U2522 – Control Module Communication Failure

The ODBII code U2522 indicates a “Control Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, which may affect their ability to share data and function properly.

The severity of ODBII code U2522 is moderate.

Common Causes For: U2521 U2521: “Control Module Communication Failure”

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Corroded terminals
• Software issues or bugs
• Intermittent electrical connections
• Faulty communication bus (CAN bus) issues
• Low battery voltage or power supply issues
• Aftermarket modifications or installations affecting communication
• Faulty sensors or actuators affecting communication pathways

Common misdiagnosis for U2522 U2522: “Control Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2522 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 specific module is unresponsive, it may need to be replaced.
• Inspect for Short Circuits: Check for any short circuits in the wiring that could be causing communication issues. This may involve testing continuity between wires that should not be connected.
• Check for Software Updates: Sometimes, control modules may require software updates to function correctly. Check with the manufacturer or a dealership for any available updates.
• Clear Codes and Test Drive: After performing any repairs or inspections, clear the trouble codes using the OBD-II scanner 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 specific make and model of the vehicle. Manufacturers may have issued bulletins regarding known issues and fixes.
• 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 the specific vehicle and its control systems.
• Consider Environmental Factors: Sometimes, environmental factors such as moisture or extreme temperatures can affect module communication. Ensure that the vehicle is in a suitable environment for testing. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U2522 code.