Description:

This code indicates that the DEF concentration sensor has encountered a communication problem, likely due to a failure in the sensor itself or in the communication pathways between the sensor and the ECU. This interruption can result in the inability to monitor DEF quality properly.

Reaction:

The ECU may default to a predetermined DEF dosing strategy or restrict engine performance to ensure emissions remain within acceptable limits without reliable DEF concentration data.

Recommendations:

• Check Wiring and Connections: Inspect all associated wiring and connectors for damage or disconnections that could be causing communication issues.
• Test Sensor and Circuit: Use diagnostic equipment to test both the functionality of the sensor and the integrity of the communication circuit.
• Replace Faulty Components: If testing confirms a fault in the sensor or wiring, replace the defective parts.
• Reset ECU and Verify Communication: After repairs, reset the ECU to ensure it recognizes the sensor and test the system to confirm that communication has been restored.

Note:

Reliable communication between the DEF concentration sensor and the ECU is crucial for optimal emission control system performance. Prompt attention to communication errors can prevent more significant issues.