Scania EMD DTC 73 Engine shutdown due to too high temperature together with bad signal status in the aftertreatment system.

EMD EMD control unit · Scania

Code 73 (decimal). Some diagnostic tools show it in hexadecimal as 0049.

In short

ECU indicates that temperature in the aftertreatment system is too high.

Applies to: EMD1

What does Scania EMD fault code 73 mean?

ECU indicates that temperature in the aftertreatment system is too high.

What causes Scania DTC 73?

Fire in aftertreatment system or engine side caused by oil/fuel leakage or extra HC accumulation in the aftertreatment system.

How does the system react?

Torque reduction and engine stop after specified time with red warning lamp.

What are the symptoms?

Engine stop after specified time.

How to fix Scania EMD fault code 73?

  1. Check if there is any oil leakage in the aftertreatmet system or any broken injector.
  2. Check the turbo for possible damages

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

Code 73 in other Scania systems

Compare code 73 in every system →