C0200 moderate

Yaw Rate Sensor Bias Not Established

The C0200 code means the vehicle's onboard diagnostic system has detected: Yaw Rate Sensor Bias Not Established. This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $0 - $500 (parts and labor)

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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

Clear codes and drive the vehicle straight for at least one mile to allow sensor calibration
Check battery voltage -- low voltage can prevent proper sensor initialization
Inspect yaw rate sensor connector for corrosion or loose pins
Verify the sensor is mounted securely and level
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.