WOMS
U code network Medium severity

U1487 U1487: Control Module Communication Failure

The OBD2 code U1487 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 U1487 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
  • 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
  • Failed or malfunctioning sensors

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Faulty sensors
  • Battery or power supply issues
  • Intermittent connection problems
  • Other communication errors in the network

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 about 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 modules

  4. 4. Check for Ground Issues

    Ensure that all ground connections for the control modules are secure and free of corrosion. Poor grounding can lead to communication failures

  5. 5. Test the Control Modules

    If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve using a scan tool to check for communication with the module

  6. 6. If you have access to a known good module, you can swap it in to see if the issue resolves

  7. 7. Inspect the CAN Bus

    The U1487 code may be related to issues with the Controller Area Network (CAN) bus. Check for any shorts, opens, or faults in the CAN wiring

  8. 8. Use a multimeter or oscilloscope to check the CAN bus signals for proper voltage levels and signal integrity

  9. 9. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the control modules

  10. 10. Clear Codes and Test Drive

    After performing inspections 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)

    Look for any TSBs related to the U1487 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues.Conclusion Troubleshooting a U1487 code can be complex due to the nature of vehicle communication systems. Following these steps systematically can help identify and resolve the underlying issue. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle