WOMS
U code network Medium severity

U1455 Lost Communication with Fuel Level Sensor 'A'

The OBD2 code U1455 indicates that there is a communication failure between the vehicle's control module and the fuel level sensor 'A', which may affect the accurate reading of the fuel level

Definition

The OBD2 code U1455 indicates that there is a communication failure between the vehicle's control module and the fuel level sensor 'A', which may affect the accurate reading of the fuel level

Common causes

  • Faulty fuel level sensor
  • Damaged wiring or connectors
  • Poor ground connection
  • Failed engine control module (ECM)
  • Corroded or loose electrical connections
  • Short circuit in the wiring harness
  • Faulty fuel gauge or instrument cluster
  • Software issues in the ECM

Common misdiagnoses

  • Faulty fuel level sensor
  • Wiring issues or damaged connectors
  • Faulty engine control module (ECM)
  • Fuel gauge cluster malfunction
  • Grounding issues
  • Faulty fuel pump
  • Instrument cluster issues
  • Corroded terminals or connectors

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 other issues present

  2. 2. Inspect the Fuel Level Sensor

    Visual Inspection: Check the fuel level sensor for any visible damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors leading to the fuel level sensor for fraying, breaks, or corrosion

  4. 4. Test the Fuel Level Sensor

    Resistance Test: Use a multimeter to measure the resistance of the fuel level sensor. Compare the readings to the manufacturer’s specifications

  5. 5. Functionality Test

    If possible, test the sensor by applying different fuel levels and observing if the output changes accordingly

  6. 6. Check the Fuel Pump Module

    If the fuel level sensor is part of a fuel pump module, inspect the entire module for faults. Ensure that the module is functioning correctly

  7. 7. Inspect the PCM (Powertrain Control Module)

    Check for any signs of damage or corrosion on the PCM connectors. Ensure that the PCM is receiving the correct signals from the fuel level sensor

  8. 8. Check for Ground Issues

    Ensure that the fuel level sensor has a good ground connection. A poor ground can lead to communication issues

  9. 9. Look for Short Circuits or Open Circuits

    Use a multimeter to check for continuity in the wiring between the fuel level sensor and the PCM. Look for any short circuits or open circuits that could disrupt communication

  10. 10. Check for Software Updates

    Sometimes, manufacturers release software updates for the PCM that can resolve communication issues. Check with the dealership or manufacturer for any available updates

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has access to specialized diagnostic tools and equipment.Conclusion By following these troubleshooting steps, you can systematically identify and resolve the issue related to the U1455 code. Always refer to the vehicle’s service manual for specific details and specifications related to your make and model