U2359 – Control Module Communication Bus Off.

The ODBII code U2359 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 U2359 is moderate to severe.

Common Causes For: U2355 U2355: Vehicle Communication Bus Malfunction

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus interference
• Software issues or bugs
• Corroded terminals
• Faulty or disconnected sensors
• Low battery voltage or power supply issues

Common misdiagnosis for U2359 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
• Other communication bus errors

Common Troubleshooting Steps

The OBD-II code U2359 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 factors, including wiring issues, module failures, or problems with the communication bus itself. Here are some common troubleshooting steps to diagnose and resolve the 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 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 the Communication Bus: Use a multimeter or an oscilloscope to check the voltage levels and signal integrity on the communication bus (CAN bus, LIN bus, etc.).
• Ensure that the bus is receiving power and that the signal lines are functioning correctly.
• Test Individual Modules: If possible, isolate and test each control module on the communication bus. This can help identify if a specific module is causing the issue.
• Disconnect each module one at a time and check if the code persists after each disconnection.
• Inspect for Short Circuits or Open Circuits: Check for any short circuits or open circuits in the wiring harness that could affect communication.
• Use a wiring diagram to trace the communication lines and ensure continuity.
• Check for Software Updates: Verify if there are any software updates available for the control modules. Sometimes, manufacturers release updates to fix communication issues.
• Reset the Modules: Clear the trouble codes using the OBD-II scanner and see if the code returns. Sometimes, a reset can resolve temporary communication issues.
• Check Battery Voltage: Ensure that the vehicle’s battery is fully charged and that the voltage is within the normal range. Low voltage can cause communication problems.
• Inspect for Environmental Factors: Check for any environmental factors that could affect the communication, such as moisture or extreme temperatures.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented common issues and solutions.1
• Replace Faulty Components: If a specific module is identified as faulty, consider replacing it. Ensure that the replacement module is compatible with the vehicle.1
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician with experience in automotive electronics and communication systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2359 code.