Yaw Rate Sensor Bias Not Established
What does C0200 mean?
The C0200 code means the vehicle's onboard diagnostic system has detected: Yaw Rate Sensor Bias Not Established. This is a moderate severity code.
Common Symptoms
- Stability control light on
- Traction control light on
- Service StabiliTrak message
- System may work intermittently
- Warning appears after vehicle sits for extended period
Probable Causes (Ranked by Likelihood)
- Yaw rate sensor not calibrated after replacement or battery disconnect Very High
- Sensor connector issue causing intermittent signal High
- Vehicle not driven on straight road after reset for calibration Moderate
- Yaw rate sensor beginning to fail Moderate
- Low battery voltage during startup affecting sensor initialization Low
Step-by-Step Diagnostic Procedure
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Clear codes and drive the vehicle straight for at least one mile to allow sensor calibration
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Check battery voltage -- low voltage can prevent proper sensor initialization
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Inspect yaw rate sensor connector for corrosion or loose pins
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Verify the sensor is mounted securely and level
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If code persists after calibration drive, test the sensor output in live data
Frequently Asked Questions
What does bias not established mean?
The yaw rate sensor needs to establish a baseline or zero point reading when the vehicle is stationary and driving straight. If it cannot establish this reference point, it sets this code.
Can clearing the code and driving fix C0200?
Often yes. After battery disconnection, sensor replacement, or module programming, the sensor needs a calibration drive. Clear the code, then drive straight at moderate speed for 1-2 miles.
Will a weak battery cause this code?
Yes. If battery voltage is low during startup, the yaw rate sensor may not properly initialize and establish its bias. Test the battery and charging system if this code appears after starting.