WOMS
U code network Medium severity

U0104 Lost Communication With Cruise Control Module

The OBD2 code U0104 indicates a lost communication with the cruise control module, meaning the vehicle's control system is unable to communicate with the cruise control module, potentially due to a wiring issue, a...

Definition

The OBD2 code U0104 indicates a lost communication with the cruise control module, meaning the vehicle's control system is unable to communicate with the cruise control module, potentially due to a wiring issue, a faulty module, or a problem with the vehicle's network

Common causes

  • Faulty cruise control module
  • Damaged wiring or connectors
  • Poor ground connection
  • Faulty engine control module (ECM)
  • Corroded or loose connectors
  • Software issues or glitches
  • Blown fuses
  • Intermittent electrical issues
  • Malfunctioning throttle position sensor
  • Issues with the vehicle's CAN bus system

Common misdiagnoses

  • Faulty cruise control switch
  • Malfunctioning brake light switch
  • Wiring issues or shorts in the harness
  • Defective engine control module (ECM)
  • Faulty throttle position sensor
  • Issues with the ABS module
  • Problems with the powertrain control module (PCM)
  • Incorrectly diagnosed transmission issues
  • Battery or charging system problems
  • Faulty speed sensor

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 cruise 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 or corroded

  4. 4. Check Power and Ground

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

  5. 5. Ground Connection

    Ensure that the ground connection for the cruise control module is secure and functioning properly

  6. 6. Inspect the Cruise Control Module

    If accessible, check the cruise control module for any visible damage or signs of failure

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

  8. 8. Check for Communication Issues

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

  9. 9. Scan Other Modules

    Use a scan tool to check if other modules in the vehicle are communicating correctly. If other modules are also having communication issues, it may indicate a problem with the CAN bus

  10. 10. Inspect Fuses

    Check the fuses related to the cruise control system and the powertrain control module (PCM). Replace any blown fuses

  11. 11. 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

  12. 12. Software Updates

    Check if there are any software updates available for the vehicle’s PCM or cruise control module. Sometimes, manufacturers release updates to fix known issues

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the cruise control system for your specific vehicle make and model. Manufacturers may have documented solutions for known issues

  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 diagnostic tools and experience with your specific vehicle.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the U0104 code. Always ensure safety and proper procedures when working on vehicle electronics