What Does C1937 Mean?
The steering wheel angle sensor's zero-point calibration has drifted or failed, meaning the stability control module cannot accurately determine the driver's intended steering direction. This affects electronic stability control (ESC), traction control, and potentially active steering assist systems. The driver may notice the ESC/traction control warning light illuminated, and these systems may be disabled or behave erratically during cornering.
Common Causes
40%
Steering wheel angle sensor requires recalibration after alignment, suspension work, or battery disconnect
25%
Faulty steering wheel angle sensor with internal offset drift
20%
Steering column mechanical misalignment or clock spring damage
10%
Corrupted calibration data in the stability control module
5%
Wiring harness damage or poor connections at the sensor connector
Diagnostic Steps
1
Check live data for the steering wheel angle sensor reading — with the wheels pointed straight ahead on a flat surface, the reading should be within 2-5 degrees of 0. Note the actual offset value.
2
Attempt a steering angle sensor calibration/zero-point reset using the scan tool's bi-directional controls. Turn the steering wheel lock-to-lock, then center it and confirm the calibration completes successfully.
3
If calibration fails, inspect the clock spring and steering column connector for damage. Check for continuity on the sensor signal and reference voltage wires (typically 5V reference).
4
Verify the front-end alignment is within specification — a significantly off-center steering wheel will prevent successful calibration.
5
If the sensor still cannot calibrate, measure the sensor's output voltage with a multimeter while slowly rotating the steering wheel. The output should change smoothly and proportionally; erratic readings indicate a failed sensor.
6
Check for related TSBs — some manufacturers require a specific initialization procedure after sensor or module replacement.
Estimated Repair Cost
$50 - $450
Parts + labor, varies by vehicle and location
The steering wheel angle sensor's zero-point calibration has drifted or failed, meaning the stability control module cannot accurately determine the driver's intended steering direction. This affects electronic stability control (ESC), traction control, and potentially active steering assist systems...
The most common cause of C1937 (Steering Wheel Angle Sensor Offset Failure) is: Steering wheel angle sensor requires recalibration after alignment, suspension work, or battery disconnect
Typical repair costs for C1937 range from $50 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven, but electronic stability control and traction control are likely disabled. Avoid aggressive driving, wet or icy roads, and sharp maneuvers until repaired. The vehicle's ability to correct skids and maintain traction is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1937 to identify the root cause.
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Quick Info
Category
Chassis
System
Stability Control / Steering
Difficulty
Type
Manufacturer
Recommended Tools
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