U2107 – Lost Communication with Vehicle Control Module.

The ODBII code U2107 indicates that there is a loss of communication between the vehicle’s control module and other modules in the network, which may affect the vehicle’s performance and functionality.

The severity of OBDII code U2107 is generally considered moderate to severe.

Common Causes For: U2106 Lost Communication with Vehicle Dynamics Control Module.

• Faulty Vehicle Control Module (VCM)
• Damaged wiring or connectors
• Poor ground connections
• Corrupted software or firmware
• Faulty communication lines (CAN bus issues)
• Malfunctioning other control modules
• Battery or power supply issues
• Intermittent electrical connections

Common misdiagnosis for U2107 Lost Communication with Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty or corroded connectors
• Issues with other control modules (e.g., Engine Control Module, Transmission Control Module)
• Battery or power supply problems
• Software or firmware issues in the control modules
• Faulty sensors that affect communication
• Grounding issues in the electrical system

Common Troubleshooting Steps

The OBD-II code U2107 indicates a “Lost Communication with Vehicle Control Module.” This code typically suggests that there is a communication issue between the vehicle’s control modules, which can be caused by various factors. Here are some common troubleshooting steps to help diagnose and resolve the issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate which module is having communication issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the affected control module. 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 module is receiving the proper voltage. Use a multimeter to check the power supply to the module.
• Verify that the fuses related to the control module are intact and functioning.
• Test the Control Module:
• If possible, test the control module itself. This may involve using specialized diagnostic tools or swapping the module with a known good one to see if the issue persists.
• Inspect the CAN Bus:
• The communication between modules often occurs over the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use a CAN bus scanner to monitor the communication and identify any anomalies.
• Check for Software Updates:
• Sometimes, communication issues can be resolved with a software update. Check with the manufacturer for any available updates for the control modules.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to U2107.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources. By following these steps, you can systematically diagnose and potentially resolve the U2107 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle.