C0730Electric Power Steering Motor Position Sensor Circuit
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Neither the publicly available J2012 lists nor NHTSA bulletins or maker indexes show C0730, so its use is not publicly verifiable. The sensor it names reports the rotor angle of the brushless assist motor, without which the module cannot commutate the phases or run field-oriented current control. Infineon places a rotary magnetic angle sensor on the motor and offers dual-die parts such as TLE5012BD and TLE5x09D so that two independent readings can be compared; NXP lists encoder or resolver processing and rotor position among the core jobs of the steering controller. A circuit fault means the angle signal is missing, shorted or electrically implausible. Without a trustworthy rotor angle the motor cannot be driven safely, so assist is withdrawn, often abruptly, and the steering turns heavy.
- What you may notice
- Steering assist drops out suddenly, warning lamp on
- Steering jerky or uneven while turning
- Likely causes
- LikelyRotor position sensor in the EPS motor defective
- PossiblePoor connection between sensor and control board
- RareSensor magnet loose or misaligned after repair
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.