WOMS
U code network High severity

U0167 Lost Communication With Vehicle Immobilizer Control Module

The OBD2 code U0167 indicates a loss of communication with the vehicle's immobilizer control module, which may affect the vehicle's ability to start or operate properly

Definition

The OBD2 code U0167 indicates a loss of communication with the vehicle's immobilizer control module, which may affect the vehicle's ability to start or operate properly

Common causes

  • Faulty vehicle immobilizer control module
  • Damaged wiring or connectors
  • Poor ground connections
  • Faulty OBDII port
  • Malfunctioning key or key fob
  • Software issues or programming errors
  • Battery voltage issues
  • Corroded terminals or connectors
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad Wiring or Connectors
  • Defective Key or Key Fob
  • Malfunctioning Body Control Module (BCM)
  • Issues with the Anti-theft System
  • Battery or Power Supply Problems
  • Faulty Ignition Switch
  • Incorrectly Programmed Key or Module

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 and connectors related to the immobilizer control module. Look for 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 the Immobilizer Control Module

    Module Functionality: If possible, test the immobilizer control module to ensure it is functioning correctly. This may require specialized equipment or a professional diagnostic tool

  5. 5. Reprogramming

    In some cases, the module may need to be reprogrammed or reset

  6. 6. Inspect the Key/Transponder

    Key Condition: Check the condition of the key or transponder. If the key is damaged or the transponder is malfunctioning, it may not communicate properly with the immobilizer

  7. 7. Spare Key

    If available, try using a spare key to see if the issue persists

  8. 8. Check for Power and Ground

    Power Supply: Verify that the immobilizer control module is receiving the correct voltage and ground. Use a multimeter to check for power at the module's connector

  9. 9. Fuses

    Inspect relevant fuses related to the immobilizer system to ensure they are not blown

  10. 10. Scan for Communication Issues

    CAN Bus Communication: Since the immobilizer communicates over the CAN bus, check for any issues with the CAN bus system. Look for other modules that may not be communicating properly

  11. 11. Network Integrity

    Ensure that there are no shorts or open circuits in the CAN bus wiring

  12. 12. Check for Software Updates

    Manufacturer Updates: Check if there are any software updates available for the vehicle’s ECU or immobilizer module. Sometimes, manufacturers release updates to fix communication issues

  13. 13. Perform a Hard Reset

    Battery Disconnect: Disconnect the vehicle's battery for a few minutes to reset the system. Reconnect and see if the code reappears

  14. 14. Consult Technical Service Bulletins (TSBs)

    Manufacturer TSBs: Look for any TSBs related to the immobilizer system for your specific vehicle make and model. These can provide valuable insights into known issues and fixes

  15. 15. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership with experience in your vehicle's make and model. They may have access to specialized diagnostic tools and knowledge.Conclusion Troubleshooting the U0167 code involves a systematic approach to identify and resolve communication issues with the immobilizer control module. Always ensure safety precautions are taken when working with vehicle electronics, and consult a professional if you are unsure about any steps