Chassis, generic

C05B2 Steering Wheel Angle Sensor Signal - Yaw Rate Sensor Signal Correlation

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

C05B2 flags a mismatch between how far the driver has turned the wheel and how quickly the car actually rotates about its vertical axis. The stability controller turns steering wheel angle and road speed into an expected yaw rate through a single-track vehicle model; a Siemens patent applies that model only up to about 4 m/s² of lateral acceleration. Bosch gives a permitted gap of roughly 1 to 4.5 deg/s between the yaw sensor and the steering-based value and keeps stability control switched off while the fault stands, with traction control still working. No manufacturer publishes C05B2 itself. Frequent triggers are a steering angle sensor left uncalibrated after alignment or steering repairs, a loose or shifted yaw sensor, or a drifting offset. ESC is unavailable and its warning lamp remains lit.

Likely causes

Steering angle sensor not recalibrated after wheel alignment, steering or column work
Yaw rate sensor or sensor cluster loose, rotated or wrongly installed
Offset drift or internal fault in the yaw rate or steering angle sensor
Mismatched tyres or bent steering parts making the vehicle model invalid

Symptoms

  • ESC and often traction control warning lamp on
  • Stability control interventions unavailable
  • Steering wheel off-centre when driving straight, if alignment is the cause

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–600
Time0.5–2 h

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

Parts involved

steering angle sensoryaw rate sensoresp control module

Related codes

C0497C0608C052AC0830

References: patents.google.com, patents.google.com, diva-portal.org, law.cornell.edu.