WOMS
U code network High severity

U1075 Lost Communication with Vehicle Control Module

The OBD2 code U1075 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 or other modules in the vehicle

Definition

The OBD2 code U1075 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 or other modules in the vehicle

Common causes

  • Faulty Vehicle Control Module (VCM)
  • Damaged wiring or connectors
  • Poor ground connections
  • Faulty communication network (CAN bus issues)
  • Corroded or loose connectors
  • Malfunctioning power supply to the VCM
  • Software issues or programming errors
  • Intermittent electrical issues

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 Wiring and Connectors

    Visual Inspection: Check the wiring and connectors associated with the 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 proper power supply. Use a multimeter to check voltage at the module's power and ground pins

  5. 5. Ensure that the ground connections are secure and free of corrosion

  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-diagnostics

  7. 7. If you have access to a known good module, you can swap it out 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 any issues with the CAN bus wiring, such as shorts or opens

  9. 9. Use an oscilloscope or a CAN bus tester to monitor the communication signals on the bus

  10. 10. Check for Interference

    Look for any aftermarket devices or modifications that may interfere with the vehicle's communication network, such as alarms, remote starters, or stereo systems

  11. 11. Reset the Codes

    Clear the trouble codes using an OBD-II scanner and see if the U1075 code returns. If it does, further investigation is needed

  12. 12. Update Software/Firmware

    In some cases, a software update for the control module may be necessary. Check with the manufacturer for any available updates

  13. 13. 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 communication problems

  14. 14. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you can systematically identify and resolve the issue causing the U1075 code