WOMS
U code network Medium severity

U2979 Lost Communication with the Steering Angle Sensor

The OBD2 code U2979 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 U2979 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 updates needed
  • Corrosion or dirt in connectors
  • Power supply issues to the sensor
  • Faulty CAN bus communication

Common misdiagnoses

  • Faulty Steering Angle Sensor
  • Wiring Issues or Short Circuits
  • Faulty Clock Spring
  • Malfunctioning ABS Module
  • Power Steering Control Module Issues
  • Incorrectly Calibrated Steering Angle Sensor
  • Faulty Body Control Module (BCM)
  • Issues with the Vehicle's CAN Bus System

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue

  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 damaged

  4. 4. Test the Steering Angle Sensor

    Sensor Functionality: If possible, test the steering angle sensor using a multimeter or scan tool to ensure it is functioning correctly. Check for proper voltage and resistance values as specified by the manufacturer

  5. 5. Calibration

    Some vehicles require the steering angle sensor to be calibrated after installation or repair. Refer to the vehicle’s service manual for calibration procedures

  6. 6. Check Power and Ground

    Verify that the steering angle sensor is receiving the correct voltage and that the ground connection is solid. 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 (Controller Area Network) bus, check for any issues with the CAN wiring. Look for shorts, opens, or other faults in the wiring

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

  9. 9. 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

  10. 10. Clear Codes and Test Drive

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

  11. 11. Professional Diagnosis

    If you are unable to resolve the issue after these steps, it may be necessary to seek assistance from a professional mechanic or dealership, as they may have specialized tools and knowledge to diagnose complex issues. By following these steps, you should be able to identify and potentially resolve the issue related to the U2979 code