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P0359 Ignition Coil I Primary/Secondary Circuit Malfunction

The OBD2 code P0359 indicates a malfunction in the ignition coil I primary or secondary circuit, which can affect the ignition system's performance and lead to engine misfires or starting issues

Definition

The OBD2 code P0359 indicates a malfunction in the ignition coil I primary or secondary circuit, which can affect the ignition system's performance and lead to engine misfires or starting issues

Common causes

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

Common misdiagnoses

  • Faulty ignition coil
  • Bad spark plugs
  • Ignition control module failure
  • Wiring issues or shorts
  • Engine control unit (ECU) malfunction
  • Fuel injector problems
  • Vacuum leaks
  • Crankshaft or camshaft position sensor failure

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Ignition Coil

    Visual Inspection: Check the ignition coil for any visible signs of damage, such as cracks, corrosion, or burnt areas

  3. 3. Connector Check

    Ensure that the electrical connector to the ignition coil is secure and free of corrosion or damage

  4. 4. Test the Ignition Coil

    Resistance Test: Use a multimeter to measure the resistance of the ignition coil's primary and secondary windings. Compare the readings to the specifications in the vehicle's service manual

  5. 5. Swap Test

    If applicable, swap the ignition coil with another cylinder (that is known to be functioning properly) to see if the code follows the coil

  6. 6. Inspect Wiring and Connectors

    Check the wiring harness and connectors leading to the ignition coil for any signs of wear, fraying, or short circuits

  7. 7. Look for any loose connections or damaged wires that could cause intermittent issues

  8. 8. Check the Power and Ground Supply

    Verify that the ignition coil is receiving the correct voltage and ground. Use a multimeter to check for power at the connector while the ignition is on

  9. 9. Ensure that the ground connection is solid and free of corrosion

  10. 10. Examine the Engine Control Module (ECM)

    If all other components check out, the issue may lie with the ECM. Check for any software updates or known issues with the ECM related to ignition coil control

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

  12. 12. Inspect Related Components

    Check other components related to the ignition system, such as spark plugs, ignition wires, and the crankshaft position sensor, as they can also affect ignition performance

  13. 13. Clear Codes and Test Drive

    After performing 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 reappears

  14. 14. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P0359 code