Chassis, generic

C0497 Yaw Rate Sensor Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Neither the accessible J2012 lists nor any manufacturer bulletin or service text mention C0497, so its use cannot be confirmed publicly. The title describes a yaw rate signal that is electrically present but does not match how the car moves. Stability units test this against estimates: a Siemens patent builds a reference yaw rate from steering angle, wheel speeds and accelerations, expects a value near zero at standstill and marks the sensor faulty when the gap passes a threshold. A Ford patent turns yaw rate and lateral acceleration into two road-bank estimates and counts a yaw fault when one exceeds a limit taken from the other, then disables brake control. A Linköping thesis for ZF tried such residual checks with injected faults. Saab gives a ±138°/s test range.

Likely causes

Yaw rate sensor offset or drift
Sensor loose, twisted or mounted in the wrong orientation
Wrong comparison input (steering angle not calibrated, wheel speed fault)

Symptoms

  • ESC lamp on, stability control switched off
  • Unwanted brake interventions when cornering

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

yaw rate sensorlateral acceleration sensorsteering angle sensor

Related codes

C0196C0496C051CC05B2

References: patents.google.com, patents.google.com, diva-portal.org, saabwisonline.com.