WOMS
U code network Medium severity

U020E Lost Communication with Seat Module

The OBD2 code U020E indicates a loss of communication with the seat module, meaning the vehicle's control system is unable to communicate with the seat's electronic control unit

Definition

The OBD2 code U020E indicates a loss of communication with the seat module, meaning the vehicle's control system is unable to communicate with the seat's electronic control unit

Common causes

  • Faulty seat module
  • Damaged wiring or connectors
  • Corroded connectors
  • Poor ground connection
  • Faulty communication network (CAN bus issues)
  • Blown fuse
  • Software or firmware issues in the seat module
  • Intermittent electrical connection

Common misdiagnoses

  • Faulty seat module
  • Wiring issues or shorts
  • Faulty body control module (BCM)
  • Corrupted software in the seat module
  • Issues with the CAN bus system
  • Battery or power supply problems
  • Faulty connectors or terminals
  • Other communication module failures

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other modules affected

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors leading to the seat 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 pushed back

  4. 4. Test the Seat Module

    If accessible, test the seat module for proper operation. This may involve checking for power and ground at the module

  5. 5. If possible, swap the seat module with a known good unit to see if the problem persists

  6. 6. Check for Power and Ground

    Use a multimeter to verify that the seat module is receiving the correct voltage and ground. Refer to the vehicle’s wiring diagram for the specific pin locations and expected voltages

  7. 7. Inspect the CAN Bus

    Since many vehicle systems communicate over the Controller Area Network (CAN) bus, check for issues with the CAN bus wiring. Look for shorts, opens, or interference

  8. 8. Use a scan tool to monitor the CAN bus for communication errors

  9. 9. 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 seat module or the vehicle’s control modules

  10. 10. Clear Codes and Test Drive

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

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the seat module or communication issues for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations

  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 diagnostic tools and experience with your vehicle.Conclusion Troubleshooting a U020E code involves a systematic approach to check for communication issues, inspect wiring and connectors, and verify module functionality. Following these steps can help identify the root cause of the problem and lead to an effective resolution