U2471 – Control Module Communication Failure

The ODBII code U2471 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are unable to exchange data properly.

The severity of ODBII code U2471 is moderate.

Common Causes For: U2469 U2469: BECM Communication Failure

• Faulty control module
• Poor or damaged wiring/connectors
• Corroded terminals
• Software issues or bugs
• Communication network issues (CAN bus problems)
• Low battery voltage
• Intermittent electrical connections
• Faulty sensors or actuators
• Grounding issues
• Aftermarket modifications or installations

Common misdiagnosis for U2471 U2471: “Control Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2471 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 to ensure they are functioning correctly. This may involve using specialized diagnostic tools or software.
• If a module is found to be faulty, it may need to be repaired or replaced.
• Inspect the CAN Bus: The communication between control modules often occurs over a Controller Area Network (CAN) bus. Check for issues with the CAN bus wiring, such as shorts or opens.
• Use a CAN bus diagnostic tool to monitor the communication and check for errors.
• Reset the Codes: After performing inspections and repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Check for Software Updates: Sometimes, control modules may require software updates to resolve communication issues. Check with the manufacturer or a dealership for any available updates.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on known issues that could be relevant.
• 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.Conclusion Troubleshooting a U2471 code can be complex due to the nature of control module communication. Following these steps systematically can help identify and resolve the underlying issue. Always refer to the vehicle’s service manual for specific procedures and specifications.