U2573 – Control Module Communication Bus Fault

The ODBII 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.

The severity of ODBII code U2573 is generally considered moderate to severe.

Common Causes For: U2572 U2572: Control Module Communication Bus Fault

• 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 misdiagnosis for U2573 U2573: Control Module Communication Bus Fault

• 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• Software glitches or outdated firmware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

Common Troubleshooting Steps

The OBD-II code U2573 indicates a “Control Module Communication Bus Fault.” This code typically points to a communication issue between various control modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• 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.
• 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.
• **Repair or Replace: If any damaged wires or connectors are found, repair or replace them as necessary.
• 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.
• 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.
• 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.
• Use an oscilloscope if available to monitor the communication signals for irregularities.
• 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.
• 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.
• 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.
• 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.
• 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.