Scania EMS DTC 65523 Verification between engine control unit and coordinator

EMS Engine Management System · Scania · 2 variants

Code 65523 (decimal). Some diagnostic tools show it in hexadecimal as FFF3.

In short

Verification between engine control unit and coordinator has not been successful.

Variant 1

Applies to: EMS S6EMS S6 (EMS S6 EuroIII)

What does Scania EMS fault code 65523 mean?

Verification between engine control unit and coordinator has not been successful.

What causes Scania DTC 65523?

A fault occurred when the coordinator tried to verify whether a new starter key has been initialised. The engine control unit is not unlocked, which is necessary when a new starter key is initialised.

How does the system react?

The engine cannot be started when the fault code is active. The starter motor is blocked and the fuel supply is shut off.

How to fix Scania EMS fault code 65523?

  1. Troubleshoot via the coordinator.
  2. The only measure that needs to be taken is to clear the fault code if no fault codes have been generated in the coordinator and the driver does not notice any malfunctions.
  3. After completed troubleshooting, clear the fault code memory in the motor steering unit and check afterwards if the fault code returns.

Variant 2

Applies to: EMS S6 IoM singlespeed (S6IM)

Detection

Verification between engine control unit and coordinator has not been successful.

Possible cause

A fault occurred when the coordinator tried to verify whether a new starter key has been initialised. The engine control unit is not unlocked, which is necessary when a new starter key is initialised.

System reaction

The engine cannot be started when the fault code is active. The starter motor is blocked and the fuel supply is shut off. This fault code may also cause fault code 58880 to be generated as a subsequent fault.

How to fix

  1. Troubleshoot via the coordinator.
  2. The only measure that needs to be taken is to clear the fault code if no fault codes have been generated in the coordinator and the driver does not notice any malfunctions.
  3. After completed troubleshooting, clear the fault code memory in the motor steering unit and check afterwards if the fault code returns.

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