WOMS
P code powertrain High severity

P0329 Knock Sensor 2 Circuit High Input (Bank 2)

The OBD2 code P0329 indicates that the engine control module has detected a high voltage signal from the knock sensor 2 circuit on bank 2, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P0329 indicates that the engine control module has detected a high voltage signal from the knock sensor 2 circuit on bank 2, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty knock sensor
  • Damaged wiring or connectors
  • Short circuit in the knock sensor circuit
  • Open circuit in the knock sensor circuit
  • Engine control module (ECM) issues
  • Poor ground connection
  • Engine mechanical issues (e.g., excessive engine noise)

Common misdiagnoses

  • Faulty knock sensor
  • Wiring issues or shorts in the knock sensor circuit
  • Engine control module (ECM) failure
  • Incorrect fuel octane rating
  • Vacuum leaks
  • Ignition timing issues
  • Fuel delivery problems
  • Engine mechanical issues (e.g., worn components)
  • Other sensor failures (e.g., MAF, MAP)
  • Exhaust system issues (e.g., leaks)

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 Knock Sensor

    Locate the knock sensor for Bank 2 and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly mounted and that the mounting surface is clean

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the knock sensor for any signs of wear, fraying, or damage

  5. 5. Look for any signs of short circuits or open circuits in the wiring

  6. 6. Test the Knock Sensor

    Use a multimeter to test the resistance of the knock sensor. Refer to the vehicle’s service manual for the specific resistance values for the knock sensor

  7. 7. If the resistance is outside the specified range, the sensor may need to be replaced

  8. 8. Check the Engine Ground

    Ensure that the engine ground is secure and free of corrosion. A poor ground connection can lead to erratic sensor readings

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

    Check for any signs of damage or corrosion in the ECM connectors

  10. 10. If other components are also malfunctioning, the ECM may be at fault

  11. 11. Clear the Codes and Test Drive

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

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

  13. 13. Check for Vacuum Leaks

    Inspect for any vacuum leaks in the intake system, as these can affect engine performance and may lead to false knock sensor readings

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the knock sensor or engine performance issues for your specific vehicle make and model

  15. 15. Professional Diagnosis

    If the issue persists after performing the above steps, 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 P0329 code