C0066Pitch Rate Sensor
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Public SAE J2012 code lists still mark C0066 as ISO/SAE reserved, and no manufacturer documents the code in a retrievable bulletin or service text. One current code table assigns it to the pitch rate sensor, which fits its place between roll rate (C0064), vertical acceleration (C0065) and the yaw/longitudinal pair (C0069); the title follows that use. Such a sensor tracks rotation about the vehicle's lateral axis, as when the body dives under braking or squats under acceleration. Bosch's six-axis inertial unit reports pitch rate next to yaw and roll rate, and a GM patent compares the measured pitch rate with a virtual value built from suspension heights, wheel speeds and accelerations, flags a fault from the difference and rebuilds the signal. Where fitted, a fault limits rollover and stability functions and lights the ESC lamp.
- What you may notice
- ESC or stability warning lamp on
- Rollover and stability functions reduced
- Likely causes
- PossiblePitch rate gyro failed, drifting or out of range
- PossibleSensor cluster loose or tilted on its mount
- RareHarness or connector fault at the sensor cluster
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.