Scania ZF DTC 4621 Drive mode selector

ZF ZF gearbox · Scania

Code 4621 (decimal). Some diagnostic tools show it in hexadecimal as 120D.

In short

Faulty signal from the drive mode selector.

Applies to: ZF1

What does Scania ZF fault code 4621 mean?

Faulty signal from the drive mode selector.

What causes Scania DTC 4621?

No signal in the CAN communication.

How does the system react?

Invalid fault code.

How to fix Scania ZF fault code 4621?

  1. Clear the fault code.
  2. Renew the gearbox control unit if the fault code is generated again.

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

Code 4621 in other Scania systems