WOMS
U code network Medium severity

U012D Lost Communication with the Steering Angle Sensor Module

The OBD2 code U012D indicates that there is a loss of communication between the vehicle's control module and the steering angle sensor module, which may affect the vehicle's stability control and steering functions

Definition

The OBD2 code U012D indicates that there is a loss of communication between the vehicle's control module and the steering angle sensor module, which may affect the vehicle's stability control and steering functions

Common causes

  • Faulty steering angle sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Failed steering angle sensor module
  • Issues with the vehicle's CAN bus
  • Software or calibration issues
  • Corrosion or dirt in connectors
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty Steering Angle Sensor
  • Wiring Issues or Short Circuits
  • Faulty Body Control Module (BCM)
  • Faulty Electronic Power Steering (EPS) Module
  • Incorrectly calibrated steering angle sensor
  • Faulty ABS Module
  • Issues with the CAN Bus communication system
  • Battery or Power Supply Problems

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 affecting the communication

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the steering angle sensor. Look for 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 to ensure it is functioning correctly. This may involve using a multimeter or an oscilloscope to check for proper output signals

  5. 5. Replacement

    If the sensor is faulty, consider replacing it

  6. 6. Check the CAN Bus System

    Communication Lines: Inspect the CAN bus wiring for any damage or shorts. The steering angle sensor communicates over the CAN bus, so issues here can lead to communication loss

  7. 7. Termination Resistors

    Ensure that the CAN bus termination resistors are present and functioning correctly

  8. 8. Inspect the Power and Ground Supply

    Power Supply: Verify that the steering angle sensor is receiving the correct voltage. Check the vehicle’s wiring diagrams for the correct voltage specifications

  9. 9. Ground Connections

    Ensure that the ground connections for the sensor are secure and free of corrosion

  10. 10. Check for Software Issues

    ECU Updates: Sometimes, the issue can be related to software. Check if there are any available updates for the vehicle’s ECU that may address communication issues

  11. 11. Reprogramming

    In some cases, reprogramming or resetting the ECU may resolve communication problems

  12. 12. Clear Codes and Test Drive

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

  13. 13. Take the vehicle for a test drive to see if the code returns. Monitor the steering angle sensor data to ensure it is functioning correctly

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the steering angle sensor or communication issues for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations

  15. 15. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U012D code