U1189 – Lost Communication with Fuel Level Sensor.
The ODBII 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.
The severity of ODBII code U1189 is generally considered moderate.
Common Causes For: U1188 U1188: “Module Communication Failure”
- 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 misdiagnosis for U1189 Lost Communication with Fuel Level Sensor.
- 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
Common Troubleshooting Steps
When dealing with the OBD-II code U1189, which indicates “Lost Communication with Fuel Level Sensor,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:
- 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.
- Inspect the Fuel Level Sensor: **Location: The fuel level sensor is typically located in the fuel tank.
- **Visual Inspection: Check for any visible damage to the sensor or its wiring. Look for frayed wires, corrosion, or loose connections.
- 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.
- Look for any signs of wear or damage to the wiring that could cause a loss of communication.
- 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.
- If the sensor is faulty, it may need to be replaced.
- 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.
- 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.
- Check for Ground Issues: Ensure that the ground connections for the fuel level sensor and related components are secure and free from corrosion.
- 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.
- 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.
- 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
- 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.