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P code powertrain Medium severity

P0517 Intake Air Temperature Sensor 2 High Input

The OBD2 code P0517 indicates that the Intake Air Temperature Sensor 2 is reporting a high voltage input, which may suggest a malfunction in the sensor or its circuit

Definition

The OBD2 code P0517 indicates that the Intake Air Temperature Sensor 2 is reporting a high voltage input, which may suggest a malfunction in the sensor or its circuit

Common causes

  • Faulty Intake Air Temperature Sensor 2
  • Open or shorted wiring in the sensor circuit
  • Poor electrical connections or corroded connectors
  • Faulty Engine Control Module (ECM)
  • Intake air duct leaks
  • Incorrect sensor calibration or installation

Common misdiagnoses

  • Faulty Intake Air Temperature Sensor
  • Wiring issues or short circuits
  • Engine Control Module (ECM) malfunction
  • Air filter blockage
  • Mass Air Flow (MAF) sensor issues
  • Vacuum leaks
  • Coolant temperature sensor problems
  • Throttle position sensor faults

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 additional context for the problem

  2. 2. Inspect the IAT Sensor and Wiring

    Visual Inspection: Check the IAT sensor for any physical damage, corrosion, or loose connections

  3. 3. Wiring

    Inspect the wiring harness for frays, breaks, or shorts. Ensure that the connectors are clean and securely attached

  4. 4. Test the IAT Sensor

    Resistance Check: Use a multimeter to measure the resistance of the IAT sensor. Compare the readings to the manufacturer's specifications. A faulty sensor may show resistance values outside the normal range

  5. 5. Temperature Check

    You can also test the sensor by measuring the voltage output while heating it (e.g., using a heat gun) and observing if the voltage changes appropriately with temperature

  6. 6. Check the ECM

    Ensure that the ECM is functioning correctly. If the ECM is faulty, it may misinterpret the signals from the IAT sensor

  7. 7. Check for any software updates or recalls related to the ECM

  8. 8. Inspect the Air Intake System

    Check for any obstructions or leaks in the air intake system that could affect the air temperature readings

  9. 9. Ensure that the air filter is clean and not restricting airflow

  10. 10. Clear Codes and Test Drive

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

  11. 11. Take the vehicle for a test drive to see if the code reappears

  12. 12. Consult Repair Manual

    If the issue persists, consult the vehicle’s repair manual for specific diagnostic procedures related to the IAT sensor and the P0517 code

  13. 13. Professional Diagnosis

    If you are unable to resolve the issue, consider seeking help from a professional mechanic who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P0517 code