Description:

This diagnostic trouble code is set when the pressure in the Diesel Exhaust Fluid (DEF) dosing unit is detected to be extremely low. Low pressure can prevent the correct amount of DEF from being injected, reducing the effectiveness of the emission control system.

Reaction:

The ECU may issue warnings or limit the operation of the DEF system to maintain emissions compliance, potentially affecting overall vehicle performance.

Recommendations:

• Inspect DEF Dosing Unit: Check the dosing unit for leaks, blockages, or malfunctions that could cause low pressure. Repair or replace components as necessary.
• Verify DEF Supply: Ensure that the DEF tank is adequately filled and that there are no blockages in the supply lines.
• Check Pump Operation: Test the DEF pump to ensure it is operating correctly and providing the necessary pressure.
• Test Pressure Sensors: Verify that the pressure sensors are providing accurate readings and replace them if they are faulty.
• Reset ECU and Monitor: After resolving the low pressure issue, reset the ECU to clear the fault code and monitor the system to ensure it maintains the correct pressure.

Note:

Proper pressure in the DEF dosing unit is crucial for effective DEF injection and maintaining the efficiency of the aftertreatment system. Regular inspections and maintenance can help prevent low pressure issues.