U1184 – Lost Communication with Fuel Level Sensor.

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The ODBII code U1184 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 U1184 is generally considered moderate.

Common Causes For: U1183 SCP (J1850) Invalid or Missing Data for Primary Id

  • Faulty fuel level sensor
  • Damaged wiring or connectors
  • Poor ground connection
  • Malfunctioning 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 misdiagnosis for U1184 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 cluster malfunction
  • Issues with the fuel pump module
  • Problems with the body control module (BCM)

Common Troubleshooting Steps

When dealing with the OBD-II code U1184, 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 Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with the fuel level sensor for any signs of damage, corrosion, or loose connections.
  • **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or pushed back.
  • Test the Fuel Level Sensor: **Resistance Check: Use a multimeter to measure the resistance of the fuel level sensor. Compare the readings to the specifications provided in the vehicle’s service manual.
  • **Functionality Test: If possible, test the sensor by applying a known voltage and checking the output signal.
  • Check the Fuel Level Sensor Circuit: **Continuity Test: Perform a continuity test on the wiring between the fuel level sensor and the engine control module (ECM) to ensure there are no breaks in the circuit.
  • **Voltage Test: Check for proper voltage supply to the fuel level sensor. Ensure that the sensor is receiving the correct voltage as specified in the service manual.
  • Inspect the ECM: **Connections: Check the connections at the ECM for any signs of damage or corrosion.
  • **Software Updates: Ensure that the ECM has the latest software updates, as sometimes communication issues can be resolved with a software update.
  • Check for Ground Issues: Ensure that the fuel level sensor has a good ground connection. A poor ground can lead to communication issues.
  • Scan for Communication Issues: Use a scan tool to check for communication between the ECM and the fuel level sensor. If the sensor is not communicating, it may need to be replaced.
  • Inspect Related Components: Check other components that may affect the fuel level sensor, such as the fuel pump module or any related control modules.
  • Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code reappears.
  • 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 advanced diagnostic tools and equipment. By following these steps, you should be able to identify the cause of the U1184 code and take appropriate action to resolve the issue.

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