WOMS
U code network High severity

U0198 Lost Communication With Telematic Control Module

The OBD2 code U0198 indicates a loss of communication with the Telematic Control Module, which may affect features like navigation, emergency services, and vehicle tracking

Definition

The OBD2 code U0198 indicates a loss of communication with the Telematic Control Module, which may affect features like navigation, emergency services, and vehicle tracking

Common causes

  • Faulty Telematic Control Module (TCM)
  • Wiring issues or damaged connectors
  • Corroded or loose connections
  • Faulty or damaged CAN bus
  • Software issues or programming errors
  • Power supply problems to the TCM
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty Telematic Control Module (TCM)
  • Wiring issues or damaged connectors
  • Faulty Body Control Module (BCM)
  • Issues with the vehicle's battery or power supply
  • Software or firmware issues
  • Faulty GPS or antenna components
  • Communication issues with other control modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or indicate related issues

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the telematics control module (TCM) 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. Check Power and Ground

    Power Supply: Verify that the telematics control module is receiving the correct voltage. Use a multimeter to check the power supply at the module

  5. 5. Ground Connection

    Ensure that the ground connection for the TCM is secure and functioning properly

  6. 6. Inspect the Telematic Control Module

    Physical Condition: Check the TCM for any signs of physical damage or water intrusion

  7. 7. Re-seat the Module

    If possible, disconnect and reconnect the TCM to ensure a good connection

  8. 8. Check for Communication Issues

    CAN Bus Communication: Since the TCM communicates over the CAN bus, check for issues with the CAN network. Use a scan tool to monitor the CAN bus for any irregularities

  9. 9. Other Modules

    Verify that other modules in the vehicle are communicating properly. If other modules are also having communication issues, it may indicate a broader network problem

  10. 10. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the vehicle's electronic systems. Reconnect the battery and see if the code reappears

  11. 11. Update Software/Firmware

    Check if there are any software updates available for the telematics control module or the vehicle's ECU. Sometimes, manufacturers release updates to fix communication issues

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U0198 code or telematics control module issues for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations

  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 tools and knowledge to diagnose complex communication issues

  14. 14. Replace the Telematic Control Module

    If all else fails and the TCM is determined to be faulty, replacement may be necessary. Ensure that the replacement module is compatible with your vehicle. By following these steps, you should be able to identify the cause of the U0198 code and take appropriate action to resolve the issue