U2744 – Invalid Data Received from Vehicle Control Module.

The ODBII code U2744 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 U2744 is generally considered moderate.

Common Causes For: U2743 Vehicle Communication Bus Malfunction

• 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
• Electrical interference or noise
• Low battery voltage or power supply issues
• Grounding issues in the vehicle’s electrical system

Common misdiagnosis for U2744 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
• Incorrectly installed aftermarket accessories or modifications

Common Troubleshooting Steps

The OBD-II code U2744 indicates that there is an issue with the communication between the vehicle control module (VCM) and other modules in the vehicle. This code typically points to a problem with data transmission, which can be caused by various factors. 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: Examine the wiring and connectors associated with the VCM and other modules. Look for signs of damage, corrosion, loose connections, or frayed wires. Repair or replace any damaged components.
• Check for Ground Issues: Ensure that all ground connections are secure and free of corrosion. Poor grounding can lead to communication issues between modules.
• Inspect the VCM: If the VCM itself is suspected to be faulty, check for any visible damage or signs of water intrusion. If possible, test the VCM with a known good unit.
• Verify Module Communication: Use a scan tool to check if other modules in the vehicle are communicating properly. If other modules are also showing communication errors, the issue may be with the network itself.
• Check the CAN Bus: The Controller Area Network (CAN) bus is responsible for communication between modules. Inspect the CAN bus wiring for damage and ensure that the termination resistors are present and functioning correctly.
• Perform a Network Test: Some advanced scan tools can perform a network test to check for communication issues. This can help identify if a specific module is causing the problem.
• Update Software/Firmware: Check if there are any software or firmware updates available for the VCM or other modules. Sometimes, updating the software can resolve communication issues.
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U2744 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in troubleshooting. 1
• Seek Professional Help: 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 specific systems. By following these steps, you can systematically diagnose and address the underlying issues causing the U2744 code.