U2320 – Module Communication Fault

The ODBII code U2320: Module Communication Fault indicates a communication issue between the vehicle’s control modules, suggesting that one or more modules are not properly exchanging data.

The severity of ODBII code **U2320: Module Communication Fault** is generally considered moderate to severe.

Common Causes For: U2245: Vehicle Communication Bus Malfunction

• Faulty wiring or connectors
• Failed control module
• Corroded or damaged pins
• Poor ground connections
• Intermittent communication issues
• Software or firmware issues
• Low battery voltage
• Electrical interference
• Faulty CAN bus network components
• Incorrectly configured aftermarket accessories

Common misdiagnosis for U2320: Module Communication Fault

• Faulty wiring or connectors
• Defective control module
• Power supply issues
• Grounding problems
• Software or firmware issues
• Intermittent communication issues
• Other communication protocol faults
• Sensor malfunctions
• Battery or charging system problems
• Corrupted data or configuration settings

Common Troubleshooting Steps

The OBD-II code **U2320: Module Communication Fault** indicates a communication issue between the vehicle’s control modules. This can be caused by various factors, including wiring issues, faulty modules, or problems with the vehicle’s network. 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 trouble codes that may be present. This can provide more context about the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring harnesses and connectors associated with the affected modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication faults.
• Check Module Power Supply:
• Ensure that the affected modules are receiving the proper voltage and ground. Use a multimeter to check the power supply to the modules.
• Test Communication Lines:
• Use a scan tool to check the communication lines (CAN bus, LIN bus, etc.) for continuity and proper voltage levels. Look for any short circuits or open circuits in the communication lines.
• Inspect for Interference:
• Check for any aftermarket devices or modifications that may interfere with the vehicle’s communication network. This includes alarms, stereo systems, or other electronic devices.
• Perform a Network Test:
• If available, use a professional scan tool to perform a network test. This can help identify which module is not communicating properly.
• Check for Software Updates:
• Verify if there are any software updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with a software update.
• Reset the Modules:
• Clear the trouble codes using a scan tool and see if the code returns. Sometimes, a temporary glitch can cause communication faults.
• Replace Faulty Modules:
• If a specific module is identified as faulty and not communicating, consider replacing it. Ensure that the replacement module is compatible with the vehicle.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the U2320 code and the modules involved. 1
• 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. By following these steps, you can systematically diagnose and potentially resolve the U2320 communication fault.