U1679 – Invalid Data Received from Vehicle Control Module.

The ODBII code U1679 indicates that the vehicle’s control module has received invalid or corrupted data from another control module, which may affect vehicle performance or functionality.

The severity of ODBII code U1679 is generally considered moderate.

Common Causes For: U1678 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Poor or damaged wiring/connectors
• Corrupted software or firmware in the VCM
• Communication issues between modules
• Low battery voltage or electrical issues
• Faulty sensors sending incorrect data
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1679 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty sensors or actuators
• Corrupted software or firmware in the VCM
• Issues with the power supply to the VCM
• Problems with other control modules in the vehicle
• Incorrectly installed aftermarket accessories or modifications

Common Troubleshooting Steps

The OBD-II code U1679 indicates that there is invalid data being received from the vehicle control module (VCM). This can be caused by various issues, including communication problems, wiring issues, or faults in the control modules themselves. Here are some common troubleshooting steps to diagnose and resolve the U1679 code:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide more context about the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors related to the VCM and any other modules involved in the communication network.
• Look for signs of damage, corrosion, or loose connections.
• Repair or replace any damaged wiring or connectors.
• Check for Communication Issues:
• Ensure that the communication lines (CAN bus) are functioning properly. Use a multimeter to check for continuity and proper voltage levels.
• If you have access to a scan tool that can monitor live data, check if the VCM is communicating with other modules.
• Inspect the Control Modules:
• If the wiring and connections are good, the issue may lie within the control modules themselves. Check for any signs of physical damage or water intrusion.
• If possible, perform a software update on the VCM and other related modules, as outdated software can sometimes cause communication issues.
• Reset the Codes:
• After performing any repairs or inspections, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Check Battery and Ground Connections:
• Ensure that the vehicle’s battery is in good condition and that all ground connections are secure. Poor power supply or grounding can lead to communication errors.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1679 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in diagnosing the problem.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle’s specific systems. By following these steps, you should be able to identify and resolve the underlying issue causing the U1679 code.