Steering wheel position sensor itself failed or internally worn; Damaged, chafed, or corroded wiring in the sensor circuit, especially at the steering column; Loose or contaminated electrical connector at the sensor or control module; Faulty clock spring (spiral cable) that carries the sensor signal through the rotating column; Poor ground or reference voltage supply to the sensor circuit; Steering angle sensor calibration lost after battery replacement or suspension work; Failing steering column control module or electronic power steering module

DTC codes / C04xx · Brakes, steering and suspension / C0440

C0440Steering Wheel Position Sensor Circuit

Q: What does code C0440 mean?

Steering Wheel Position Sensor Circuit. C0440 indicates that the steering wheel position sensor circuit has a fault, meaning the computer cannot reliably read the steering angle. The sensor reports how far and how fast the steering wheel is turned, and the control module has detected an out-of-range signal or a circuit continuity problem.

C0440 indicates that the steering wheel position sensor circuit has a fault, meaning the computer cannot reliably read the steering angle. The sensor reports how far and how fast the steering wheel is turned, and the control module has detected an out-of-range signal or a circuit continuity problem.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

Stability control (ESC) and traction control warning lights illuminated on the dashboard
Steering assist warning light or a message such as 'Service Power Steering' displayed
Reduced or disabled power steering assist, making the wheel harder to turn
Stability control and traction control systems deactivated, often with a chime
Vehicle pulling or wandering because the system cannot correct steering angle input
Often no symptoms besides the warning light, with normal steering feel

Common causes, most likely first

Steering wheel position sensor itself failed or internally worn
Damaged, chafed, or corroded wiring in the sensor circuit, especially at the steering column
Loose or contaminated electrical connector at the sensor or control module
Faulty clock spring (spiral cable) that carries the sensor signal through the rotating column
Poor ground or reference voltage supply to the sensor circuit
Steering angle sensor calibration lost after battery replacement or suspension work
Failing steering column control module or electronic power steering module

How to diagnose and fix it

Scan all modules for codes and record freeze-frame data to confirm C0440 is current and not history
Inspect the sensor connector and wiring at the steering column for looseness, corrosion, or chafing
Check sensor reference voltage and ground at the connector with a multimeter
Perform a steering angle sensor calibration or relearn procedure with a scan tool
Test the clock spring continuity if the sensor signal is intermittent when turning the wheel
Replace the steering wheel position sensor if voltage and wiring tests pass but the signal is erratic
Clear codes and road test to verify the repair, then recheck for returning codes

What the steering angle sensor really does

A weak or failing battery can set C0440 because the sensor loses its learned center position when voltage drops during cranking.
Many vehicles require a steering angle sensor calibration after an alignment, and skipping it will set this code even with a perfectly good sensor.
The clock spring is a common hidden cause because it carries the sensor signal through the rotating column, and a broken spiral conductor mimics a failed sensor.
C0440 can be stored by the stability control module rather than the power steering module, so scanning only one module may miss the underlying fault.
Aftermarket steering column repairs or a replaced combination switch can leave the sensor misaligned, triggering the code until a relearn is performed.

Can I keep driving with C0440?

The vehicle remains steerable, but stability control and traction control are disabled, which reduces safety in slippery conditions or emergency maneuvers. Avoid high-speed driving and sharp evasive maneuvers, and have the fault diagnosed promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.