U1471 – Control Module Communication Failure

The ODBII code U1471 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.

Moderate to severe.

Common Causes For: U1470 U1470: “Control Module Communication Error”

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Corroded terminals
• Software issues or bugs
• Communication network failure (CAN bus issues)
• Intermittent electrical connections
• Low battery voltage or power supply issues

Common misdiagnosis for U1471 U1471: “Control Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U1471 indicates a “Control Module Communication Failure.” This code typically suggests that there is a problem with communication between the vehicle’s control modules. 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 control module to the rest of the vehicle.
• Check Power and Ground:
• Ensure that the control module has the proper power supply and ground. Use a multimeter to check for voltage at the module’s power and ground pins.
• If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts.
• Test the Control Module:
• If the wiring and connections are intact, the control module itself may be faulty. If possible, test the module in another vehicle or replace it with a known good module to see if the issue persists.
• Inspect the CAN Bus:
• The communication between control modules often occurs over a Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use a CAN bus scanner to monitor the communication and check for any abnormalities.
• Check for Software Updates:
• Sometimes, a software update from the manufacturer can resolve communication issues. Check if there are any available updates for the control modules in your vehicle.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the U1471 code and the control modules involved.
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U1471 code.