Scania EMS DTC 49921 Unit injector for cylinder 4

EMS Engine Management System · Scania · 3 variants

Code 49921 (decimal). Some diagnostic tools show it in hexadecimal as C301.

In short

It has not taken as long as expected for the control unit to build up the current in the solenoid valve.

Variant 1

Applies to: EMS S6EMS S6 (EMS S6 EuroIII)

What does Scania EMS fault code 49921 mean?

What causes Scania DTC 49921?

How does the system react?

How to fix Scania EMS fault code 49921?

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.

Variant 2

Applies to: EMS S6 IoM singlespeed (S6IM)

Variant 3: Incorrect combination of EMS and OCS

Applies to: EMS S8

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

Code 49921 in other Scania systems

Compare code 49921 in every system →