WOMS
P code powertrain Medium severity

P069D Cylinder 10 Glow Plug Control Circuit High

The OBD2 code P069D indicates a high voltage condition in the glow plug control circuit for cylinder 10, suggesting a potential issue with the glow plug or its control module

Definition

The OBD2 code P069D indicates a high voltage condition in the glow plug control circuit for cylinder 10, suggesting a potential issue with the glow plug or its control module

Common causes

  • Faulty glow plug
  • Open or shorted wiring in the glow plug circuit
  • Faulty glow plug control module
  • Poor electrical connections
  • Blown fuse
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty glow plug
  • Bad glow plug relay
  • Wiring issues or shorts in the circuit
  • Faulty engine control module (ECM)
  • Incorrectly installed or damaged glow plug harness
  • Fuel system issues
  • Injector problems
  • Compression issues in the cylinder
  • Faulty temperature sensor
  • Battery or charging system problems

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 any signs of damage, corrosion, or wear. Ensure that it is properly seated in the cylinder head

  3. 3. Resistance Test

    Use a multimeter to measure the resistance of the glow plug. A typical glow plug should have a resistance of around 0.5 to 2 ohms. If the resistance is too high or infinite, the glow plug may be 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 any signs of short circuits

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

  8. 8. Test the Power Supply

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

  9. 9. If there is no power, trace the circuit back to the fuse box and check for blown fuses or faulty relays

  10. 10. Check for Ground Issues

    Ensure that the glow plug and control module have a good ground connection. A poor ground can lead to high resistance and trigger the P069D code

  11. 11. Inspect Engine Control Module (ECM)

    If all other components check out, there may be an issue with the ECM. Ensure that the ECM is functioning correctly and is not sending incorrect signals to the glow plug control circuit

  12. 12. 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

  13. 13. Seek Professional Help

    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 P069D code