WOMS
P code powertrain Medium severity

P1396 Glow Plug Monitor Fault (Bank #2)

The OBD2 code P1396 indicates a fault in the glow plug monitoring system for bank #2, suggesting that there is an issue with the glow plugs or their control circuit in that bank

Definition

The OBD2 code P1396 indicates a fault in the glow plug monitoring system for bank #2, suggesting that there is an issue with the glow plugs or their control circuit in that bank

Common causes

  • Faulty glow plug (Bank #2)
  • Bad glow plug relay
  • Open or shorted wiring in the glow plug circuit
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Failed glow plug control module
  • Corroded or damaged connectors
  • Malfunctioning temperature sensor

Common misdiagnoses

  • Faulty glow plugs
  • Bad glow plug relay
  • Wiring issues or shorts in the glow plug circuit
  • Faulty engine control module (ECM)
  • Incorrectly calibrated or faulty sensors (e.g., temperature sensors)
  • Fuel system issues
  • Injector problems
  • Exhaust gas recirculation (EGR) system faults
  • Air intake system issues
  • 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 Glow Plugs

    Visual Inspection: Check the glow plugs on Bank #2 for any visible damage, corrosion, or loose connections

  3. 3. Resistance Test

    Use a multimeter to measure the resistance of each glow plug. A typical glow plug should 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

  4. 4. Check Glow Plug Relay

    Inspect the glow plug relay for proper operation. A faulty relay can prevent the glow plugs from receiving power. Test the relay by applying power directly to it or using a multimeter to check for continuity

  5. 5. Examine Wiring and Connectors

    Inspect the wiring harness and connectors leading to the glow plugs and relay for any signs of damage, fraying, or corrosion. Repair or replace any damaged wiring or connectors

  6. 6. Test Power Supply

    Check for proper voltage at the glow plugs when the ignition is turned on. You should see battery voltage (typically around 12V) at the glow plugs when they are activated. If there is no voltage, trace back to the relay and fuse

  7. 7. Check Engine Control Module (ECM)

    If all components appear to be functioning correctly, the issue may lie with the ECM. Ensure that the ECM is receiving the correct signals and is functioning properly. In some cases, a software update or reprogramming may be necessary

  8. 8. Inspect Fuses

    Check the fuses related to the glow plug system. A blown fuse can interrupt the power supply to the glow plugs

  9. 9. 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 reappears

  10. 10. Seek Professional Help

    If the issue persists after performing 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 P1396 code