WOMS
U code network Medium severity

U2347 U2347: "Control Module Communication Fault

The OBD2 code U2347 indicates a "Control Module Communication Fault," which means there is a problem with the communication between various control modules in the vehicle's network

Definition

The OBD2 code U2347 indicates a "Control Module Communication Fault," which means there is a problem with the communication between various control modules in the vehicle's network

Common causes

  • Faulty control module
  • Poor electrical connections
  • Damaged wiring harness
  • Corroded connectors
  • Software issues or bugs
  • Low battery voltage
  • Interference from aftermarket devices
  • Faulty CAN bus communication
  • Grounding issues

Common misdiagnoses

  • Faulty control module
  • Wiring issues or damaged connectors
  • Corrupted software or firmware in the control module
  • Battery or power supply problems
  • Grounding issues
  • Intermittent communication faults
  • Faulty sensors or actuators
  • Incorrectly configured or incompatible aftermarket parts

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors related to the control modules for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Verify Power and Ground

    Check that the affected control module(s) are receiving the proper power and ground. Use a multimeter to measure voltage and continuity

  5. 5. Check Communication Lines

    Inspect the CAN (Controller Area Network) bus lines for continuity and shorts. Use a multimeter to check for proper resistance and ensure there are no breaks in the wiring

  6. 6. Test Control Modules

    If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve swapping with a known good module if available

  7. 7. Clear Codes and Test Drive

    Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. This can help determine if the issue is intermittent

  8. 8. Check for Software Updates

    Sometimes, control modules may require software updates. Check with the manufacturer or a dealership to see if there are any updates available for the modules in question

  9. 9. Inspect for Environmental Factors

    Look for any environmental factors that could affect communication, such as water intrusion or excessive heat

  10. 10. Consult Technical Service Bulletins (TSBs)

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

  11. 11. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle.Conclusion Troubleshooting OBD-II code U2347 requires a systematic approach to identify the root cause of the communication fault. By following these steps, you can narrow down the potential issues and work towards a resolution