WOMS
U code network Medium severity

U0157 Lost Communication With Information Center "B

The OBD2 code U0157 indicates a lost communication with the Information Center "B," which typically refers to a failure in communication between the vehicle's control modules, specifically related to the infotainment or...

Definition

The OBD2 code U0157 indicates a lost communication with the Information Center "B," which typically refers to a failure in communication between the vehicle's control modules, specifically related to the infotainment or information display system

Common causes

  • Faulty wiring or connectors
  • Malfunctioning Information Center "B" module
  • Failed or damaged control module
  • Software issues or bugs
  • Corroded or loose connections
  • Power supply issues to the module
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective body control module (BCM)
  • Malfunctioning instrument cluster
  • Issues with the powertrain control module (PCM)
  • Problems with the communication network (CAN bus)
  • Low battery voltage or weak battery
  • Faulty sensors or actuators related to the information center
  • Software glitches or outdated firmware

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate 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 connectors for bent pins or poor contact

  4. 4. Check for Ground Issues

    Ensure that all ground connections related to the information center and other modules are secure and free of corrosion. A poor ground can lead to communication issues

  5. 5. Test the Modules

    If possible, test the information center and any related modules for proper operation. This may involve using specialized diagnostic tools or software

  6. 6. If you have access to a known good module, you can swap it in to see if the problem persists

  7. 7. Inspect the CAN Bus

    The communication between modules often occurs over the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens

  8. 8. Use a multimeter or oscilloscope to check for proper voltage levels and signal integrity on the CAN bus

  9. 9. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer or a dealership to see if there are any available updates for the modules involved

  10. 10. Reset the Codes

    After performing inspections and repairs, clear the codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  11. 11. 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 common issues related to U0157

  12. 12. Professional Diagnosis

    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.Conclusion Troubleshooting U0157 can be complex due to the nature of vehicle communication systems. Following these steps systematically can help identify and resolve the underlying issue. Always ensure safety and proper procedures when working on vehicle electronics