WOMS
P code powertrain Medium severity

P1349 Fuel Level Sensor B Circuit High

The OBD2 code P1349 indicates that the fuel level sensor B circuit is experiencing a high voltage condition, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P1349 indicates that the fuel level sensor B circuit is experiencing a high voltage condition, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty fuel level sensor
  • Damaged wiring or connectors
  • Short circuit in the fuel level sensor circuit
  • Open circuit in the fuel level sensor circuit
  • Faulty engine control module (ECM)
  • Corrosion in connectors or terminals
  • Poor ground connection
  • Incorrectly installed or malfunctioning fuel pump assembly

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
  • Incorrect fuel level readings due to fuel contamination
  • Grounding issues in the electrical system

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 for the issue

  2. 2. Inspect the Fuel Level Sensor

    Locate the fuel level sensor (usually found in the fuel tank)

  3. 3. Check for any visible damage to the sensor or its wiring

  4. 4. Ensure that the connector is secure and free of corrosion or dirt

  5. 5. Test the Fuel Level Sensor

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

  6. 6. If the resistance is outside the specified range, the sensor may be faulty and need replacement

  7. 7. Check Wiring and Connectors

    Inspect the wiring harness leading to the fuel level sensor for any signs of wear, fraying, or damage

  8. 8. Check the connectors for corrosion, bent pins, or loose connections

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

  10. 10. Inspect the Fuel Gauge

    If the fuel level sensor appears to be functioning correctly, the issue may lie with the fuel gauge itself

  11. 11. Test the fuel gauge for proper operation. This may involve checking the gauge's voltage and ground connections

  12. 12. Check for Ground Issues

    Ensure that the fuel level sensor has a good ground connection. A poor ground can cause erratic readings

  13. 13. Use a multimeter to check for continuity between the sensor ground and the vehicle chassis

  14. 14. Look for Short Circuits

    Inspect the circuit for any short circuits that may cause the sensor to read high

  15. 15. Use a multimeter to check for continuity between the sensor circuit and power sources

  16. 16. Clear the Codes and Test Drive

    After performing repairs, clear the trouble codes using the OBD-II scanner

  17. 17. Take the vehicle for a test drive to see if the code returns

  18. 18. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician for further diagnosis.Additional Notes: - Always refer to the vehicle’s service manual for specific testing procedures and specifications. - Safety precautions should be taken when working with fuel systems, including disconnecting the battery and relieving fuel system pressure. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1349 code