WOMS
U code network Medium severity

U2490 U2490: "Module Communication Failure

The OBD2 code U2490 indicates a communication failure between modules in a vehicle's network, suggesting that one or more control modules are not properly communicating with each other

Definition

The OBD2 code U2490 indicates a communication failure between modules in a vehicle's network, suggesting that one or more control modules are not properly communicating with each other

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning module
  • Corrupted software or firmware in the module
  • Poor ground connections
  • Interference from other electronic devices
  • Low battery voltage or power supply issues
  • Communication network issues (e.g., CAN bus problems)
  • Water intrusion or damage to the module

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Software issues or updates needed
  • Power supply problems
  • Grounding issues
  • Intermittent communication issues
  • Other communication protocol failures

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or lead you to the root cause of the communication failure

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the ground connections, as poor grounding can lead to communication issues

  5. 5. Check Power Supply

    Ensure that the affected module is receiving the proper voltage. Use a multimeter to check the power supply to the module

  6. 6. Test the Module

    If possible, test the affected module to ensure it is functioning correctly. This may involve bench testing or swapping with a known good module

  7. 7. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harness. A short can disrupt communication between modules

  8. 8. Inspect the CAN Bus

    If the vehicle uses a Controller Area Network (CAN) bus for communication, check the integrity of the CAN bus wiring. Look for any breaks or shorts in the bus lines

  9. 9. Check for Interference

    Sometimes, aftermarket accessories or modifications can interfere with module communication. Disconnect any non-factory equipment to see if the issue resolves

  10. 10. Update Software/Firmware

    Check if there are any software or firmware updates available for the vehicle's modules. Sometimes, communication issues can be resolved with an update

  11. 11. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears

  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 communication issues. 1

  13. 13. Professional Diagnosis

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. They may have specialized tools and knowledge to pinpoint the problem. By following these steps, you can systematically identify and address the underlying cause of the U2490 code