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U code network High severity

U1350 Module Communication Failure

The OBD2 code U1350 indicates a communication failure between vehicle modules, suggesting that one or more modules are not properly communicating with the vehicle's network

Definition

The OBD2 code U1350 indicates a communication failure between vehicle modules, suggesting that one or more modules are not properly communicating with the vehicle's network

Common causes

  • Faulty wiring or connectors
  • Failed control module
  • Corroded or damaged pins
  • Poor ground connections
  • Intermittent electrical issues
  • Software or firmware issues
  • Communication network problems (e.g., CAN bus issues)
  • 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 module failures (e.g., ABS, BCM)
  • Incorrectly installed aftermarket accessories

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 indicate a related issue

  2. 2. Inspect the Wiring and Connectors

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

  3. 3. Repair or Replace

    If you find any damaged wires or connectors, repair or replace them as necessary

  4. 4. Check Power and Ground

    Power Supply: Ensure that the module in question is receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connection

    Verify that the ground connection for the module is secure and free of corrosion

  6. 6. Inspect the Module

    Physical Condition: Check the module for any signs of physical damage or water intrusion

  7. 7. Re-seat the Module

    If applicable, disconnect and reconnect the module to ensure a good connection

  8. 8. Check for Communication Issues

    CAN Bus Integrity: If the vehicle uses a CAN (Controller Area Network) bus, check the integrity of the bus. Look for short circuits, open circuits, or other communication issues

  9. 9. Scan Other Modules

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

  10. 10. Perform a Module Reset

    Clear Codes: Clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive

  11. 11. Battery Disconnect

    In some cases, disconnecting the battery for a few minutes can reset the modules and clear temporary communication issues

  12. 12. Update Software/Firmware

    Check for Updates: Some vehicles may require software updates for the modules. Check with the manufacturer or a dealership to see if there are any updates available

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to U1350 for your specific make and model. Manufacturers may have documented common issues and fixes

  14. 14. 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

  15. 15. Replace the Module (if necessary)

    If all else fails and the module is determined to be faulty, replacement may be necessary. Ensure that the replacement module is compatible with your vehicle. By following these steps, you can systematically troubleshoot and potentially resolve the U1350 code. Always refer to your vehicle's service manual for specific procedures and specifications