U2799 – Invalid Data Received from Vehicle Control Module.

The ODBII code U2799 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 U2799 is generally considered moderate.

Common Causes For: U2797 U2797: Control Module Communication Bus Fault

• 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 grounding issues
• Low battery voltage or power supply problems

Common misdiagnosis for U2799 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or short circuits
• Corrupted software or firmware in the VCM
• Faulty sensors or actuators
• Communication issues with other modules
• Battery or power supply problems
• Grounding issues
• Incorrectly installed aftermarket components

Common Troubleshooting Steps

The OBD-II code U2799 indicates that there is an issue with the communication between the vehicle’s control modules, specifically that invalid data has been received from a vehicle control module. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other 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: Examine the wiring and connectors associated with the affected control module. Look for signs of damage, corrosion, or loose connections that could affect communication.
• Check Power and Ground: Ensure that the control module has proper power and ground connections. Use a multimeter to verify voltage and ground integrity.
• Clear Codes and Test Drive: Clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive. Sometimes, the code may be a temporary glitch that can be resolved by resetting the system.
• Inspect Control Module: If the problem persists, inspect the control module itself for any signs of damage or failure. This may include checking for water intrusion or physical damage.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix communication issues.
• Check for Interference: Ensure that there are no aftermarket devices or modifications that could interfere with the vehicle’s communication network.
• Perform a Network Scan: Use a professional-grade scan tool to perform a network scan of all control modules. This can help identify if other modules are experiencing communication issues.
• Consult Wiring Diagrams: Refer to the vehicle’s wiring diagrams to understand the communication pathways between modules. This can help identify potential issues in the communication network.
• Replace Faulty Components: If a specific control module is identified as faulty, consider replacing it. Ensure that the replacement module is compatible with the vehicle. 1
• Seek Professional Help: If the issue cannot be resolved with the above steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics and diagnostics. By following these steps, you can systematically diagnose and address the U2799 code and its underlying causes.