U1326 – Invalid Data Received from Vehicle Dynamics Control Module.

The ODBII code U1326 indicates that the vehicle’s control module has received invalid or erroneous data from the Vehicle Dynamics Control Module, which may affect the vehicle’s stability and handling systems.

The severity of ODBII code U1326 is generally considered moderate.

Common Causes For: U1325 Lost Communication with the Hybrid Powertrain Control Module (HPCM)”.

• Faulty Vehicle Dynamics Control Module (VDCM)
• Poor or damaged wiring/connectors between the VDCM and the ECU
• Corrupted or incorrect software in the VDCM
• Malfunctioning sensors related to vehicle dynamics (e.g., wheel speed sensors)
• Communication issues within the CAN bus network
• Low battery voltage or electrical system issues
• Faulty ECU (Engine Control Unit) or other related control modules
• Grounding issues affecting the VDCM or related components

Common misdiagnosis for U1326 Invalid Data Received from Vehicle Dynamics Control Module.

• Faulty Vehicle Dynamics Control Module
• Wiring issues or short circuits in the communication lines
• Faulty ABS module
• Incorrectly diagnosed wheel speed sensors
• Power supply issues to the control modules
• Software or firmware issues in the control modules
• Faulty engine control module (ECM) or transmission control module (TCM)

Common Troubleshooting Steps

When dealing with the OBD-II code U1326, which indicates “Invalid Data Received from Vehicle Dynamics Control Module,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors related to the Vehicle Dynamics Control Module (VDCM). Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Check the Vehicle Dynamics Control Module:
• If the wiring and connectors appear to be in good condition, the next step is to check the VDCM itself. This may involve testing the module for proper operation or checking for software updates.
• If possible, compare the module’s data with a known good module.
• Inspect Related Components:
• Check other components that may interact with the VDCM, such as wheel speed sensors, steering angle sensors, and yaw rate sensors. Ensure they are functioning correctly and that their wiring is intact.
• Perform a System Reset:
• Sometimes, clearing the code and resetting the system can resolve temporary glitches. Use the OBD-II scanner to clear the code and see if it returns after a test drive.
• Check for Ground Issues:
• Ensure that the VDCM has a good ground connection. Poor grounding can lead to erratic behavior and communication issues.
• Inspect the Power Supply:
• Verify that the VDCM is receiving the correct voltage and that there are no issues with the power supply circuit.
• Look for Software Updates:
• Check if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix known issues.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the U1326 code or the VDCM for your specific vehicle make and model. Manufacturers may have specific recommendations for addressing this code.
• Professional Diagnosis:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s systems. They may have specialized diagnostic tools and knowledge to pinpoint the problem. By following these steps, you can systematically identify and address the underlying issue causing the U1326 code.