WOMS
U code network Medium severity

U1189 Lost Communication with Fuel Level Sensor

The OBD2 code U1189 indicates a loss of communication between the vehicle's control module and the fuel level sensor, which may affect the accurate reading of the fuel level

Definition

The OBD2 code U1189 indicates a loss of communication between the vehicle's control module and the fuel level sensor, which may affect the accurate reading of the fuel level

Common causes

  • Faulty fuel level sensor
  • Damaged wiring or connectors
  • Poor ground connection
  • Failed fuel gauge module
  • Malfunctioning engine control module (ECM)
  • Corroded terminals
  • Short circuit in the wiring harness
  • Software issues or glitches in the vehicle's computer system

Common misdiagnoses

  • Faulty fuel level sensor
  • Wiring issues or shorts in the harness
  • Faulty engine control module (ECM)
  • Corroded connectors
  • Fuel gauge malfunction
  • Instrument cluster issues
  • Faulty ground connections
  • Software glitches in the vehicle's computer 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 and help identify related issues

  2. 2. Inspect the Fuel Level Sensor

    Location: The fuel level sensor is typically located in the fuel tank

  3. 3. Visual Inspection

    Check for any visible damage to the sensor or its wiring. Look for frayed wires, corrosion, or loose connections

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness and connectors leading to the fuel level sensor. Ensure that all connections are secure and free from corrosion

  5. 5. Look for any signs of wear or damage to the wiring that could cause a loss of communication

  6. 6. Test the Fuel Level Sensor

    If accessible, test the fuel level sensor using a multimeter. Check for proper resistance values according to the manufacturer’s specifications

  7. 7. If the sensor is faulty, it may need to be replaced

  8. 8. Check the Fuel Pump Module

    In some vehicles, the fuel level sensor is part of the fuel pump module. Ensure that the entire module is functioning correctly

  9. 9. Inspect the Body Control Module (BCM)

    The BCM may be responsible for communicating with the fuel level sensor. Check for any issues with the BCM, including software updates or faults

  10. 10. Check for Ground Issues

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

  11. 11. Scan for Communication Issues

    Use a professional-grade scan tool to check for communication issues between the fuel level sensor and the vehicle’s computer systems. Look for any communication faults

  12. 12. Perform a System Reset

    After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the fuel level sensor or communication issues for your specific vehicle make and model. Manufacturers may have issued guidance on common problems.1

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who can perform more advanced diagnostics.Conclusion By following these troubleshooting steps, you can systematically identify and resolve the issue related to the U1189 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle model