Scania ALLISON DTC 2421 Gear changing solenoid SS2, open circuit

ALLISON Allison automatic gearbox · Scania

Code 2421 (decimal). Some diagnostic tools show it in hexadecimal as 0975.

In short

The control unit has detected an open circuit in the SS2 solenoid return circuit.

Applies to: A4

What does Scania ALLISON fault code 2421 mean?

What causes Scania DTC 2421?

How does the system react?

How to fix Scania ALLISON fault code 2421?

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.

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