Incompatible secondary drive mode selector

Q: What does Scania ALLISON fault code 49971 mean?

Incompatible secondary drive mode selector. The drive mode selector is not an Allison J1939 drive mode selector or is not an approved OEM drive mode selector. Code 49971 (decimal). Some diagnostic tools show it in hexadecimal as C333.

ALLISON Allison automatic gearbox · Scania

Code 49971 (decimal). Some diagnostic tools show it in hexadecimal as C333.

In short

The drive mode selector is not an Allison J1939 drive mode selector or is not an approved OEM drive mode selector.

Applies to: A4

What does Scania ALLISON fault code 49971 mean?

The drive mode selector is not an Allison J1939 drive mode selector or is not an approved OEM drive mode selector.

What causes Scania DTC 49971?

- Incorrect drive mode selector. - Incorrect calibration in the control unit.

How does the system react?

The Allison fault code number is: U0333. The fault code is set when the drive mode selector has detected that the drive mode selector is not an Allison J1939 or that it is not an approved OEM drive mode selector. The control unit ignores the information from the drive mode selector. The control unit shuts off gear changing adaptation. The fault code is cleared automatically when the vehicle has completed 40 start-up cycles without the fault being detected again.

How to fix Scania ALLISON fault code 49971?

Contact an Allison dealer.

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