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P2308 Ignition Coil "C" Secondary Circuit

The OBD2 code P2308 indicates a malfunction in the secondary circuit of ignition coil "C," which may involve issues such as a short circuit, open circuit, or poor connection affecting the coil's performance

Definition

The OBD2 code P2308 indicates a malfunction in the secondary circuit of ignition coil "C," which may involve issues such as a short circuit, open circuit, or poor connection affecting the coil's performance

Common causes

  • Faulty ignition coil "C"
  • Damaged or corroded wiring or connectors in the ignition circuit
  • 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 module failure
  • Wiring issues or shorts
  • Engine control module (ECM) problems
  • Fuel injector issues
  • 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 trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Ignition Coil

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

  3. 3. Ensure that the coil is properly seated in the engine and that the connectors are secure

  4. 4. 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

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

  6. 6. Check the Wiring and Connectors

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

  7. 7. Ensure that there are no loose connections or broken wires

  8. 8. Test the Power and Ground

    Use a multimeter to check for proper voltage at the ignition coil connector. You should see battery voltage when the ignition is on

  9. 9. Check for a good ground connection at the ignition coil. A poor ground can cause the coil to malfunction

  10. 10. Inspect the Spark Plug

    Remove the spark plug associated with ignition coil "C" and inspect it for wear or damage. A fouled or damaged spark plug can affect ignition performance

  11. 11. Replace the spark plug if necessary

  12. 12. Check for Engine Mechanical Issues

    Ensure that there are no mechanical issues affecting the engine, such as low compression or timing problems, which can also lead to ignition issues

  13. 13. Test the Engine Control Module (ECM)

    If all other components check out, the issue may lie with the ECM. Ensure that the ECM is functioning properly and is sending the correct signals to the ignition coil

  14. 14. Clear Codes and Test Drive

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

  15. 15. Take the vehicle for a test drive to see if the code returns

  16. 16. 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 should be able to identify and resolve the issue related to the P2308 code