Chassis, generic

C0066 Pitch Rate Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Pitch rate gyro failed, drifting or out of range
Sensor cluster loose or tilted on its mount
Harness or connector fault at the sensor cluster

Symptoms

  • ESC or stability warning lamp on
  • Rollover and stability functions reduced

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

inertial sensor cluster

Related codes

C0064C0065C0063C006A

References: bosch-mobility.com, patents.google.com, patents.google.com.