U2519 – Control Module Communication Failure

The ODBII code U2519 indicates a “Control Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, which can affect various systems and functions.

The severity of ODBII code U2519 is generally considered moderate to severe.

Common Causes For: U2517 U2517: “Control Module Communication Failure”

• Faulty control module
• Poor electrical connections
• Damaged wiring harness
• Corroded connectors
• Software issues or bugs
• Low battery voltage
• Interference from aftermarket devices
• Faulty CAN bus communication
• Grounding issues
• Failed or malfunctioning sensors

Common misdiagnosis for U2519 U2519: “Control Module Communication Failure”

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Battery or power supply problems
• Intermittent connection issues
• Communication network faults (CAN bus issues)

Common Troubleshooting Steps

The OBD-II code U2519 indicates a “Control Module Communication Failure.” This code typically suggests that there is a problem with communication between various control modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional 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: Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the affected modules.
• Check Power and Ground: Ensure that the control modules have proper power and ground connections. Use a multimeter to check voltage and ground continuity.
• Verify that the fuses related to the control modules are intact.
• Test Control Modules: If possible, test the affected control modules individually. This may involve using specialized diagnostic tools or software to communicate with the modules.
• If a module is unresponsive, it may need to be replaced.
• Look for Intermittent Issues: Sometimes, communication failures can be intermittent. Check for any patterns or specific conditions under which the code appears (e.g., temperature, vehicle speed).
• Check for Software Updates: Verify if there are any software updates available for the vehicle’s control modules. Manufacturers may release updates to fix known communication issues.
• Perform a Network Test: Use a scan tool capable of performing a network test to check the communication between modules. This can help identify which module is not communicating properly.
• Inspect for Environmental Factors: Check for any environmental factors that could affect communication, such as moisture or extreme temperatures.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the codes and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented solutions for known issues.1
• Seek Professional Help: If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing control module communication issues. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2519 code.