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U2159 Lost Communication with Instrument Cluster

The OBD2 code U2159 indicates a loss of communication between the vehicle's control modules and the instrument cluster, which may result in the cluster not displaying information correctly

Definition

The OBD2 code U2159 indicates a loss of communication between the vehicle's control modules and the instrument cluster, which may result in the cluster not displaying information correctly

Common causes

  • Faulty instrument cluster
  • Damaged wiring or connectors
  • Poor ground connection
  • Failed communication network (CAN bus)
  • Malfunctioning body control module (BCM)
  • Software issues or programming errors
  • Corroded terminals or connectors
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty Instrument Cluster
  • Bad Wiring or Connectors
  • Faulty Body Control Module (BCM)
  • Faulty Engine Control Module (ECM)
  • Power Supply Issues
  • Faulty CAN Bus Communication
  • Faulty Sensors or Modules in the Network

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 for any visible damage to the instrument cluster, such as cracks or burnt components

  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 Fuses

    Inspect the fuses related to the instrument cluster and the communication network. Replace any blown fuses

  5. 5. Examine Wiring and Connectors

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

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

  7. 7. Test the Instrument Cluster

    If possible, test the instrument cluster by connecting a known good unit to see if the problem persists. This can help determine if the cluster itself is faulty

  8. 8. Check Communication Lines

    Use a multimeter or an oscilloscope to check for proper voltage and signal on the communication lines (CAN bus, LIN bus, etc.) that connect the instrument cluster to the vehicle’s network

  9. 9. Look for any interruptions or shorts in the communication lines

  10. 10. Inspect Other Modules

    Since the instrument cluster communicates with other modules (like the ECM, BCM, etc.), check these modules for faults or communication issues

  11. 11. Ensure that all modules are functioning correctly and that there are no communication errors

  12. 12. Battery and Ground Connections

    Check the vehicle’s battery voltage and ensure it is within the normal range

  13. 13. Inspect ground connections for the instrument cluster and other related modules to ensure they are clean and secure

  14. 14. Software Updates

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

  15. 15. Clear Codes and Test Drive

    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.1

  16. 16. Consult a Professional

    If the issue persists after all troubleshooting steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment. By following these steps, you should be able to identify the root cause of the U2159 code and take appropriate action to resolve the communication issue with the instrument cluster