WOMS
U code network Medium severity

U1470 U1470: "Control Module Communication Error

The OBD2 code U1470 indicates a "Control Module Communication Error," meaning there is a problem with communication between the vehicle's control modules, which can affect various systems and functions

Definition

The OBD2 code U1470 indicates a "Control Module Communication Error," 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
  • 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 misdiagnoses

  • 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)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the communication error

  2. 2. Inspect Wiring and Connectors

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

  4. 4. Pay special attention to the wiring harnesses that connect the affected control modules

  5. 5. Check Power and Ground

  6. 6. Ensure that the control modules have proper power and ground connections. Use a multimeter to check for voltage at the module connectors

  7. 7. Verify that the ground connections are clean and secure

  8. 8. Test Control Modules

  9. 9. If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve swapping with a known good module or using specialized diagnostic equipment

  10. 10. Check for any software updates or reprogramming requirements for the control modules

  11. 11. Inspect the CAN Bus

  12. 12. The communication between control modules often occurs over a Controller Area Network (CAN) bus. Inspect the CAN bus wiring for damage or shorts

  13. 13. Use a CAN bus scanner to check for communication errors or issues on the bus

  14. 14. Check for Interference

  15. 15. Look for any aftermarket devices or modifications that may interfere with the vehicle's communication systems. This includes alarm systems, stereo installations, or other electronic devices

  16. 16. Clear Codes and Test Drive

  17. 17. After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  18. 18. Consult Technical Service Bulletins (TSBs)

  19. 19. Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to control module communication

  20. 20. Professional Diagnosis

  21. 21. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources. By following these steps, you can systematically diagnose and potentially resolve the U1470 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle