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P2027 Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit High Voltage

The OBD2 code P2027 indicates that the fuel vapor temperature sensor circuit in the evaporative emissions system is detecting a high voltage condition, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P2027 indicates that the fuel vapor temperature sensor circuit in the evaporative emissions system is detecting a high voltage condition, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty fuel vapor temperature sensor
  • Open or shorted wiring in the sensor circuit
  • Poor electrical connections or corroded connectors
  • Faulty engine control module (ECM)
  • High resistance in the sensor circuit
  • Incorrectly installed or damaged sensor
  • Issues with the EVAP system, such as leaks or blockages

Common misdiagnoses

  • Faulty fuel vapor temperature sensor
  • Wiring issues or shorts in the sensor circuit
  • Faulty engine control module (ECM)
  • Evaporative emissions system leaks
  • Incorrectly installed or damaged fuel tank
  • Issues with the fuel cap or seal
  • Other EVAP system component failures (e.g., purge valve, vent valve)

Troubleshooting steps

  1. 1. Read the Codes

    Use an OBD-II scanner to confirm the P2027 code and check for any additional codes that may provide more context about the issue

  2. 2. Visual Inspection

  3. 3. Inspect the wiring and connectors associated with the fuel vapor temperature sensor for any signs of damage, corrosion, or loose connections

  4. 4. Look for any frayed wires, broken connectors, or signs of wear that could cause a short circuit or high resistance

  5. 5. Check the Sensor

  6. 6. Locate the fuel vapor temperature sensor and inspect it for physical damage

  7. 7. If possible, test the sensor's resistance with a multimeter according to the manufacturer's specifications. Compare the readings to the expected values

  8. 8. Test the Circuit

  9. 9. With the ignition on (engine off), use a multimeter to check the voltage at the sensor connector. You should see a voltage reading that is within the manufacturer's specified range

  10. 10. Check for ground continuity at the sensor connector. A poor ground can lead to high voltage readings

  11. 11. Check for Short Circuits

  12. 12. Inspect the wiring harness for any signs of short circuits to power or ground. A short to power can cause the sensor to read high voltage

  13. 13. Use a multimeter to check for continuity between the sensor wire and the power source

  14. 14. Inspect the Engine Control Module (ECM)

  15. 15. If the sensor and wiring appear to be in good condition, the issue may lie within the ECM. Check for any software updates or known issues with the ECM related to the P2027 code

  16. 16. If necessary, perform a reset of the ECM by disconnecting the battery for a few minutes, then reconnecting it

  17. 17. Replace the Sensor

  18. 18. If the sensor is found to be faulty based on your tests, replace it with a new one. Ensure that the replacement part is compatible with your vehicle

  19. 19. Clear the Codes

    After making repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  20. 20. Monitor for Recurrence

    After the test drive, monitor the vehicle for any reoccurrence of the P2027 code. If the code returns, further diagnosis may be necessary

  21. 21. Consult Repair Manual

    If you are still having issues, consult the vehicle's repair manual for specific diagnostic procedures and specifications related to the EVAP system and the fuel vapor temperature sensor. By following these steps, you should be able to diagnose and potentially resolve the issue associated with the P2027 code. If you are not comfortable performing these steps, it may be best to consult a professional mechanic