U2764 – Control Module Communication Bus Fault

The ODBII code U2764: 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 U2764 is generally considered moderate to severe.

Common Causes For: U2760 U2760: 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
• Faulty or incompatible aftermarket components
• Low battery voltage or power supply issues
• Communication protocol mismatch

Common misdiagnosis for U2764 U2764: Control Module Communication Bus Fault

• Faulty control module
• Wiring issues or shorts
• Poor ground connections
• Corroded connectors
• Battery or power supply problems
• Software or firmware issues
• Other communication faults in different modules
• Intermittent electrical connections

Common Troubleshooting Steps

The OBD-II code U2764 indicates a “Control Module Communication Bus Fault.” This code typically points to issues with communication 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 trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the communication bus wires (CAN bus, LIN bus, etc.) and ensure they are intact.
• Check for Short Circuits: Use a multimeter to check for short circuits in the communication lines. Ensure that there are no unintended connections between wires.
• Test Control Modules: If possible, test the control modules involved in the communication bus. This may involve checking for proper operation or replacing modules if they are found to be faulty.
• Inspect Ground Connections: Ensure that all ground connections for the control modules are secure and free of corrosion. Poor grounding can lead to communication issues.
• Check for Interference: Look for any aftermarket devices or modifications that may interfere with the communication bus. This includes alarms, stereo systems, or other electronic devices.
• Scan for Communication Issues: Use a professional scan tool to monitor the communication between modules. This can help identify which module is not communicating properly.
• Perform a Network Test: Some advanced scan tools can perform a network test to check the integrity of the communication bus. This can help pinpoint the issue.
• Update Software/Firmware: Check if there are any software or firmware updates available for the control modules. Sometimes, updating the software can resolve communication issues.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1
• 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 issues related to communication faults.1
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2764 code.