WOMS
P code powertrain Medium severity

P1395 Glow Plug Monitor Fault (Bank #1)

The OBD2 code P1395 indicates a malfunction in the glow plug monitoring system for bank #1, which may affect the performance of the diesel engine's glow plugs

Definition

The OBD2 code P1395 indicates a malfunction in the glow plug monitoring system for bank #1, which may affect the performance of the diesel engine's glow plugs

Common causes

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

Common misdiagnoses

  • Faulty glow plugs
  • Glow plug relay issues
  • Wiring or connector problems
  • Engine control module (ECM) faults
  • Fuel injection issues
  • Injector problems
  • Air intake system faults
  • Exhaust gas recirculation (EGR) system issues
  • Cylinder compression problems
  • Temperature sensor malfunctions

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 for physical damage, corrosion, or carbon buildup

  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 2 ohms. If the resistance is significantly higher or infinite, the glow plug may be faulty

  4. 4. Test Glow Plug Relay

    The glow plug relay controls the power to the glow plugs. Test the relay for proper operation. You can do this by checking for continuity when the relay is activated or by swapping it with a known good relay

  5. 5. Check Wiring and Connectors

    Inspect the wiring and connectors leading to the glow plugs and the relay. Look for frayed wires, loose connections, or corrosion that could affect the electrical flow

  6. 6. Examine the Glow Plug Control Module

    If your vehicle is equipped with a glow plug control module, check its operation. This module regulates the timing and duration of the glow plug operation. Ensure it is receiving the correct signals and functioning properly

  7. 7. Check Engine Coolant Temperature Sensor

    The engine coolant temperature (ECT) sensor can affect the operation of the glow plugs. If the sensor is faulty, it may not provide the correct temperature readings, leading to improper glow plug operation

  8. 8. Inspect the Battery and Charging System

    Ensure that the battery is in good condition and fully charged. A weak battery can affect the performance of the glow plugs, especially during cold starts

  9. 9. Clear Codes and Test Drive

    After performing the necessary repairs, 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 you are unable to diagnose or fix the issue, consider seeking help from a qualified mechanic or technician who has experience with diesel engines and glow plug systems. By following these steps, you should be able to identify and resolve the issue related to the P1395 code