U2116 – Lost Communication with Vehicle Dynamics Control Module.

The ODBII code U2116 indicates a loss of communication with the Vehicle Dynamics Control Module, which may affect the vehicle’s stability and traction control systems.

The severity of ODBII code U2116 is typically considered moderate to severe.

Common Causes For: U2115 Lost Communication with Vehicle Control Module.

• Faulty Vehicle Dynamics Control Module (VDCM)
• Damaged or corroded wiring or connectors
• Poor ground connection
• Faulty communication lines (CAN bus issues)
• Malfunctioning power supply to the VDCM
• Software or firmware issues in the VDCM
• Other related module failures affecting communication

Common misdiagnosis for U2116 Lost Communication with Vehicle Dynamics Control Module.

• Faulty ABS module
• Defective wheel speed sensors
• Wiring issues or shorts in the communication lines
• Malfunctioning engine control module (ECM)
• Incorrectly diagnosed transmission issues
• Battery or power supply problems
• Faulty body control module (BCM)
• Software or firmware issues in the vehicle’s control modules

Common Troubleshooting Steps

When dealing with the OBD-II code U2116, which indicates “Lost Communication with Vehicle Dynamics Control Module,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context about the issue.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the Vehicle Dynamics Control Module (VDCM) for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or damaged.
• Check Power and Ground: **Power Supply: Verify that the VDCM is receiving the correct voltage. Use a multimeter to check the power supply to the module.
• **Ground Connection: Ensure that the ground connection for the VDCM is secure and functioning properly.
• Inspect the Vehicle Dynamics Control Module: **Module Condition: Check the VDCM for any physical damage or signs of failure.
• **Reprogramming: If applicable, consider reprogramming or updating the software of the VDCM, as software issues can sometimes cause communication problems.
• Check for Communication Issues: **CAN Bus Communication: Since the VDCM communicates over the CAN bus, check the CAN bus wiring for shorts, opens, or other issues.
• **Scan Tool Communication: Use a scan tool to see if you can communicate with the VDCM. If you cannot, it may indicate a problem with the module or the communication lines.
• Inspect Related Modules: **Other Modules: Check other modules that communicate with the VDCM. If another module is malfunctioning, it could affect communication.
• **Network Integrity: Ensure that the entire communication network is functioning properly.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect and see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U2116 code or the VDCM for your specific vehicle make and model. Manufacturers may have specific fixes or updates.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose the problem more effectively.
• Document Findings: Keep a record of all findings, repairs, and any codes that appear during the troubleshooting process. This documentation can be helpful for future reference or if you need to consult a professional. By following these steps, you should be able to identify the root cause of the U2116 code and take appropriate action to resolve the issue.