U2674 – Invalid Data Received from Vehicle Control Module.

The ODBII code U2674 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 U2674 is generally considered moderate.

Common Causes For: U2673 U2673: “Vehicle Communication Bus Malfunction”

• Faulty Vehicle Control Module (VCM)
• Corrupted software or firmware in the VCM
• Poor or damaged wiring/connectors in the communication circuit
• Faulty sensors sending incorrect data
• Issues with the OBDII port or scanner
• Interference from aftermarket devices or modifications
• Low battery voltage or electrical issues in the vehicle
• Communication issues between modules (CAN bus problems)

Common misdiagnosis for U2674 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty sensors related to the VCM
• 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
• Grounding issues in the vehicle’s electrical system

Common Troubleshooting Steps

The OBD-II code U2674 indicates that there is invalid data being received from the vehicle control module (VCM). This can be caused by various issues, including communication problems between modules, wiring issues, or faults within the modules themselves. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the VCM and any related modules. Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely plugged in and that there are no bent pins.
• Check for Short Circuits or Open Circuits:
• Use a multimeter to test for continuity in the wiring harness. Look for any short circuits or open circuits that could be causing communication issues.
• Verify Power and Ground:
• Check that the VCM is receiving the proper power and ground signals. Use a multimeter to measure voltage at the module’s power and ground pins.
• Inspect the VCM:
• If the wiring and connections are intact, the issue may lie within the VCM itself. Check for any signs of physical damage or water intrusion.
• If possible, perform a software update or reset the module to see if that resolves the issue.
• Check for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with the communication between modules.
• Test Communication:
• Use a scan tool to check the communication between the VCM and other modules. If other modules are not responding, it may indicate a broader communication issue.
• Perform a Hard Reset:
• Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U2674 code for your specific vehicle make and model. Manufacturers may have known fixes or updates for this issue.
• 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 vehicle’s specific systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2674 code.