C0064 Roll Rate Sensor

C0064 covers the roll rate sensor, a gyroscope that measures rotation about the vehicle's longitudinal axis. NHTSA's brake safety study names roll rate among the vehicle dynamics inputs of the ABS/ESC module, and roll stability control uses it, mainly on tall vehicles, to spot the onset of a rollover and counter it with braking and torque reduction. The module checks the roll signal against lateral acceleration and the other inertial channels and sets C0064 when it is out of range, stuck, noisy or implausible. In current six-axis inertial units such as Bosch's IMU the roll gyro shares one housing with pitch and yaw gyros and three accelerometers. Roll stability control switches off and the ESC lamp lights; base braking remains. No manufacturer documents this code publicly.

Likely causes

Symptoms

• Roll stability control disabled
• ABS/ESC warning lamp on
• Rollover mitigation unavailable

Repair estimate

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

Parts involved

Related codes

References: rosap.ntl.bts.gov, bosch-mobility.com, patents.google.com.