Description:

This code is triggered when the resistance in the DEF tank heater coolant valve circuit is too low, typically indicating a short circuit to ground. This can cause the coolant valve to malfunction or fail, affecting the heating of the DEF tank.

Reaction:

The ECU may limit or adjust the operation of the DEF system to manage the detected fault, potentially impacting DEF injection and overall vehicle performance and emissions control.

Recommendations:

• Inspect Wiring and Connections: Check for damaged, frayed, or loose wiring and connectors in the DEF tank heater coolant valve circuit. Repair or replace as necessary.
• Test Valve Element: Use diagnostic tools to test the coolant valve element for proper resistance. Replace the valve if it is faulty.
• Check for Short Circuits: Inspect the circuit for points where wires may be touching ground, causing a short circuit. Repair or insulate as needed.
• Verify Electrical Supply: Ensure that the electrical supply to the valve is stable and within specifications.
• 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:

Ensuring the proper electrical function of the DEF tank heater coolant valve is essential for effective DEF injection, especially in cold conditions. Regular maintenance and timely repairs can help avoid resistance-related problems.