C05B2 code meaning
Steering Wheel Angle Sensor Signal - Yaw Rate Sensor Signal Correlation
What C05B2 means
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.
C05B2 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of C05B2
- ESC and often traction control warning lamp on
- Stability control interventions unavailable
- Steering wheel off-centre when driving straight, if alignment is the cause
Common causes of C05B2
- Most likelySteering angle sensor not recalibrated after wheel alignment, steering or column work
- PossibleYaw rate sensor or sensor cluster loose, rotated or wrongly installed
- PossibleOffset drift or internal fault in the yaw rate or steering angle sensor
- Less likelyMismatched tires or bent steering parts making the vehicle model invalid
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Steering angle sensorYaw rate sensorEsp control module
What each part of C05B2 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B2 | The exact fault in that area. |
What to do next
- Note C05B2 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C05B2
What does C05B2 mean?
C05B2 means "Steering Wheel Angle Sensor Signal - Yaw Rate Sensor Signal Correlation". C05B2 flags a mismatch between how far the driver has turned the wheel and how quickly the car actually rotates about its vertical axis. It is a generic code, so it means the same on every make.
Is it safe to drive with C05B2?
Drive gently and only to a workshop. With C05B2 the car can go into limp mode (reduced power) to protect itself.
Will C05B2 fail an emissions test?
C05B2 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C05B2 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C05B2 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.