WOMS
U code network Medium severity

U0185 Lost Communication With Antenna Control Module

The OBD2 code U0185 indicates a loss of communication with the Antenna Control Module, which may affect functions related to the vehicle's antenna system, such as radio or navigation

Definition

The OBD2 code U0185 indicates a loss of communication with the Antenna Control Module, which may affect functions related to the vehicle's antenna system, such as radio or navigation

Common causes

  • Faulty antenna control module
  • Wiring issues (damaged, corroded, or loose connections)
  • Faulty connectors
  • Software glitches or programming issues
  • Power supply problems to the antenna control module
  • Interference from other electronic devices
  • Faulty vehicle communication network (CAN bus issues)

Common misdiagnoses

  • Faulty Antenna Control Module
  • Wiring issues or shorts in the communication circuit
  • Faulty Body Control Module (BCM)
  • Faulty Radio or Infotainment System
  • Poor ground connections
  • Software or firmware issues
  • Faulty connectors or terminals
  • Interference from aftermarket accessories

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 about the issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the antenna control module for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

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

  4. 4. Test the Antenna Control Module

    Power and Ground: Verify that the antenna control module is receiving the correct power and ground signals. Use a multimeter to check voltage and continuity

  5. 5. Module Functionality

    If possible, test the antenna control module in another vehicle or replace it with a known good unit to see if the problem persists

  6. 6. Check for Communication Issues

    CAN Bus Communication: Since the antenna control module communicates over the CAN bus, check for any issues with the CAN network. Look for other modules that may be having communication problems

  7. 7. Scan Tool

    Use a professional scan tool to monitor live data and see if the antenna control module responds to commands

  8. 8. Inspect Related Components

    Check other components that may be related to the antenna control module, such as the radio, GPS, or any other modules that may share communication lines

  9. 9. Look for Environmental Factors

    Sometimes, environmental factors such as water intrusion or extreme temperatures can affect module performance. Inspect for any signs of moisture or damage

  10. 10. Reset the System

    After performing checks and repairs, clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive

  11. 11. 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 the antenna control module

  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 specialized diagnostic tools and resources.Conclusion By following these troubleshooting steps, you can systematically identify and resolve the issue related to the U0185 code. Always ensure safety and proper procedures when working on vehicle electronics