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U code network High severity

U1355 Manufacturer Specific" code, which typically indicates a communication issue between modules in the vehicle's network

The OBD2 code U1355 indicates a communication issue between modules in the vehicle's network, often related to a failure in data transmission or a malfunction in one of the control modules

Definition

The OBD2 code U1355 indicates a communication issue between modules in the vehicle's network, often related to a failure in data transmission or a malfunction in one of the control modules

Common causes

  • Faulty wiring or connectors
  • Malfunctioning control module
  • Corroded or damaged pins
  • Poor ground connections
  • Intermittent electrical issues
  • Software glitches or outdated firmware
  • Faulty CAN bus communication
  • Battery voltage issues
  • Aftermarket modifications or installations
  • Environmental factors (moisture, temperature) affecting connections

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Software issues or outdated firmware
  • Battery or power supply problems
  • Grounding issues
  • Intermittent faults in communication lines
  • Incorrectly installed aftermarket accessories
  • Corrupted data or configuration settings
  • Faulty sensors or actuators
  • Other unrelated DTCs leading to confusion

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Addressing other codes may resolve the U1355 issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harnesses and connectors related to 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 all connections are secure

  4. 4. Check Module Communication

    Network Scan: Use a scan tool to check if all modules are communicating properly. Some scan tools can perform a network test to identify which module is not responding

  5. 5. Module Functionality

    If a specific module is not communicating, it may be faulty and require replacement

  6. 6. Inspect Ground Connections

    Ensure that all ground connections for the affected modules are clean and secure. Poor ground connections can lead to communication issues

  7. 7. Check Power Supply

    Verify that the affected modules are receiving the correct voltage. Use a multimeter to check the power supply to the modules

  8. 8. Reset the Codes

    After performing any repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Update Software/Firmware

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

  10. 10. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the modules. Reconnect and check if the code reappears

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U1355 code for your specific vehicle make and model. Manufacturers may have documented solutions for known issues

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues.Additional Tips: - Always refer to the vehicle’s service manual for specific diagnostic procedures and wiring diagrams. - Be cautious when working with electrical systems to avoid causing further damage. By following these troubleshooting steps, you can systematically identify and resolve the communication issue indicated by the U1355 code