WOMS
P code powertrain Medium severity

P067F Glow Plug Control Module Performance

The OBD2 code P067F indicates a problem with the performance of the glow plug control module, which is responsible for managing the operation of the glow plugs in a diesel engine

Definition

The OBD2 code P067F indicates a problem with the performance of the glow plug control module, which is responsible for managing the operation of the glow plugs in a diesel engine

Common causes

  • Faulty glow plug control module
  • Defective glow plugs
  • Wiring issues or poor connections
  • Faulty engine control module (ECM)
  • Corroded or damaged connectors
  • Short circuits in the glow plug circuit
  • Open circuits in the glow plug circuit
  • Faulty relays or fuses related to the glow plug system
  • Software issues in the ECM
  • Excessive resistance in the glow plug circuit

Common misdiagnoses

  • Faulty glow plugs
  • Bad glow plug relay
  • Wiring issues or shorts in the glow plug circuit
  • Faulty engine control module (ECM)
  • Incorrectly diagnosed fuel system issues
  • Misinterpretation of other related codes
  • Battery or charging system problems
  • Faulty temperature sensors

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 Glow Plugs

    Visual Inspection: Check the glow plugs for physical damage, corrosion, or carbon buildup

  3. 3. Resistance Test

    Measure the resistance of each glow plug using a multimeter. Typically, a good glow plug will have a resistance of around 0.5 to 5 ohms. If any glow plug is out of this range, it may need to be replaced

  4. 4. Check the Glow Plug Control Module

    Connections: Inspect the wiring and connectors to the glow plug control module for damage, corrosion, or loose connections

  5. 5. Power and Ground

    Verify that the control module is receiving the correct voltage and has a good ground connection

  6. 6. Test the Glow Plug Relay

    If your vehicle uses a relay to control the glow plugs, test the relay to ensure it is functioning properly. You can do this by swapping it with a known good relay or testing it with a multimeter

  7. 7. Inspect the Wiring Harness

    Check the wiring harness for any signs of wear, fraying, or damage that could affect the signal to the glow plug control module

  8. 8. Check for Short Circuits

    Look for any short circuits in the wiring that could cause the glow plug control module to malfunction

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

    In some cases, the issue may lie with the ECM itself. Check for software updates or reprogramming if necessary

  10. 10. Clear Codes and Test Drive

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

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the glow plug control module or the specific vehicle model, as manufacturers may have issued fixes for known issues

  12. 12. Seek Professional Help

    If the problem persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with diesel engines and OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P067F code