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P0367 Ignition Coil Q Primary/Secondary Circuit Malfunction

The OBD2 code P0367 indicates a malfunction in the primary or secondary circuit of the ignition coil Q, which can lead to issues with engine performance, misfires, or starting problems

Definition

The OBD2 code P0367 indicates a malfunction in the primary or secondary circuit of the ignition coil Q, which can lead to issues with engine performance, misfires, or starting problems

Common causes

  • Faulty ignition coil
  • Damaged wiring or connectors
  • Short circuit in the ignition coil circuit
  • Open circuit in the ignition coil circuit
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Corroded connectors
  • Faulty spark plugs
  • Incorrectly installed ignition coil

Common misdiagnoses

  • Faulty ignition coil
  • Bad spark plugs
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Fuel delivery problems
  • Timing issues
  • Vacuum leaks
  • Faulty crankshaft or camshaft position sensors

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 Ignition Coil

  3. 3. Visually inspect the ignition coil Q for any signs of damage, such as cracks, corrosion, or burnt areas

  4. 4. Ensure that the electrical connector is securely attached and free of corrosion or dirt

  5. 5. Test the Ignition Coil

  6. 6. Use a multimeter to test the resistance of the ignition coil. Compare the readings to the specifications provided in the vehicle's service manual

  7. 7. If the resistance is out of spec, the ignition coil may need to be replaced

  8. 8. Check Wiring and Connectors

  9. 9. Inspect the wiring harness and connectors leading to the ignition coil for any signs of damage, fraying, or short circuits

  10. 10. Repair or replace any damaged wiring or connectors

  11. 11. Test the Power and Ground

  12. 12. Use a multimeter to check for proper voltage at the ignition coil connector while the engine is running. You should see battery voltage

  13. 13. Check for a good ground connection at the ignition coil. A poor ground can cause circuit malfunctions

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

  15. 15. If the ignition coil and wiring are in good condition, the issue may lie with the ECM. Check for any software updates or known issues with the ECM for your vehicle model

  16. 16. In some cases, reprogramming or replacing the ECM may be necessary

  17. 17. Check for Vacuum Leaks

  18. 18. Vacuum leaks can cause misfires and may trigger ignition coil codes. Inspect the intake manifold and vacuum hoses for leaks

  19. 19. Perform a Visual Inspection of Related Components

  20. 20. Check spark plugs for wear or damage, as faulty spark plugs can affect ignition coil performance

  21. 21. Inspect other ignition coils if applicable, as a failure in one coil can sometimes affect others

  22. 22. Clear the Codes and Test Drive

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

  24. 24. Consult a Professional

  25. 25. If the issue persists after performing these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P0367 code