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P code powertrain Medium severity

P1424 EGI Glow Plug Primary Failure

The OBD2 code P1424 EGI Glow Plug Primary Failure indicates a malfunction in the primary glow plug circuit, which affects the engine's ability to start efficiently in cold conditions

Definition

The OBD2 code P1424 EGI Glow Plug Primary Failure indicates a malfunction in the primary glow plug circuit, which affects the engine's ability to start efficiently in cold conditions

Common causes

  • Faulty glow plug
  • Poor electrical connections
  • Failed glow plug relay
  • Damaged wiring or harness
  • Faulty engine control module (ECM)
  • Corroded connectors
  • Short circuit in the glow plug circuit
  • Incorrect glow plug type or specification

Common misdiagnoses

  • Faulty glow plugs
  • Bad glow plug relay
  • Electrical wiring issues
  • Engine control module (ECM) failure
  • Fuel system problems
  • Injector issues
  • Air intake problems
  • Exhaust system blockages

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 help identify if there are related issues that need to be addressed

  2. 2. Inspect Glow Plugs

  3. 3. Visually inspect the glow plugs for any signs of damage, corrosion, or wear

  4. 4. Use a multimeter to test the resistance of each glow plug. A typical reading should be between 0.5 to 2 ohms. If any glow plug shows an open circuit (infinite resistance) or significantly higher resistance, it may need to be replaced

  5. 5. Check Glow Plug Relay

  6. 6. Inspect the glow plug relay for proper operation. You can test the relay by applying power directly to it and checking if it activates the glow plugs

  7. 7. Ensure that the relay is receiving the correct voltage from the engine control module (ECM)

  8. 8. Inspect Wiring and Connectors

  9. 9. Check the wiring harness and connectors leading to the glow plugs and relay for any signs of damage, corrosion, or loose connections

  10. 10. Repair or replace any damaged wiring or connectors

  11. 11. Test the Glow Plug Control Module (if applicable)

  12. 12. Some vehicles have a glow plug control module that regulates the operation of the glow plugs. Test this module for proper function according to the manufacturer's specifications

  13. 13. Check Battery Voltage

  14. 14. Ensure that the vehicle's battery is fully charged and in good condition. Low voltage can affect the operation of the glow plugs

  15. 15. Inspect Engine Coolant Temperature Sensor

  16. 16. The engine coolant temperature sensor provides input to the ECM regarding the engine's temperature. If this sensor is faulty, it may cause the glow plugs to operate incorrectly

  17. 17. Clear Codes and Test Drive

  18. 18. After performing the necessary repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  19. 19. Consult Repair Manual

  20. 20. If the issue persists, consult the vehicle's repair manual for specific diagnostic procedures and specifications related to the glow plug system

  21. 21. Seek Professional Help

  22. 22. If you are unable to resolve the issue after following these steps, it may be best to consult a professional mechanic or technician who has experience with diesel engines and glow plug systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1424 code