U2367 – Control Module Communication Bus Off.

The ODBII code U2367 indicates a communication issue where a control module is unable to communicate over the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2367 is moderate to high.

Common Causes For: U2366 U2366: Control Module Communication Bus Failure

• Faulty control module
• Poor electrical connections or wiring issues
• Short circuits in the communication bus
• Corroded connectors
• Faulty or damaged communication bus wiring
• Software or firmware issues in the control module
• Interference from aftermarket devices
• Low battery voltage or power supply issues

Common misdiagnosis for U2367 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Battery or power supply issues
• Intermittent connection problems
• Incorrectly installed aftermarket accessories

Common Troubleshooting Steps

The OBD-II code U2367 indicates a communication issue on the control module communication bus, specifically that a module is “off” or not communicating properly. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide context or indicate which module is having issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the control modules on the communication bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication issues.
• Check Power Supply:
• Ensure that the affected control module(s) are receiving the proper voltage. Use a multimeter to check the power supply to the module.
• Verify that the fuses related to the control modules are intact.
• Test the Control Module:
• If you suspect a specific control module is at fault, you can test it by checking its functionality or replacing it with a known good module.
• Some vehicles may allow you to perform a self-test on the module using a scan tool.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the communication lines. A short can cause the module to go offline.
• Inspect the Communication Bus:
• Check the integrity of the communication bus (CAN bus, LIN bus, etc.). Look for any interruptions or faults in the bus wiring.
• Use an oscilloscope or a specialized scan tool to monitor the communication signals on the bus.
• Reset the Modules:
• Sometimes, simply resetting the control modules can resolve communication issues. Disconnect the battery for a few minutes, then reconnect it and see if the code returns.
• Update Software/Firmware:
• Check if there are any software or firmware updates available for the control modules. Sometimes, communication issues can be resolved with an update.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have identified common issues and provided solutions.
• Professional Diagnosis:
• If the issue persists after performing the above steps, it may be necessary to seek professional help. A qualified technician can perform more advanced diagnostics and repairs. By following these steps, you should be able to identify and resolve the issue related to the U2367 code. Always refer to the vehicle’s service manual for specific procedures and specifications.