U2710 – Control Module Communication Bus Off.

The ODBII code U2710 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 U2710 is typically considered moderate to severe.

Common Causes For: U2709 Invalid Data Received from Vehicle Control Module.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus interference
• Faulty or damaged CAN bus
• Software issues or firmware corruption
• Low battery voltage or power supply issues
• Corroded terminals or connectors

Common misdiagnosis for U2710 Control Module Communication Bus Off.

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

Common Troubleshooting Steps

The OBD-II code U2710 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, faulty modules, 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 additional context for 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 Control Modules: Identify the control module(s) that are part of the communication bus. This may include modules like the Engine Control Module (ECM), Transmission Control Module (TCM), Body Control Module (BCM), etc.
• If possible, test the affected control module(s) for proper operation. This may involve checking for power and ground at the module, as well as verifying that it is functioning correctly.
• Test the Communication Bus: Use a multimeter or an oscilloscope to check the communication signals on the bus. Look for proper voltage levels and signal integrity.
• If you have access to a scan tool that can monitor live data, check for communication between modules.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for short circuits or open circuits in the wiring harness. This can help identify any breaks or shorts that may be causing the communication issue.
• Inspect for Interference: Check for any aftermarket devices or modifications that may be interfering with the communication bus. This includes things like alarm systems, stereo installations, or other electronic devices.
• Reset the Control Modules: Sometimes, resetting the control modules can resolve communication issues. This can be done by disconnecting the battery for a few minutes or using a scan tool to clear the codes.
• Update or Reprogram Control Modules: If the control module is not functioning correctly, it may need to be updated or reprogrammed. Check with the manufacturer for any available updates.
• Replace Faulty Components: If a specific control module is determined to be faulty after testing, it may need to be replaced.
• 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 communication bus problems.1
• Seek Professional Help: If the issue persists after performing these 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 cause of the U2710 code.