WOMS
P code powertrain Medium severity

P205E Reductant Tank Temperature Sensor Circuit Intermittent/Erratic

The OBD2 code P205E indicates that there is an intermittent or erratic issue with the reductant tank temperature sensor circuit, which monitors the temperature of the diesel exhaust fluid (DEF) in the tank

Definition

The OBD2 code P205E indicates that there is an intermittent or erratic issue with the reductant tank temperature sensor circuit, which monitors the temperature of the diesel exhaust fluid (DEF) in the tank

Common causes

  • Faulty reductant tank temperature sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Corrosion or contamination in connectors
  • Faulty engine control module (ECM) or software issues
  • Temperature sensor calibration issues

Common misdiagnoses

  • Faulty Reductant Tank Temperature Sensor
  • Wiring issues or short circuits
  • Faulty Engine Control Module (ECM)
  • Incorrectly diagnosed fuel system issues
  • Misinterpretation of related OBDII codes
  • Faulty connectors or terminals
  • Issues with the reductant pump
  • Problems with the exhaust aftertreatment system
  • Low reductant fluid level
  • Temperature-related issues in the tank or surrounding components

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect the Reductant Tank Temperature Sensor

    Locate the reductant tank temperature sensor and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly connected and that the wiring harness is intact

  4. 4. Test the Sensor

    Use a multimeter to test the resistance of the temperature sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  5. 5. If the readings are outside the specified range, the sensor may be faulty and should be replaced

  6. 6. Check the Wiring and Connectors

    Inspect the wiring and connectors leading to the reductant tank temperature sensor for any signs of wear, fraying, or corrosion

  7. 7. Repair or replace any damaged wiring or connectors as necessary

  8. 8. Check for Ground Issues

    Ensure that the sensor has a good ground connection. A poor ground can cause erratic readings

  9. 9. Use a multimeter to check for continuity between the sensor ground and the vehicle chassis

  10. 10. Inspect the Reductant Tank

    Check the reductant tank for any signs of contamination or damage that could affect the sensor's operation

  11. 11. Ensure that the DEF fluid level is adequate and that the fluid is not frozen or contaminated

  12. 12. Clear the Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code reappears. Monitor the performance of the DEF system during the drive

  14. 14. Check for Software Updates

    Consult the manufacturer’s service bulletins to see if there are any software updates or recalls related to the reductant system that may address the issue

  15. 15. Consult a Professional

    If the problem persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with diesel exhaust systems and OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P205E code