C0440Steering Wheel Position Sensor Circuit
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0440 cannot be verified publicly; searches of the available J2012 tables, GM bulletin PIP5094 and the full NHTSA index found no hit. Its title is word for word that of C0455, which GM does use for the steering wheel position sensor read by the brake module; the description here sticks to the sensor. It sits on the steering column and gives stability control the driver's intended direction. Bosch builds it with two measuring gears of different tooth counts, so the absolute angle is known over several turns, and sends angle and rate over CAN with internal plausibility checks. Saab's 9-5 sensor uses gears with 28 and 26 teeth and needs a zero calibration after front end work. GM bulletin PI0639D traces C0455 on 2007–17 trucks and vans to fretting corrosion at the connector.
- What you may notice
- Stability control and traction control warning lamps on
- Service StabiliTrak or ESP message
- Likely causes
- LikelyFretting corrosion or loose fit at the sensor connector
- PossibleZero position not calibrated after alignment or column work
- RareSteering angle sensor internally defective
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.