WOMS
U code network Medium severity

U2981 Lost Communication with the Steering Angle Sensor

The OBD2 code U2981 indicates a loss of communication with the steering angle sensor, which may affect the vehicle's stability control and steering systems

Definition

The OBD2 code U2981 indicates a loss of communication with the steering angle sensor, which may affect the vehicle's stability control and steering systems

Common causes

  • Faulty steering angle sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Malfunctioning vehicle control module
  • Software issues or bugs
  • Corrosion in connectors or terminals
  • Interference from other electronic components
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty steering angle sensor
  • Wiring issues or damaged connectors
  • Faulty steering column module
  • ABS module failure
  • Power steering system issues
  • Incorrectly calibrated steering angle sensor
  • Faulty body control module (BCM)
  • Software or firmware issues in the vehicle's control modules

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 issues present

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the steering angle sensor 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 Steering Angle Sensor

    Sensor Functionality: If possible, test the steering angle sensor using a multimeter or an oscilloscope to ensure it is functioning correctly

  5. 5. Resistance and Voltage

    Check the resistance and voltage output of the sensor according to the manufacturer’s specifications

  6. 6. Check Power and Ground

    Verify that the steering angle sensor is receiving the correct voltage and has a good ground connection. Use a multimeter to check for power at the sensor connector

  7. 7. Inspect the CAN Bus

    Since the steering angle sensor communicates over the CAN bus, check for any issues with the CAN network

  8. 8. Look for any damaged wiring or poor connections in the CAN bus system

  9. 9. Use a CAN bus scanner to check for communication errors

  10. 10. Clear Codes and Test Drive

    After performing inspections and repairs, clear the trouble codes using the OBD-II scanner

  11. 11. Take the vehicle for a test drive to see if the code reappears

  12. 12. Check for Software Updates

    Sometimes, manufacturers release software updates that can resolve communication issues. Check if there are any updates available for the vehicle’s ECU

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the steering angle sensor or communication issues for your specific vehicle make and model. These can provide valuable insights and solutions

  14. 14. Replace the Steering Angle Sensor

    If all other troubleshooting steps fail and the sensor is confirmed to be faulty, consider replacing the steering angle sensor

  15. 15. Professional Diagnosis

    If you are unable to resolve the issue, it may be best to consult a professional mechanic or technician who has experience with your vehicle’s make and model. By following these steps, you should be able to identify the cause of the U2981 code and take appropriate action to resolve the communication issue with the steering angle sensor