What Does C1955 Mean?
The stability control module has detected an open circuit in the steering angle sensor. This sensor measures the position and rate of rotation of the steering wheel and is essential for determining the driver's intended direction of travel. Without it, the ESC module cannot compare intended steering direction with actual vehicle movement to detect loss-of-control situations. ESC and traction control will be disabled.
Common Causes
30%
Faulty clock spring (spiral cable) causing an open in the steering angle sensor circuit
25%
Disconnected or corroded connector at the steering angle sensor (located on the steering column)
25%
Failed steering angle sensor with internal open circuit
15%
Broken wire in the steering column harness from repeated steering wheel rotation wear
5%
ESC module connector pin damage on the steering angle sensor circuit
Diagnostic Steps
1
Check the steering angle sensor live data PID — if it shows no data or a fixed invalid value, the open circuit is confirmed. Turn the wheel slowly and verify whether the reading changes at all.
2
Locate the steering angle sensor on the steering column (typically at the base of the column or integrated into the clock spring). Verify the connector is seated and locked. On some vehicles, the sensor is behind steering column covers that must be removed.
3
With the sensor connector disconnected, measure the sensor's internal resistance/continuity across the signal pins per the service manual specification. An infinite reading confirms an internal sensor failure.
4
If the sensor tests good, check wiring continuity from the sensor connector to the ESC module connector. Pay special attention to the column-to-body harness junction connector, which is a common failure point.
5
If the clock spring was recently replaced or the steering column was serviced, verify the clock spring is properly centered and the internal ribbon cables are not torn. A miscentered clock spring will eventually break internal conductors.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The stability control module has detected an open circuit in the steering angle sensor. This sensor measures the position and rate of rotation of the steering wheel and is essential for determining the driver's intended direction of travel. Without it, the ESC module cannot compare intended steering...
The most common cause of C1955 (Steering Angle Sensor Circuit Open) is: Faulty clock spring (spiral cable) causing an open in the steering angle sensor circuit
Typical repair costs for C1955 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ESC and traction control will be fully disabled. The system cannot determine the driver's intended steering direction to compare against actual vehicle trajectory. ABS braking should still function. Drive with extra caution, reduce speed in curves, and avoid slippery conditions. Prioritize this repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1955 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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