WOMS
U code network Medium severity

U1481 U1481: Control Module Communication Failure

The OBD2 code U1481 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not properly communicating with each other

Definition

The OBD2 code U1481 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not properly communicating with each other

Common causes

  • Faulty control module
  • Damaged wiring or connectors
  • Poor ground connections
  • Corroded terminals
  • Software issues or bugs
  • Intermittent electrical connections
  • Faulty communication bus (CAN bus) issues
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty control module
  • Wiring issues or shorts
  • Poor ground connections
  • Corroded connectors
  • Software glitches or updates needed
  • Battery or power supply problems
  • Intermittent communication issues
  • Faulty sensors or actuators related to the control module

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

    Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harnesses that connect the affected control module to the rest of the vehicle

  4. 4. Check Power and Ground

    Verify that the control module has the proper power supply and ground. Use a multimeter to check for voltage at the module's power and ground pins

  5. 5. If there is no power or ground, trace the wiring back to the fuse box or battery to identify the issue

  6. 6. Test the Control Module

    If the wiring and connections are intact, the control module itself may be faulty. If possible, test the module in another vehicle or replace it with a known good module to see if the problem persists

  7. 7. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the manufacturer or a dealership to see if there are any updates available for the control module

  8. 8. Inspect for Interference

    Look for any aftermarket devices or modifications that may interfere with the communication between control modules. This includes alarm systems, stereo systems, or other electronic devices

  9. 9. Perform a Network Test

    Use a scan tool capable of performing a network test to check the communication between modules. This can help identify which module is not communicating properly

  10. 10. 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

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers often release TSBs for known issues that can provide guidance on troubleshooting and repairs

  12. 12. 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 control systems. By following these troubleshooting steps, you can systematically identify and resolve the communication failure indicated by the U1481 code