Description:

This error code occurs when the Diesel Exhaust Fluid (DEF) tank fluid temperature signal exceeds the upper limit, likely due to a short to 12 volts. This may result in incorrect temperature readings, affecting DEF fluid management and emission control systems.

Reaction:

The control system may take corrective actions based on erroneous high temperature readings, potentially affecting DEF usage and emission reductions.

Recommendations:

• Inspect Temperature Sensor and Wiring: Check the DEF tank temperature sensor and associated wiring for signs of damage or shorts to power sources.
• Measure Sensor Voltage: Confirm the voltage at the temperature sensor matches the expected specifications. High voltage readings indicate a short to 12 volts.
• Replace Damaged Sensor or Wiring: Correct any electrical issues found during the inspection by repairing or replacing the temperature sensor or wiring.
• Reset ECU and Re-calibrate System: After repairs, reset the ECU to clear the fault and recalibrate the system to ensure accurate temperature readings.

Note:

Accurate DEF temperature measurement is essential for proper DEF fluid management and compliance with emission standards. Regular checks can prevent errors that might lead to emission system failures.