Diagnosing & Fixing C0071 Steering Angle Sensor Malfunction in a Subaru BRZ (2013-2020)

Introduction

Imagine you're driving your Subaru BRZ (2013-2020), and suddenly, the traction control light appears on the dashboard. You notice the steering feels slightly off, and cornering isn't as precise as it used to be. A quick scan using an OBD-II scanner reveals the fault code C0071 - Steering Angle Sensor Malfunction. What does this mean, and how do you fix it?

At AUTOTEK, we specialize in real-world diagnostics and expert vehicle troubleshooting. In this guide, we’ll explain why your Subaru BRZ's steering angle sensor may be failing, how to diagnose the issue, and the best way to fix it.

Understanding C0071 – Steering Angle Sensor Malfunction

The steering angle sensor (SAS) is a critical component of your vehicle's stability control system. It monitors the position of the steering wheel and sends data to the ECU to adjust traction control and electronic stability programs accordingly.

If the SAS malfunctions, it can cause traction and stability issues, erratic steering behavior, and even disable certain safety features. This can be due to a faulty sensor, wiring issues, or improper calibration.

Common Symptoms of a Faulty Steering Angle Sensor in a Subaru BRZ:

• Traction Control or ABS warning lights on the dashboard
• Steering feels off-centered even when driving straight
• Vehicle stability control (VSC) not functioning properly
• Difficulty in cornering or delayed steering response
• Power steering assist may feel inconsistent

Related Fault Codes for Steering Angle Sensor Issues

A failing steering angle sensor or its circuitry can trigger multiple fault codes, including:

C1231 - Steering Angle Sensor Circuit Fault

• This code signifies a malfunction in the steering angle sensor circuit, potentially caused by a defective sensor, damaged wiring, or a need for recalibration.

U0126 - Lost Communication with Steering Angle Sensor Module

• This code indicates a loss of communication between the vehicle’s control module and the steering angle sensor. It could be due to a wiring issue, faulty sensor, or problems within the Controller Area Network (CAN) bus.

If any of these codes appear, your steering angle sensor may need recalibration or replacement.

Step-by-Step Diagnosis of C0071 in a Subaru BRZ

Before replacing the sensor, follow these diagnostic steps:

Step 1: Scan for Fault Codes

• Use an OBD-II scanner to confirm C0071 or related steering system codes.
• If additional codes like C1231 or U0126 appear, it may indicate a wiring or communication issue.

Step 2: Inspect the Steering Angle Sensor & Wiring

• Locate the steering angle sensor, usually inside the steering column assembly.
• Check for loose connections, corroded terminals, or damaged wiring.

Step 3: Check Steering Sensor Readings

• Use a diagnostic scan tool to check steering angle sensor live data.
• Rotate the steering wheel and observe if the sensor angle readings change correctly.
• If the values do not update smoothly or are stuck, the sensor may be faulty.

Step 4: Perform Steering Angle Sensor Recalibration

• In some cases, the issue may be improper calibration rather than a faulty sensor.
• Use a diagnostic tool to reset and recalibrate the steering angle sensor.
• Test drive the car to see if the issue is resolved.

Step 5: Reset the Fault Code & Test Drive

• Clear the C0071 code using an OBD-II scanner.
• Drive the vehicle in a straight line for a few minutes to allow the ECU to recalibrate.
• If the code reappears, the sensor likely needs replacement.

Recommended Fix for Subaru BRZ C0071 Code

If diagnosing the system confirms a faulty steering angle sensor, the best solution is to replace it.

✅ Recommended Replacement Part: Steering Angle Sensor - Subaru BRZ (2013-2020) - 27549CA001

Replacement Procedure:

1. Disconnect the battery to prevent electrical shorts.
2. Remove the steering wheel cover and locate the steering angle sensor.
3. Disconnect the sensor wiring and carefully remove the faulty sensor.
4. Install the new steering angle sensor, ensuring proper alignment.
5. Reconnect the wiring and secure all components.
6. Recalibrate the new sensor using a diagnostic scan tool.
7. Clear any stored fault codes and perform a test drive.

Similar Fault Codes & Reference

If your vehicle displays additional steering system-related codes, here’s how they compare:

• C1231 – Steering Angle Sensor Circuit Fault
• U0126 – Lost Communication with Steering Angle Sensor Module
• C1431 – Incorrect Steering Angle Sensor Output
• C1953 – Steering Angle Sensor Misalignment

These codes all indicate issues with the steering angle sensor or its communication with the vehicle’s ECU, requiring sensor recalibration or replacement.

Conclusion

The C0071 fault code in a Subaru BRZ (2013-2020) is typically caused by a failing steering angle sensor or incorrect calibration, leading to traction control issues, poor steering response, and dashboard warning lights. Replacing the faulty steering angle sensor can restore proper vehicle stability and steering precision.

If you’re experiencing this issue, consider replacing the steering angle sensor, available on AUTOTEK. Need expert guidance? Contact us for professional support.

Need More Help?

If you have any questions or need further assistance, our team at AUTOTEK is here to help! Leave a comment below or contact us directly.