U1114 – Lost Communication with Vehicle Dynamics Control Module.

The ODBII code U1114 indicates a loss of communication between the vehicle’s control module and the Vehicle Dynamics Control Module, which may affect systems related to stability and traction control.

The severity of ODBII code U1114 is generally considered moderate to severe.

Common Causes For: U1113 SCP (J1850) Invalid or Missing Data for Primary Id

• 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 U1114 Lost Communication with Vehicle Dynamics Control Module.

• Faulty ABS module
• Wiring issues or shorts
• Faulty wheel speed sensors
• Malfunctioning engine control module (ECM)
• Incorrectly calibrated or faulty steering angle sensor
• Battery or charging system problems
• Faulty traction control system components
• Software issues or updates needed in the vehicle’s control modules

Common Troubleshooting Steps

When dealing with the OBD-II code U1114, 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: The VDCM communicates over the CAN bus. Use a scan tool to check if other modules are communicating properly. If other modules are also having communication issues, it may indicate a problem with the CAN bus itself.
• **Bus Termination: Ensure that the CAN bus is properly terminated. A missing or faulty termination resistor can lead to communication problems.
• Test the VDCM: If possible, perform a bench test of the VDCM to ensure it is functioning correctly. This may require specialized equipment or tools.
• Check for Environmental Factors: **Moisture and Corrosion: Inspect for moisture intrusion or corrosion in the module or connectors, which can lead to communication failures.
• **Temperature: Ensure that the module is not overheating, as excessive heat can cause electronic components to fail.
• 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 returns.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the U1114 code or the VDCM. There may be known issues or recalls that could apply to your vehicle.
• 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 your specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and address the underlying cause of the U1114 code.