WOMS
U code network High severity

U1059 Lost Communication with Vehicle Control Module

The OBD2 code U1059 indicates that there is a loss of communication with the vehicle control module, meaning the module is not responding or cannot be reached by the diagnostic tool

Definition

The OBD2 code U1059 indicates that there is a loss of communication with the vehicle control module, meaning the module is not responding or cannot be reached by the diagnostic tool

Common causes

  • Faulty Vehicle Control Module (VCM)
  • Damaged wiring or connectors
  • Poor ground connections
  • Corroded connectors
  • Faulty communication lines
  • Software issues or bugs
  • Battery or power supply problems
  • Intermittent electrical issues
  • Other module failures affecting communication

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective vehicle control module (VCM)
  • Malfunctioning engine control module (ECM)
  • Issues with the body control module (BCM)
  • Problems with the transmission control module (TCM)
  • Faulty sensors or actuators
  • Battery or charging system issues
  • Corrupted software or firmware in modules
  • Grounding issues
  • Intermittent electrical faults

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the affected 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. Check Power and Ground

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

  5. 5. Check the vehicle’s fuses related to the control module to ensure they are not blown

  6. 6. Test the Control Module

    If possible, test the control module itself. This may involve using a scan tool to see if the module responds to commands or performs self-tests

  7. 7. If you have access to a known good module, you can swap it in to see if the problem persists

  8. 8. Inspect the CAN Bus

    The communication between modules often occurs over a Controller Area Network (CAN) bus. Check for issues in the CAN bus wiring, such as shorts or opens

  9. 9. Use an oscilloscope or a CAN bus diagnostic tool to monitor the bus for proper communication signals

  10. 10. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the manufacturer for any available updates for the control module

  11. 11. Clear Codes and Test Drive

    After performing any repairs or 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)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to U1059

  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 a U1059 code can involve a combination of visual inspections, electrical testing, and possibly module replacement. Always ensure safety precautions are taken when working on a vehicle's electrical system