WOMS
U code network Medium severity

U1757 U1757: "Module Communication Failure

The OBD2 code U1757 indicates a "Module Communication Failure," meaning there is a problem with communication between vehicle control modules, often due to a wiring issue, a faulty module, or a network problem

Definition

The OBD2 code U1757 indicates a "Module Communication Failure," meaning there is a problem with communication between vehicle control modules, often due to a wiring issue, a faulty module, or a network problem

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning module
  • Poor ground connections
  • Corroded or damaged pins
  • Communication network issues (CAN bus problems)
  • Software or firmware issues
  • Intermittent electrical connections
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Software issues or updates needed
  • Battery or power supply problems
  • Grounding issues
  • Intermittent communication issues
  • Other communication protocol failures

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 lead to the root cause of the communication failure

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harnesses and connectors associated with the affected modules for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    Repair any damaged wires or connectors and ensure that all connections are secure

  4. 4. Check Power and Ground

    Power Supply: Verify that the affected module(s) are receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connections

    Ensure that the ground connections for the module are clean and secure

  6. 6. Test the Affected Module

    If you can identify which module is having communication issues, you may need to test or replace that module. This can often be done using specialized diagnostic tools

  7. 7. Check for Short Circuits

    Inspect the wiring for any short circuits that may be causing communication issues. This can include checking for pinched wires or damaged insulation

  8. 8. Look for Intermittent Issues

    Sometimes, communication failures can be intermittent. Pay attention to when the code appears (e.g., during specific driving conditions) and check for any patterns

  9. 9. Update Software/Firmware

    Check if there are any software or firmware updates available for the vehicle's modules. Sometimes, manufacturers release updates to fix communication issues

  10. 10. Perform a Network Scan

    Use a professional-grade scan tool to perform a network scan of all modules. This can help identify which module is not communicating properly

  11. 11. Check for Environmental Factors

    Ensure that there are no environmental factors affecting the modules, such as moisture or extreme temperatures

  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 communication issues.1

  13. 13. Reset the System

    After performing repairs, clear the codes and see if the issue reoccurs. Sometimes, a simple reset can resolve temporary communication issues.1

  14. 14. Seek Professional Help

    If the problem persists after performing these steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. By following these steps, you can systematically identify and resolve the underlying issues causing the U1757 code