EMU 4171 Scania Heater H39, main transistor, electrical fault

EMU EMU control unit · Scania

Code 4171 (decimal). Some diagnostic tools show it in hexadecimal as 00104B.

In short

The control system has measured current of over 500 mA while the PWM signal to both batteries is low.

Applies to: EMU1 (ECS)

What does Scania EMU fault code 4171 mean?

What causes Scania DTC 4171?

How does the system react?

What are the symptoms?

How to fix Scania EMU fault code 4171?

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.

Code 4171 in other Scania systems

Compare code 4171 in every system →