U1471: U1471: "Control Module Communication Failure

Definition

The OBD2 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

Common causes

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 misdiagnoses

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)

Troubleshooting steps

1. 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
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections
4. Pay special attention to the wiring harnesses that connect the affected control module to the rest of the vehicle
5. Check Power and Ground
6. 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
7. If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts
8. Test the Control Module
9. 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
10. Inspect the CAN Bus
11. 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
12. Use a CAN bus scanner to monitor the communication and check for any abnormalities
13. Check for Software Updates
14. 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
15. Clear Codes and Test Drive
16. 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
17. Refer to the vehicle's service manual for specific diagnostic procedures related to the U1471 code and the control modules involved
18. Seek Professional Help
19. 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

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections

4. Pay special attention to the wiring harnesses that connect the affected control module to the rest of the vehicle

5. Check Power and Ground

6. 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

7. If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts

8. Test the Control Module

9. 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

10. Inspect the CAN Bus

11. 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

12. Use a CAN bus scanner to monitor the communication and check for any abnormalities

13. Check for Software Updates

14. 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

15. Clear Codes and Test Drive

16. 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

17. Refer to the vehicle's service manual for specific diagnostic procedures related to the U1471 code and the control modules involved

18. Seek Professional Help