Description:

This error code occurs when the DEF dosing injector is activated, but no corresponding pressure drop is detected in the DEF system, suggesting a malfunction in injection despite the injector being open.

Reaction:

The ECU might log this as a fault and initiate diagnostics or safe-mode operations to prevent potential damage to the aftertreatment system from incorrect DEF dosing.

Recommendations:

• Inspect DEF Supply and Pressure System: Ensure there is adequate DEF fluid and check for clogs or leaks in the supply line.
• Test Injector and Pressure Sensors: Verify that the injector is opening correctly and that pressure sensors are accurately measuring DEF pressure.
• Check for Injector Leaks or Blockages: Look for any signs of leaks or blockages that would prevent fluid from being injected even though the injector is activated.
• Reset ECU and Re-test System: After troubleshooting and repairs, reset the ECU to clear the fault and conduct a comprehensive test to confirm the issue is resolved.

Note:

Proper function of the DEF dosing injector is crucial for maintaining regulatory compliance and ensuring the effectiveness of the emission control system. Immediate attention to discrepancies in injector performance is critical to avoid emissions violations and potential system damage.