WOMS
U code network Medium severity

U0158 Lost Communication With Head Up Display

The OBD2 code U0158 indicates a loss of communication with the Head-Up Display (HUD) module in a vehicle, suggesting that the vehicle's computer is unable to receive data from or send data to the HUD

Definition

The OBD2 code U0158 indicates a loss of communication with the Head-Up Display (HUD) module in a vehicle, suggesting that the vehicle's computer is unable to receive data from or send data to the HUD

Common causes

  • Faulty Head-Up Display (HUD) module
  • Damaged wiring or connectors
  • Poor ground connection
  • Faulty communication network (CAN bus)
  • Software issues or bugs
  • Corroded or loose connectors
  • Power supply issues to the HUD module

Common misdiagnoses

  • Faulty Head-Up Display (HUD) unit
  • Wiring issues or damaged connectors
  • Faulty Instrument Cluster
  • Malfunctioning Body Control Module (BCM)
  • Software glitches or outdated firmware
  • Power supply issues to the HUD
  • Faulty CAN bus communication
  • Issues with the vehicle's main computer (ECU)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the Head Up Display (HUD) for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Check Power and Ground

    Verify that the HUD is receiving the correct voltage and ground. Use a multimeter to check for power at the HUD connector

  5. 5. Ensure that the ground connections are secure and free of corrosion

  6. 6. Inspect the Head Up Display Unit

    If possible, remove the HUD unit and inspect it for any physical damage or signs of malfunction

  7. 7. If you have access to a known good unit, consider swapping it to see if the problem persists

  8. 8. Check for Communication Issues

    Use a scan tool to check if the HUD is communicating with the vehicle’s network. If the HUD is not responding, it may indicate a fault in the unit itself or in the communication lines

  9. 9. Check the vehicle’s CAN (Controller Area Network) bus for any issues, as the HUD relies on this network for communication

  10. 10. Inspect Related Modules

    Check other modules that communicate with the HUD, such as the Instrument Cluster or Body Control Module (BCM). Ensure they are functioning correctly and do not have communication issues

  11. 11. Perform a Reset

    Clear the trouble codes using the OBD-II scanner and see if the code returns after a short drive. Sometimes, a reset can resolve temporary communication issues

  12. 12. Software Updates

    Check if there are any software updates available for the vehicle’s modules. Sometimes, manufacturers release updates to fix communication issues

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the HUD or communication issues for your specific vehicle make and model. Manufacturers may have documented common problems and solutions

  14. 14. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the U0158 code. Always ensure safety and proper procedures when working on vehicle electronics