WOMS
U code network Medium severity

U0187 Lost Communication With Digital Disc Player/Changer Module "A

The OBD2 code U0187 indicates a loss of communication between the vehicle's control module and the digital disc player or changer module "A," suggesting a potential issue with the connection or the module itself

Definition

The OBD2 code U0187 indicates a loss of communication between the vehicle's control module and the digital disc player or changer module "A," suggesting a potential issue with the connection or the module itself

Common causes

  • Faulty digital disc player/changer module
  • Damaged wiring or connectors
  • Poor ground connection
  • Blown fuse
  • Faulty communication network (CAN bus issues)
  • Software or firmware issues
  • Corrosion or dirt in connectors
  • Disconnected or loose harness connections

Common misdiagnoses

  • Faulty wiring or connectors
  • Malfunctioning head unit
  • Defective digital disc player/changer
  • Software issues or updates needed
  • Battery or power supply problems
  • Grounding issues
  • Other communication network faults (e.g., CAN bus issues)

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors leading to the digital disc player/changer module 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. Test the Digital Disc Player/Changer Module

    If accessible, test the module itself for functionality. This may involve checking for power and ground at the module's connector

  5. 5. If possible, swap the module with a known good unit to see if the problem persists

  6. 6. Check for Power and Ground

    Use a multimeter to verify that the digital disc player/changer module is receiving the correct voltage and has a good ground connection

  7. 7. Inspect the CAN Bus Communication

    U0187 is often related to communication issues on the CAN bus. Check for any faults in the CAN bus wiring or other modules that may be affecting communication

  8. 8. Look for any signs of short circuits or open circuits in the CAN bus wiring

  9. 9. Check for Software Updates

    Sometimes, a software update for the vehicle’s ECU or the digital disc player/changer module can resolve communication issues. Check with the manufacturer for any available updates

  10. 10. Reset the System

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

  11. 11. Inspect Other Related Components

    If the vehicle has other audio or infotainment components, ensure they are functioning correctly, as issues with these systems can sometimes affect communication with the disc player/changer

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to U0187

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle model. By following these steps, you should be able to identify the root cause of the U0187 code and take appropriate action to resolve the issue