WOMS
U code network Medium severity

U0156 Lost Communication With Information Center "A

The OBD2 code U0156 indicates a loss of communication between the vehicle's control module and the Information Center "A," which may affect features like the dashboard display or infotainment system

Definition

The OBD2 code U0156 indicates a loss of communication between the vehicle's control module and the Information Center "A," which may affect features like the dashboard display or infotainment system

Common causes

  • Faulty wiring or connectors
  • Malfunctioning Information Center module
  • Failed or corroded connectors
  • Software issues or bugs
  • Low battery voltage
  • Blown fuses
  • Interference from aftermarket devices
  • Poor ground connections

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Defective Instrument Cluster
  • Wiring issues or shorts
  • Faulty CAN bus communication
  • Malfunctioning Gateway Module
  • Power supply issues to modules
  • Software or firmware glitches
  • Faulty sensors or actuators related to the information center

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the information center and any related modules. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harnesses that connect to the information center

  4. 4. Check for Short Circuits or Open Circuits

    Use a multimeter to check for continuity in the wiring. Look for any short circuits or open circuits that could be causing communication issues

  5. 5. Inspect the Information Center Module

    If accessible, check the information center module for any signs of physical damage or water intrusion

  6. 6. Ensure that the module is securely mounted and that all connectors are properly seated

  7. 7. Test the Communication Bus

    Use a scan tool to monitor the communication bus (CAN bus) for proper operation. Check for any irregularities in data transmission

  8. 8. If you have access to a professional-grade scan tool, you can perform a network test to see if other modules are communicating properly

  9. 9. Check Power and Ground

    Verify that the information center module is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity

  10. 10. Reset the Codes

    Clear the trouble codes using the OBD-II scanner and see if the code returns after a short drive. If it does, further investigation is needed

  11. 11. Update or Reprogram Modules

    In some cases, a software update or reprogramming of the information center module may be necessary. Check with the manufacturer for any available updates

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U0156 code for your specific vehicle make and model. Manufacturers may have issued guidance for known issues

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. They may have specialized tools and knowledge to address complex communication issues. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U0156 code