Scania ZF DTC 8421 Checksum

ZF ZF gearbox · Scania

Code 8421 (decimal). Some diagnostic tools show it in hexadecimal as 20E5.

In short

Internal control unit fault.

Applies to: ZF1

What does Scania ZF fault code 8421 mean?

What causes Scania DTC 8421?

How to fix Scania ZF fault code 8421?

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.