U1673 – Invalid Data Received from Vehicle Control Module.

The ODBII code U1673 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 U1673 is generally considered moderate.

Common Causes For: U1672 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
• Faulty sensors sending incorrect data
• Grounding issues
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1673 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty sensors related to vehicle control
• Issues with the Engine Control Module (ECM)
• Problems with the Transmission Control Module (TCM)
• Corrupted software or firmware in the control modules
• Battery or power supply issues affecting module communication
• Incorrectly installed aftermarket accessories or modifications

Common Troubleshooting Steps

The OBD-II code U1673 indicates that the vehicle’s control module has received invalid data from another control module. 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 U1673 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help pinpoint the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the control modules involved. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the modules, as these can be prone to wear and tear.
• Check for Software Updates:
• Verify if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix known issues.
• Perform a Hard Reset:
• Disconnect the vehicle’s battery for a few minutes to reset the control modules. Reconnect the battery and see if the code reappears.
• Inspect Control Modules:
• If the problem persists, check the control modules for any signs of damage or malfunction. This may involve testing the modules or replacing them if necessary.
• Check for Ground Issues:
• Ensure that all ground connections are secure and free of corrosion. Poor grounding can lead to communication issues between modules.
• Test Communication Lines:
• Use a multimeter or an oscilloscope to test the communication lines (CAN bus) between the control modules. Look for any interruptions or irregular signals.
• Check for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with the communication between modules.
• Consult Technical Service Bulletins (TSBs):
• Look up any TSBs related to the U1673 code for your specific vehicle make and model. Manufacturers may have documented common issues and solutions.
• Professional Diagnosis:
• If you are unable to resolve the issue, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle. By following these steps, you should be able to identify and resolve the underlying issue causing the U1673 code.