Steering Angle Sensor Circuit Failure
The C1277 code indicates a fault in the steering angle sensor circuit (signals 1 and 2). This sensor is critical for the Vehicle Stability Control (VSC) system, measuring steering wheel angle and rotation speed. The ECU detects a discrepancy, out-of-range signal, or short circuit in the redundant signals, disabling VSC for safety.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or uncalibrated steering angle sensor
- Open or short circuit in sensor wiring
- Loose or corroded electrical connections in sensor harness
- Faulty ground in sensor circuit
- Internal failure in VSC/ABS ECU
3. Symptoms You Will Notice
- VSC warning light illuminated
- ABS warning light on
- Traction control disabled
- Steering wheel off-center or erratic behavior
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Inspect steering angle sensor wiring and connectors for damage or corrosion
Test sensor power, ground, and signal circuits with a multimeter
Perform steering angle sensor calibration using a scan tool
If wiring is intact, replace the steering angle sensor
If problem persists, test or replace the VSC/ABS ECU
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive with this code active. The VSC system is disabled, increasing the risk of loss of vehicle control during emergency maneuvers. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the sensor needs replacement ($150-$400) plus labor and calibration, or if wiring repairs are needed.