Description:

This code is triggered when the DEF dosing unit signal is out of range low, indicating a short to ground. Such a condition can prevent the DEF dosing unit from functioning correctly, impacting DEF injection and overall aftertreatment system performance.

Reaction:

The ECU may limit the operation of the DEF system or issue warnings to prevent potential damage, affecting vehicle performance and emissions compliance.

Recommendations:

• Inspect Wiring and Connections: Check for any damaged, frayed, or loose wiring and connectors that might cause a short to ground. Repair or replace as necessary.
• Test DEF Dosing Unit Components: Use diagnostic tools to test the DEF dosing unit and associated components for proper operation.
• Check for Contaminants: Ensure there are no contaminants in the DEF system that could cause electrical shorts.
• Replace Faulty Components: If a specific component, such as a sensor or control module, is found to be faulty, replace it.
• Reset ECU and Verify Operation: After resolving the issue, reset the ECU to clear the fault code and verify that the DEF dosing unit operates correctly.

Note:

Ensuring the proper electrical function of the DEF dosing system is essential for effective emissions control. Regular maintenance and timely repairs can help avoid signal-related problems.