What Does C1956 Mean?
The stability control module has detected that the steering angle sensor is electrically connected but producing irrational, erratic, or out-of-range output that does not correspond to actual steering wheel position or movement. The sensor may be sending inconsistent data, jumping between values, or stuck at an incorrect angle. ESC and traction control will be disabled because the module cannot trust the steering direction data.
Common Causes
30%
Degraded steering angle sensor with worn internal encoder producing erratic output
25%
Steering angle sensor requires recalibration after steering or suspension service
20%
Intermittent clock spring connection causing signal glitches during steering rotation
15%
Electromagnetic interference or voltage supply issue affecting sensor accuracy
10%
Mechanical misalignment between the sensor and steering shaft (sensor slipped on its mount)
Diagnostic Steps
1
Monitor the steering angle sensor PID in live data while slowly turning the wheel from lock to lock. The reading should change smoothly and continuously without jumps, dead spots, or reversals. Note any position where the reading becomes erratic.
2
With the wheel centered and straight, verify the reading is close to 0 degrees. A large offset may indicate the sensor needs recalibration rather than replacement. Attempt a zero-point calibration procedure.
3
Check the 5V reference voltage at the sensor while turning the wheel. It should remain stable at 5.0V throughout the steering range. Fluctuation indicates a supply or ground problem.
4
Perform a wiggle test on the sensor connector and clock spring harness while monitoring live data. Any reading disruption during wiggling points to an intermittent connection.
5
If the sensor has an optical or magnetic encoder disk visible during inspection, check for contamination (dust, grease) on the encoding surfaces. Some sensors can be cleaned; others must be replaced.
6
If calibration does not resolve the issue and wiring is good, replace the steering angle sensor. Perform the initialization/calibration procedure after installation.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
The stability control module has detected that the steering angle sensor is electrically connected but producing irrational, erratic, or out-of-range output that does not correspond to actual steering wheel position or movement. The sensor may be sending inconsistent data, jumping between values, or...
The most common cause of C1956 (Steering Angle Sensor Circuit Failure) is: Degraded steering angle sensor with worn internal encoder producing erratic output
Typical repair costs for C1956 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ESC and traction control are disabled due to unreliable steering angle data. The vehicle cannot detect the difference between intended and actual vehicle direction. ABS should still work. Exercise extra caution while driving, especially in conditions requiring stability control intervention. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1956 to identify the root cause.
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Quick Info
Category
Chassis
System
Stability Control / Steering
Difficulty
Type
Manufacturer
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