WOMS
U code network High severity

U2573 U2573: Control Module Communication Bus Fault

The OBD2 code U2573: Control Module Communication Bus Fault indicates a communication issue between control modules in a vehicle, suggesting that one or more modules are not properly communicating over the vehicle's...

Definition

The OBD2 code U2573: Control Module Communication Bus Fault indicates a communication issue between control modules in a vehicle, suggesting that one or more modules are not properly communicating over the vehicle's data bus

Common causes

  • Faulty control module
  • Damaged wiring or connectors
  • Poor ground connections
  • Short circuits in the communication bus
  • Corroded terminals
  • Intermittent electrical connections
  • Software issues or bugs in the control module
  • Incompatible or malfunctioning aftermarket components
  • Low battery voltage or power supply issues
  • Faulty communication bus (CAN bus) components

Common misdiagnoses

  • Faulty control module
  • Wiring issues or damaged connectors
  • Power supply problems
  • Grounding issues
  • Software glitches or outdated firmware
  • Intermittent communication faults
  • Other unrelated sensor failures
  • Battery or charging system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect Wiring and Connectors

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

  3. 3. Repair or Replace

    If any damaged wires or connectors are found, repair or replace them as necessary

  4. 4. Check for Short Circuits

    Use a multimeter to check for short circuits in the communication lines. Look for continuity between the communication wires and ground or power

  5. 5. Verify Power and Ground

    Ensure that the control modules have the proper power supply and ground connections. Use a multimeter to check voltage and ground integrity

  6. 6. Inspect the Communication Bus

    Check the CAN (Controller Area Network) bus or other communication protocols used in the vehicle. Look for any interruptions or faults in the bus lines

  7. 7. Use an oscilloscope if available to monitor the communication signals for irregularities

  8. 8. Check for Module Functionality

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

  9. 9. Clear Codes and Test Drive

    After performing any repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  10. 10. Update Software/Firmware

    Check if there are any software updates available for the vehicle’s control modules. Sometimes, communication issues can be resolved with a software update

  11. 11. 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 known issues related to communication faults

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics.Conclusion Troubleshooting a U2573 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 ensure safety precautions are taken when working on vehicle electrical systems