WOMS
U code network High severity

U018E U018E: "Lost Communication with Control Module

The OBD2 code U018E indicates that there is a loss of communication with a specific control module in the vehicle, which may affect the operation of various systems

Definition

The OBD2 code U018E indicates that there is a loss of communication with a specific control module in the vehicle, which may affect the operation of various systems

Common causes

  • Faulty wiring or connectors
  • Failed control module
  • Corroded connectors
  • Poor ground connection
  • Intermittent electrical issues
  • Software or firmware issues
  • Low battery voltage
  • Faulty communication network (CAN bus issues)

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Battery or power supply issues
  • Software glitches or updates needed
  • Faulty sensors
  • Grounding issues
  • Intermittent communication problems
  • Incorrectly installed aftermarket components

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 about the issue

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness 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 correct power supply and ground. Use a multimeter to check voltage and continuity

  5. 5. 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

  6. 6. Inspect for Communication Issues

    CAN Bus: If the vehicle uses a CAN (Controller Area Network) bus, check for issues in the bus wiring. Look for shorts, opens, or high resistance in the communication lines

  7. 7. Termination Resistors

    Ensure that the CAN bus has the correct termination resistors in place

  8. 8. Check for Software Updates

    Sometimes, control modules may require software updates. Check with the manufacturer or a dealership to see if there are any updates available for the control module

  9. 9. Reset the Codes

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

  10. 10. Inspect Related Modules

    If the control module in question is part of a network, check other related modules for communication issues. A problem in one module can affect communication with others

  11. 11. Consult Technical Service Bulletins (TSBs)

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

  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.Conclusion Troubleshooting a U018E code can be complex, as it often involves multiple systems and components. Following these steps systematically can help identify the root cause of the communication loss and lead to an effective resolution