WOMS
P code powertrain Medium severity

P067D Cylinder 5 Glow Plug Control Circuit High

The OBD2 code P067D indicates that there is a high voltage or an open circuit in the glow plug control circuit for cylinder 5, which may affect the glow plug's ability to heat properly for cold starting

Definition

The OBD2 code P067D indicates that there is a high voltage or an open circuit in the glow plug control circuit for cylinder 5, which may affect the glow plug's ability to heat properly for cold starting

Common causes

  • Faulty glow plug
  • Open or shorted wiring in the glow plug circuit
  • Bad glow plug control module
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Corroded or damaged connectors
  • High resistance in the glow plug circuit

Common misdiagnoses

  • Faulty glow plug
  • Bad glow plug relay
  • Wiring issues or shorts in the circuit
  • Engine control module (ECM) malfunction
  • Faulty fuel injectors
  • Low battery voltage
  • Incorrectly installed or damaged glow plug harness
  • Other cylinder misfire codes
  • Injector timing issues
  • Compression problems in the cylinder

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. Inspect the Glow Plug

    Visual Inspection: Check the glow plug for physical damage or corrosion. If the glow plug is damaged, it may need to be replaced

  3. 3. Resistance Test

    Use a multimeter to measure the resistance of the glow plug. A typical glow plug should have a resistance of a few ohms. If it reads infinite resistance, it is likely faulty

  4. 4. Check the Glow Plug Control Module

    Inspect the glow plug control module for any signs of damage or corrosion. Ensure that all connections are secure and free of dirt or moisture

  5. 5. Test the module according to the manufacturer’s specifications to ensure it is functioning correctly

  6. 6. Inspect Wiring and Connectors

    Check the wiring and connectors leading to the glow plug and the control module. Look for frayed wires, loose connections, or signs of short circuits

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

  8. 8. Test the Glow Plug Relay

    If the vehicle is equipped with a glow plug relay, test it to ensure it is functioning properly. A faulty relay can cause high resistance in the circuit

  9. 9. Replace the relay if it is found to be defective

  10. 10. Check for Short Circuits

    Inspect the circuit for any short circuits that may be causing the high reading. This can include checking for pinched wires or connections that may be touching the ground

  11. 11. Verify Power and Ground

    Use a multimeter to check for proper voltage at the glow plug and control module. Ensure that the glow plug is receiving the correct voltage when activated

  12. 12. Check the ground connections to ensure they are secure and free of corrosion

  13. 13. Perform a System Reset

    After addressing any issues, 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 Manufacturer Specifications

    Refer to the vehicle’s service manual for specific testing procedures and specifications related to the glow plug system

  15. 15. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary 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 P067D code