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P035E Ignition Coil 'E' Primary/Secondary Circuit Malfunction

The OBD2 code P035E indicates a malfunction in the primary or secondary circuit of ignition coil 'E', which can lead to issues with engine performance, such as misfires or rough idling

Definition

The OBD2 code P035E indicates a malfunction in the primary or secondary circuit of ignition coil 'E', which can lead to issues with engine performance, such as misfires or rough idling

Common causes

  • Faulty ignition coil 'E'
  • 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 plugs or ignition components
  • Electrical interference or noise in the circuit

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 multiple issues

  2. 2. Visual Inspection

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

  6. 6. Check the Power and Ground 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

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

  8. 8. Inspect the Wiring Harness

    Check the wiring harness for any signs of damage or short circuits. Look for pinched or broken wires that could affect the coil's operation

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

    If the ignition coil and wiring are in good condition, the issue may lie with the ECM. Check for any software updates or known issues with the ECM for your vehicle model

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

  11. 11. Swap Ignition Coils

    If your vehicle has multiple ignition coils, consider swapping the suspected faulty coil with a known good one to see if the code follows the coil. This can help confirm whether the coil is the issue

  12. 12. Check for Vacuum Leaks

    Inspect for any vacuum leaks that could affect engine performance and lead to ignition issues

  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 returns

  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 should be able to identify and resolve the issue related to the P035E code