WOMS
U code network High severity

U2115 Lost Communication with Vehicle Control Module

The OBD2 code U2115 indicates a loss of communication with the vehicle control module, suggesting that the module is not responding or is unable to communicate with other systems in the vehicle

Definition

The OBD2 code U2115 indicates a loss of communication with the vehicle control module, suggesting that the module is not responding or is unable to communicate with other systems in the vehicle

Common causes

  • Faulty Vehicle Control Module (VCM)
  • Damaged wiring or connectors
  • Poor ground connections
  • Corroded terminals
  • Faulty communication network (CAN bus issues)
  • Malfunctioning sensors or actuators
  • Software or firmware issues
  • Battery or power supply problems

Common misdiagnoses

  • Faulty Vehicle Control Module (VCM)
  • Wiring issues or damaged connectors
  • Faulty or corroded ground connections
  • Malfunctioning sensors
  • Issues with the powertrain control module (PCM)
  • Problems with the body control module (BCM)
  • Faulty communication lines (CAN bus issues)
  • Battery or charging system problems
  • Software or firmware issues in the control modules
  • Intermittent electrical faults

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the Vehicle Control Module (VCM) 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 VCM is receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connections

    Ensure that the ground connections are secure and free of corrosion

  6. 6. Inspect the Vehicle Control Module

    Module Condition: Check the VCM for any signs of physical damage or water intrusion

  7. 7. Reprogramming

    If applicable, consider reprogramming or updating the software of the VCM, as a software glitch can sometimes cause communication issues

  8. 8. Test Communication Lines

    CAN Bus Testing: If the vehicle uses a Controller Area Network (CAN) bus, use a scan tool to check for communication on the bus. You can also use an oscilloscope to monitor the signals

  9. 9. Loopback Test

    Perform a loopback test to ensure that the communication lines are functioning correctly

  10. 10. Check for Interference

    Aftermarket Accessories: If any aftermarket accessories have been installed, they may interfere with the communication. Temporarily disconnect them to see if the issue resolves

  11. 11. Clear Codes and Test Drive

    After performing the above checks, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears

  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 the U2115 code

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment.Conclusion Troubleshooting the U2115 code involves a systematic approach to check for communication issues between the VCM and other modules. By following these steps, you can identify the root cause of the problem and take appropriate action to resolve it