Scania EMU DTC 4220 Heater H39, low voltage

EMU EMU control unit · Scania

Code 4220 (decimal). Some diagnostic tools show it in hexadecimal as 00107C.

In short

The heater is reporting a voltage below 450 V.

Applies to: EMU1 (ECS)

What does Scania EMU fault code 4220 mean?

What causes Scania DTC 4220?

How does the system react?

What are the symptoms?

How to fix Scania EMU fault code 4220?

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

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.

Code 4220 in other Scania systems

Compare code 4220 in every system →