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P035D Ignition Coil 'D' Primary/Secondary Circuit Malfunction

The OBD2 code P035D indicates a malfunction in the primary or secondary circuit of ignition coil 'D', which can affect the ignition system's performance and lead to engine misfires or poor running conditions

Definition

The OBD2 code P035D indicates a malfunction in the primary or secondary circuit of ignition coil 'D', which can affect the ignition system's performance and lead to engine misfires or poor running conditions

Common causes

  • Faulty ignition coil 'D'
  • Damaged wiring or connectors in the ignition circuit
  • Short circuit or open circuit in the ignition coil circuit
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Corroded or damaged terminals
  • Faulty spark plug or spark plug gap issues
  • Issues with the ignition coil driver circuit in the ECM

Common misdiagnoses

  • Faulty ignition coil
  • Bad spark plugs
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Fuel delivery problems
  • Vacuum leaks
  • Faulty crankshaft or camshaft position sensors
  • Injector issues
  • Compression problems
  • Ignition module 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 other issues affecting the ignition system

  2. 2. Inspect the Ignition Coil

    Visually inspect the ignition coil 'D' for any signs of damage, such as cracks, corrosion, or burnt areas

  3. 3. Ensure that the coil is properly seated and connected

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the ignition coil for any signs of wear, fraying, or corrosion

  5. 5. Ensure that all connections are secure and free of dirt or moisture

  6. 6. Test the Ignition Coil

    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 coil is out of specification, it may need to be replaced

  8. 8. Check the Power Supply

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

  9. 9. If there is no power, trace the wiring back to the ignition control module or PCM (Powertrain Control Module) to identify any issues

  10. 10. Test the Ignition Control Module (ICM) or PCM

    If the ignition coil and wiring are in good condition, the issue may lie with the ignition control module or the PCM

  11. 11. Test the ICM or PCM according to the manufacturer's specifications. This may require specialized equipment or professional assistance

  12. 12. Check for Ground Issues

    Ensure that the ignition coil has a good ground connection. A poor ground can cause circuit malfunctions

  13. 13. Use a multimeter to check for continuity between the coil ground and the vehicle chassis

  14. 14. Inspect Related Components

    Check other components in the ignition system, such as spark plugs and spark plug wires, for wear or damage. Faulty spark plugs can sometimes cause ignition coil issues

  15. 15. If the vehicle has a distributor, inspect it for any signs of wear or damage

  16. 16. Clear Codes and Test Drive

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

  17. 17. Take the vehicle for a test drive to see if the code returns. Monitor the vehicle's performance for any signs of misfire or rough running

  18. 18. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic for further diagnosis. They may have access to advanced diagnostic tools and experience with specific vehicle models. By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P035D code