WOMS
U code network Medium severity

U1383 U1383: "Module Communication Failure

The OBD2 code U1383 indicates a "Module Communication Failure," which means there is a problem with communication between the vehicle's control modules, potentially due to a wiring issue, a faulty module, or a network...

Definition

The OBD2 code U1383 indicates a "Module Communication Failure," which means there is a problem with communication between the vehicle's control modules, potentially due to a wiring issue, a faulty module, or a network problem

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning module
  • Corrupted software or firmware in the module
  • Poor ground connections
  • Intermittent electrical issues
  • Low battery voltage
  • Communication network issues (e.g., CAN bus problems)
  • Incompatible or aftermarket modules installed

Common misdiagnoses

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

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, loose connections, or broken wires. Pay special attention to ground connections

  3. 3. Verify Module Functionality

    Identify the specific module that is reporting the communication failure. Check if the module is functioning properly. This may involve testing the module with a scan tool or replacing it if necessary

  4. 4. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the affected modules

  5. 5. Inspect the CAN Bus

    The Controller Area Network (CAN) bus is responsible for communication between modules. Use a multimeter or oscilloscope to check for proper voltage levels and signal integrity on the CAN bus wires

  6. 6. Test the Battery and Charging System

    A weak battery or charging system can cause communication issues. Ensure that the battery is fully charged and that the charging system is functioning correctly

  7. 7. Clear Codes and Test Drive

    After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

  8. 8. Check for Intermittent Issues

    If the code is intermittent, monitor the vehicle for any specific conditions that trigger the code, such as temperature changes, vibrations, or specific driving conditions

  9. 9. Consult Technical Service Bulletins (TSBs)

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

  10. 10. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership with experience in diagnosing complex electrical and communication issues. By following these steps, you can systematically identify and resolve the underlying cause of the U1383 code