WOMS
P code powertrain Medium severity

P1350 Fuel Level Sensor B Intermittent/Bypass Line Monitor

The OBD2 code P1350 indicates a problem with the fuel level sensor B, specifically that there is an intermittent issue or a bypass in the line monitor, which may affect the accurate reading of the fuel level

Definition

The OBD2 code P1350 indicates a problem with the fuel level sensor B, specifically that there is an intermittent issue or a bypass in the line monitor, which may affect the accurate reading of the fuel level

Common causes

  • Faulty fuel level sensor
  • Wiring issues (damaged or corroded wires)
  • Poor electrical connections
  • Faulty fuel gauge module
  • Short circuit in the fuel level sensor circuit
  • Open circuit in the fuel level sensor circuit
  • Software issues in the vehicle's ECU
  • Grounding issues in the fuel level sensor circuit

Common misdiagnoses

  • Faulty fuel level sensor
  • Wiring issues or shorts in the fuel level sensor circuit
  • Fuel gauge cluster problems
  • ECM/PCM issues
  • Fuel pump problems
  • Grounding issues
  • Incorrect fuel level readings due to fuel contamination or debris

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 Fuel Level Sensor

    Locate the fuel level sensor (usually found in the fuel tank) and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly connected and that the wiring harness is intact

  4. 4. Test the Fuel Level Sensor

    Use a multimeter to test the resistance of the fuel level sensor. Compare the readings to the specifications provided in the vehicle's service manual

  5. 5. If the readings are outside the specified range, the sensor may need to be replaced

  6. 6. Check the Wiring and Connectors

    Inspect the wiring and connectors leading to the fuel level sensor for any signs of wear, fraying, or corrosion

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

  8. 8. Examine the Fuel Pump Assembly

    Since the fuel level sensor is often part of the fuel pump assembly, check the entire assembly for any issues

  9. 9. Ensure that the fuel pump is functioning correctly, as a malfunctioning pump can affect fuel level readings

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the fuel level sensor and related components are secure and free of corrosion

  11. 11. A poor ground connection can lead to intermittent signals and trigger the P1350 code

  12. 12. Inspect the Fuel Tank

    If applicable, check the fuel tank for any signs of damage or contamination that could affect the sensor's operation

  13. 13. Ensure that the fuel tank is not overfilled, as this can sometimes cause erroneous readings

  14. 14. Clear the Code and Test Drive

    After performing the necessary repairs or inspections, clear the trouble code using the OBD-II scanner

  15. 15. Take the vehicle for a test drive to see if the code reappears. Monitor the fuel gauge to ensure it is functioning correctly

  16. 16. Consult a Professional

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. They may have access to specialized tools and equipment to pinpoint the problem.Conclusion Troubleshooting OBD-II code P1350 involves a systematic approach to inspect and test the fuel level sensor and its associated components. By following these steps, you can identify and resolve the underlying issue, restoring proper functionality to the fuel level monitoring system