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U0105 Lost Communication With Fuel Injector Control Module

The OBD2 code U0105 indicates a loss of communication between the Engine Control Module (ECM) and the Fuel Injector Control Module, which can lead to issues with fuel injection and engine performance

Definition

The OBD2 code U0105 indicates a loss of communication between the Engine Control Module (ECM) and the Fuel Injector Control Module, which can lead to issues with fuel injection and engine performance

Common causes

  • Faulty Fuel Injector Control Module
  • Damaged wiring or connectors
  • Poor electrical connections
  • Failed engine control module (ECM)
  • Short circuit or open circuit in the communication line
  • Corroded connectors
  • Software issues or bugs in the control module
  • Faulty sensors affecting communication
  • Battery or power supply issues

Common misdiagnoses

  • Faulty Fuel Injector Control Module
  • Wiring Issues or Short Circuits
  • Faulty Engine Control Module (ECM)
  • Bad Fuel Injectors
  • Poor Ground Connections
  • Faulty Relays or Fuses
  • Corroded Connectors
  • Software Issues or Updates Needed
  • Faulty Sensors (e.g., Crankshaft or Camshaft Position Sensors)
  • Vacuum Leaks

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 Wiring and Connectors

    Visual Inspection: Check the wiring and connectors related to the Fuel Injector Control Module (FICM) for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or pushed back

  4. 4. Check Power and Ground

    Power Supply: Verify that the FICM is receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connections

    Ensure that the ground connections for the FICM are secure and functioning properly

  6. 6. Inspect the Fuel Injector Control Module

    Module Condition: Check the FICM for any signs of physical damage or water intrusion

  7. 7. Reprogramming

    If applicable, consider reprogramming or updating the FICM software, as this can sometimes resolve communication issues

  8. 8. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harness that connects the FICM to the engine control module (ECM) and other related components

  9. 9. Test the Fuel Injector Control Module

    If possible, test the FICM using a scan tool that can communicate with the module. Check for any abnormal readings or failure to respond

  10. 10. Inspect Related Components

    Check other components that may be related to the fuel injection system, such as the ECM, wiring harnesses, and sensors. Issues in these areas can sometimes lead to communication problems

  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 Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the FICM

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you can systematically identify and address the underlying cause of the U0105 code