U2350 – Control Module Communication Bus Off.

The ODBII code U2350 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 U2350 is moderate to severe.

Common Causes For: U2349 U2349: “Control Module Communication Failure”

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus interference
• Software or firmware issues
• Short circuits in the communication lines
• Open circuits in the communication lines
• Corroded connectors or terminals
• Faulty or incompatible aftermarket parts
• Low battery voltage or power supply issues

Common misdiagnosis for U2350 Control Module Communication Bus Off.

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

Common Troubleshooting Steps

The OBD-II code U2350 indicates a communication issue on the control module communication bus, specifically that a module is “off” or not communicating properly. This can be caused by various issues, including wiring problems, module failures, or issues with the communication bus itself. Here are some common troubleshooting steps to diagnose and resolve the U2350 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide additional context for the issue.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors related to the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors for the modules involved in the communication bus.
• Check Power and Ground: Verify that the affected control module(s) have proper power and ground connections. Use a multimeter to check voltage and ground continuity.
• Ensure that the fuses related to the control modules are intact.
• Test the Communication Bus: Use a scan tool to monitor the communication bus. Check for signals on the CAN (Controller Area Network) or other communication lines.
• If possible, use an oscilloscope to analyze the bus signals for any irregularities.
• Inspect Control Modules: If a specific module is suspected to be faulty, consider testing or replacing it. This may involve swapping it with a known good module if available.
• Ensure that the module is properly programmed and configured for the vehicle.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for short circuits or open circuits in the communication lines. This may involve tracing the wiring harness and checking continuity.
• Look for Interference: Check for any aftermarket devices or modifications that may interfere with the communication bus. This includes alarms, stereo systems, or other electronic devices.
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the U2350 code.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U2350 code.