Description:

This diagnostic trouble code indicates that the temperature of the Diesel Exhaust Fluid (DEF) dosing unit heater outlet is moderately low. This can impact the proper functioning of the DEF dosing unit by causing the DEF fluid to be less effective in reducing emissions.

Reaction:

The ECU may limit or adjust the operation of the DEF dosing unit heater to manage the moderately low temperature and ensure safe operation of the emissions control system.

Recommendations:

• Inspect DEF Dosing Unit Heater: Check for any signs of damage or wear on the DEF dosing unit heater. Replace if necessary.
• Check Electrical Supply: Ensure that the electrical supply to the DEF dosing unit heater is stable and within specifications.
• Test Heater Function: Use diagnostic tools to test the DEF dosing unit heater for proper operation and temperature output. Replace the heater if it is not functioning correctly.
• Verify Temperature Sensors: Ensure that the temperature sensors associated with the DEF dosing unit are functioning correctly and providing accurate readings.
• Monitor Operating Conditions: Review the operating conditions that might contribute to low DEF heater temperature, such as extreme cold weather.
• Reset ECU and Monitor System: After resolving the issue, reset the ECU to clear the fault code and monitor the system to ensure normal operation.

Note:

Maintaining the proper temperature of the DEF dosing unit heater is crucial for effective DEF dosing and emissions control. Regular inspections and timely maintenance can help prevent temperature-related issues.