U2375 – Control Module Communication Bus Off.

The ODBII code U2375 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 U2375 is moderate to severe.

Common Causes For: U2374 Control Module Communication Bus Off.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus failure
• Short circuit in the communication lines
• Corroded connectors
• Software issues or bugs in the control module
• Interference from aftermarket devices or modifications

Common misdiagnosis for U2375 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corroded connectors
• Battery or power supply problems
• Software glitches
• Faulty sensors
• Communication network issues
• Incorrectly installed aftermarket components
• Intermittent faults in the communication bus

Common Troubleshooting Steps

The OBD-II code U2375 indicates a communication issue on the control module communication bus, specifically that a control module is “off” or not communicating properly. This can be caused by various factors, including wiring issues, module failures, or software problems. Here are some common troubleshooting steps to diagnose and resolve the U2375 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 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 control modules have the proper power supply. Use a multimeter to check voltage at the module connectors.
• Verify that fuses related to the control modules are intact.
• Test the Control Modules: If possible, test the affected control module(s) for functionality. This may involve using specialized diagnostic tools or swapping with a known good module.
• Check for any software updates or reprogramming requirements for the control modules.
• Inspect the Communication Bus: Check the integrity of the communication bus (CAN bus, LIN bus, etc.). Look for shorts, opens, or resistance issues in the wiring.
• Use an oscilloscope to monitor the communication signals on the bus to ensure they are within specifications.
• Clear Codes and Test Drive: After performing inspections and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the performance of the affected systems.
• Check for Intermittent Issues: If the code returns intermittently, consider that there may be a loose connection or a failing component that only manifests under certain conditions.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the U2375 code or the control modules in question. There may be known issues or fixes available.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional technician or a dealership with advanced diagnostic capabilities. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U2375 code.