U1116 – Lost Communication with Vehicle Dynamics Control Module.

The ODBII code U1116 indicates a loss of communication between the vehicle’s onboard computer and the Vehicle Dynamics Control Module, which may affect systems like traction control and stability control.

The severity of ODBII code U1116 is generally considered moderate to severe.

Common Causes For: U1115 SCP (J1850) Invalid or Missing Data for Charging System

• Faulty Vehicle Dynamics Control Module (VDCM)
• Damaged wiring or connectors
• Poor electrical connections
• Faulty or corroded ground connections
• Malfunctioning CAN bus communication
• Software issues or programming errors
• Other related module failures
• Battery or power supply issues

Common misdiagnosis for U1116 Lost Communication with Vehicle Dynamics Control Module.

• Faulty ABS module
• Wiring issues or shorts
• Bad wheel speed sensors
• Faulty engine control module (ECM)
• Incorrectly diagnosed transmission issues
• Power supply problems
• Faulty brake control module
• Software or firmware issues in the control modules

Common Troubleshooting Steps

When dealing with the OBD-II code U1116, 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, other codes can provide context or indicate related issues.
• 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 module’s software, as a software glitch can sometimes cause communication issues.
• Check for Communication Issues: **CAN Bus Communication: Since the VDCM communicates over the CAN bus, check for issues with the CAN network. Look for other modules that may not be communicating properly.
• **Scan Tool Communication: Use a scan tool to see if you can communicate with the VDCM. If you can’t, it may indicate a problem with the module or the communication lines.
• Inspect Related Components: **Other Modules: Check other modules that communicate with the VDCM, such as the ABS module or traction control module, for any issues.
• **Fuses: Inspect relevant fuses to ensure they are not blown.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect and see if the code reappears.
• Test Drive the Vehicle: After performing the above checks and repairs, take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the U1116 code or the VDCM. There may be known issues or recalls that apply to your vehicle.
• Professional Diagnosis: If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues.Conclusion Troubleshooting the U1116 code involves a systematic approach to check for communication issues, inspect wiring and connections, and ensure that the VDCM is functioning correctly. Following these steps can help identify the root cause of the problem.