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P code powertrain Medium severity

P1445 Purge Flow Sensor Circuit High Input

The OBD2 code P1445 indicates that the purge flow sensor circuit is receiving a high voltage input, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P1445 indicates that the purge flow sensor circuit is receiving a high voltage input, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty purge flow sensor
  • Wiring issues (shorts or open circuits)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Vacuum leaks in the EVAP system
  • Blocked or restricted EVAP lines
  • Faulty fuel tank pressure sensor

Common misdiagnoses

  • Faulty purge valve
  • Faulty fuel tank pressure sensor
  • Vacuum leaks
  • Faulty engine control module (ECM)
  • Wiring issues or shorts in the circuit
  • Faulty charcoal canister
  • Incorrectly installed or damaged hoses

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect the Purge Flow Sensor

    Locate the purge flow sensor and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the electrical connector is secure and free of dirt or moisture

  4. 4. Test the Purge Flow Sensor

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

  5. 5. If the sensor is out of specification, it may need to be replaced

  6. 6. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the purge flow sensor for any signs of wear, fraying, or short circuits

  7. 7. Look for any signs of chafing or damage that could cause a short to ground or an open circuit

  8. 8. Test the Circuit

    With the ignition on (engine off), use a multimeter to check the voltage at the purge flow sensor connector. Compare the readings to the specifications in the service manual

  9. 9. If the voltage is too high, there may be a short circuit somewhere in the wiring

  10. 10. Inspect the EVAP System

    Check for any leaks or blockages in the EVAP system, including hoses, valves, and the charcoal canister

  11. 11. Ensure that the gas cap is properly sealed and in good condition, as a faulty gas cap can trigger EVAP-related codes

  12. 12. Check the Engine Control Module (ECM)

    If all other components check out, there may be an issue with the ECM itself. This is less common but can happen

  13. 13. Ensure that the ECM is receiving the correct signals and is functioning properly

  14. 14. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  15. 15. Take the vehicle for a test drive to see if the code returns. Monitor the vehicle’s performance and emissions

  16. 16. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with EVAP systems and OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1445 code. Always refer to the specific service manual for your vehicle for detailed information and specifications