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P0357 Ignition Coil G Primary/Secondary Circuit Malfunction

The OBD2 code P0357 indicates a malfunction in the primary or secondary circuit of Ignition Coil G, which can lead to issues with engine performance, misfires, or starting problems

Definition

The OBD2 code P0357 indicates a malfunction in the primary or secondary circuit of Ignition Coil G, 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 or ignition leads

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 trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Visual Inspection

    Inspect the ignition coil G and its wiring for any visible damage, such as frayed wires, corrosion, or loose connections

  3. 3. Check the connectors for signs of wear or damage

  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 Power and Ground Supply

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

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

  8. 8. Inspect the ECM

    Check for any signs of damage or corrosion on the ECM connectors

  9. 9. If other components are functioning correctly, the ECM may be at fault. However, this is less common

  10. 10. Test the Wiring

    Use a multimeter to check the continuity of the wiring between the ignition coil and the ECM. Look for any breaks or shorts in the wiring

  11. 11. If the wiring is damaged, repair or replace it as necessary

  12. 12. Swap Ignition Coils (if applicable)

    If the vehicle has multiple ignition coils, consider swapping the ignition coil G with another coil to see if the code follows the coil. This can help determine if the coil itself is faulty

  13. 13. Clear the Codes and Test Drive

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

  14. 14. Take the vehicle for a test drive to see if the code reappears

  15. 15. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic for further diagnosis.Additional Considerations - Ensure that you are using the correct ignition coil for your specific vehicle make and model. - If the vehicle has been modified or has aftermarket parts, ensure compatibility with the ignition system. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0357 code