WOMS
U code network High severity

U015B Lost Communication with Instrument Cluster (IC) Control Module

The OBD2 code U015B indicates a loss of communication with the Instrument Cluster (IC) Control Module, meaning the vehicle's computer is unable to receive data from the instrument cluster

Definition

The OBD2 code U015B indicates a loss of communication with the Instrument Cluster (IC) Control Module, meaning the vehicle's computer is unable to receive data from the instrument cluster

Common causes

  • Faulty Instrument Cluster Control Module
  • Damaged wiring or connectors
  • Poor ground connections
  • Faulty CAN bus communication
  • Malfunctioning Body Control Module (BCM)
  • Software issues or programming errors
  • Low battery voltage or power supply issues
  • Corrosion or dirt in connectors

Common misdiagnoses

  • Faulty Instrument Cluster
  • Bad Wiring or Connectors
  • Defective Body Control Module (BCM)
  • Malfunctioning Powertrain Control Module (PCM)
  • Battery or Charging System Issues
  • Faulty CAN Bus Communication
  • Grounding Issues
  • Software or Firmware Problems

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 the Instrument Cluster

    Visual Inspection: Check the instrument cluster for any visible damage or signs of water intrusion

  3. 3. Connections

    Ensure that the connectors and wiring harnesses to the instrument cluster are secure and free from corrosion or damage

  4. 4. Check Power and Ground

    Verify that the instrument cluster is receiving the proper power supply. Use a multimeter to check voltage at the cluster connector

  5. 5. Check the ground connections to the instrument cluster to ensure they are secure and have good continuity

  6. 6. Inspect Wiring and Connectors

    Look for damaged, frayed, or shorted wires in the harness leading to the instrument cluster

  7. 7. Ensure that all connectors are properly seated and that there are no bent pins

  8. 8. Test the Instrument Cluster

    If possible, perform a self-test of the instrument cluster (some vehicles have this feature). This can help determine if the cluster is functioning correctly

  9. 9. If you have access to a known good instrument cluster, consider swapping it temporarily to see if the issue persists

  10. 10. Check for Communication Issues

    Use a scan tool to monitor communication between the instrument cluster and other modules (like the PCM, BCM, etc.). Look for any communication errors

  11. 11. Inspect the CAN bus wiring for shorts, opens, or interference

  12. 12. Inspect Other Modules

    Since the instrument cluster communicates with other modules, check for issues in those modules (e.g., Body Control Module, Engine Control Module) that could affect communication

  13. 13. Update Software/Firmware

    Check if there are any software updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with a software update

  14. 14. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  15. 15. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U015B code for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations.1

  16. 16. Professional Diagnosis

    If the issue persists after all troubleshooting steps, consider seeking help from a professional mechanic or dealership, as they may have specialized tools and knowledge for your specific vehicle. By following these steps, you should be able to identify the root cause of the U015B code and take appropriate action to resolve the communication issue with the instrument cluster