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C1956 Steering Angle Sensor Circuit Failure

The OBD2 code C1956 indicates a failure in the steering angle sensor circuit, which may affect the vehicle's stability control and steering response

Definition

The OBD2 code C1956 indicates a failure in the steering angle sensor circuit, which may affect the vehicle's stability control and steering response

Common causes

  • Faulty steering angle sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Calibration issues
  • Software or firmware problems
  • Steering column misalignment
  • Mechanical obstruction or damage in the steering system

Common misdiagnoses

  • Faulty steering angle sensor
  • Wiring issues or shorts in the sensor circuit
  • Faulty power steering control module
  • Incorrect wheel alignment
  • Malfunctioning ABS module
  • Issues with the vehicle's stability control system
  • Faulty steering rack or column components
  • Calibration errors after steering component replacement

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 steering angle sensor

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring harness and connectors associated with the steering angle sensor. Look for signs of damage, corrosion, or loose connections

  3. 3. Ensure that the connectors are securely attached and that there are no bent pins

  4. 4. Test the Steering Angle Sensor

    If accessible, test the steering angle sensor using a multimeter. Check for proper voltage and resistance according to the manufacturer’s specifications

  5. 5. Some vehicles may allow you to monitor the sensor's output using a scan tool to see if it responds correctly when the steering wheel is turned

  6. 6. Check for Mechanical Issues

    Ensure that the steering column and associated components are not binding or obstructed. Mechanical issues can affect the sensor's readings

  7. 7. Inspect the steering rack and pinion for any signs of wear or damage

  8. 8. Calibration of the Steering Angle Sensor

    If the sensor is functioning correctly but still throwing the code, it may need to be calibrated. Refer to the vehicle’s service manual for the specific calibration procedure

  9. 9. Calibration may require a specialized scan tool or software

  10. 10. Inspect the Power Supply and Ground

    Check the power supply and ground connections to the steering angle sensor. Ensure that the sensor is receiving the correct voltage and that the ground is solid

  11. 11. Look for Software Updates

    Check if there are any software updates available for the vehicle’s ECU that may address known issues with the steering angle sensor

  12. 12. Replace the Steering Angle Sensor

    If all other checks are satisfactory and the code persists, the steering angle sensor itself may be faulty and require replacement

  13. 13. Clear the Codes and Test Drive

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

  14. 14. Consult a Professional

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Important Note: Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications, as they can vary significantly between different makes and models