WOMS
P code powertrain Medium severity

P067B Glow Plug Module Performance Problem (Bank 1)

The OBD2 code P067B indicates a performance issue with the glow plug module on Bank 1, which may affect the operation of the glow plugs used for starting a diesel engine

Definition

The OBD2 code P067B indicates a performance issue with the glow plug module on Bank 1, which may affect the operation of the glow plugs used for starting a diesel engine

Common causes

  • Faulty glow plug module
  • Defective glow plugs
  • Wiring issues or damaged connectors
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Short circuits in the glow plug circuit
  • Open circuits in the glow plug circuit
  • Corroded terminals or connectors
  • Malfunctioning temperature sensors
  • Software issues in the ECM

Common misdiagnoses

  • Faulty glow plugs
  • Bad glow plug relay
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Fuel system problems
  • Injector issues
  • Air intake problems
  • Exhaust system restrictions

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 Plug Module

    Visual Inspection: Check the glow plug module for any visible damage, corrosion, or loose connections

  3. 3. Connector Check

    Ensure that the electrical connectors to the glow plug module are secure and free of corrosion

  4. 4. Test the Glow Plugs

    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 shows an open circuit (infinite resistance) or significantly higher resistance, it may need to be replaced

  5. 5. Voltage Test

    With the ignition on, check for voltage at the glow plugs. You should see battery voltage when the glow plugs are activated

  6. 6. Check the Glow Plug Relay

    Inspect the glow plug relay for proper operation. You can test the relay by applying power to it and checking if it activates. If the relay is faulty, it may not supply power to the glow plugs

  7. 7. Inspect Wiring and Connectors

    Check the wiring harness for any signs of damage, fraying, or short circuits. Pay special attention to the wires leading to the glow plugs and the module

  8. 8. Ensure that all ground connections are clean and secure

  9. 9. Test the Glow Plug Control Module

    If the glow plug module is suspected to be faulty, it can be tested or replaced. Some vehicles may require specialized equipment to test the module's functionality

  10. 10. Check for Engine Control Module (ECM) Issues

    In some cases, the ECM may be at fault. Check for any software updates or reprogramming that may be needed. If the ECM is malfunctioning, it may not properly control the glow plug module

  11. 11. Inspect for Other Related Issues

    Look for any issues that could affect the glow plug operation, such as low battery voltage, poor connections, or other engine performance problems

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  13. 13. Consult Repair Manual or Professional Help

    If the issue persists after following these steps, consult the vehicle’s repair manual for specific diagnostic procedures or consider seeking help from a professional mechanic. By following these troubleshooting steps, you should be able to identify the cause of the P067B code and take appropriate action to resolve the issue