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P035C Ignition Coil 'C' Primary/Secondary Circuit Malfunction

The OBD2 code P035C indicates a malfunction in the primary or secondary circuit of ignition coil 'C', which can lead to issues with engine performance, such as misfires or rough idling

Definition

The OBD2 code P035C indicates a malfunction in the primary or secondary circuit of ignition coil 'C', which can lead to issues with engine performance, such as misfires or rough idling

Common causes

  • Faulty ignition coil 'C'
  • 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 wire
  • Issues with the ignition system power supply

Common misdiagnoses

  • Faulty ignition coil
  • Bad spark plugs
  • Ignition control module issues
  • Wiring or connector problems
  • Engine control unit (ECU) malfunction
  • Fuel injector issues
  • Vacuum leaks
  • Timing belt or chain problems
  • Crankshaft or camshaft position sensor failure
  • Battery or charging system issues

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. Visual Inspection

    Wiring and Connectors: Inspect the wiring and connectors associated with ignition coil 'C' for any signs of damage, corrosion, or loose connections

  3. 3. Ignition Coil

    Check the ignition coil itself for any physical damage or signs of wear

  4. 4. Test the Ignition Coil

    Resistance Test: Use a multimeter to measure the resistance of the ignition coil. Compare the readings to the specifications provided in the vehicle’s service manual

  5. 5. Swap Test

    If possible, swap the ignition coil 'C' with another coil (e.g., coil 'A' or 'B') to see if the code follows the coil. If it does, the coil is likely faulty

  6. 6. Check Power and Ground

    Power Supply: Verify that the ignition coil is receiving the correct voltage. Use a multimeter to check for power at the coil connector

  7. 7. Ground Connection

    Ensure that the ground connection for the ignition coil is solid and free of corrosion

  8. 8. Inspect the PCM (Powertrain Control Module)

    Check for any signs of damage or corrosion in the PCM connectors. A malfunctioning PCM can sometimes cause ignition coil issues

  9. 9. Check for Short Circuits

    Inspect the wiring harness for any signs of short circuits or grounding issues that could affect the ignition coil circuit

  10. 10. Test the Ignition Control Circuit

    If the ignition coil and wiring appear to be in good condition, test the ignition control circuit. This may involve checking the signal from the PCM to the ignition coil

  11. 11. Check for Vacuum Leaks

    While not directly related to the ignition coil, vacuum leaks can cause misfires and other issues that may trigger ignition-related codes

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

  13. 13. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment.Additional Notes: - Always refer to the vehicle’s service manual for specific testing procedures and specifications. - Safety first: Ensure the vehicle is turned off and properly secured before working on electrical components. By following these troubleshooting steps, you should be able to identify the cause of the P035C code and take appropriate action to resolve the issue