DTC C0186 or C0196. Chevrolet Tahoe

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Tahoe - 4WD 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC C0186 or C0196

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC C0186 55: Lateral Accelerometer Circuit Expected Number of Transition/Events Exceeded

DTC C0186 5A: Lateral Accelerometer Circuit Plausibility Failure

DTC C0186 0F: Lateral Accelerometer Circuit Erratic

DTC C0196 55: Yaw Rate Circuit Expected Number of Transition/Events Exceeded

DTC C0196 5A: Yaw Rate Circuit Plausibility Failure

DTC C0196 0F: Yaw Rate Circuit Erratic

Circuit/System Description

The lateral accelerometer and the yaw rate sensors are combined into one sensor external to the electronic brake control module (EBCM). The vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The EBCM recieves the yaw/lateral accelerometer sensor data from dedicated serial data circuits.

Conditions for Running the DTC

•	Ignition ON.

•	Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

•	The yaw/lateral accelerometer sensor fails an internal self test.

•	The correlation error between the yaw/lateral accelerometer sensor and steering angle sensor.

Actions Taken when the DTC Sets

•	The EBCM disables the StabiliTrak for the duration of the ignition cycle.

•	A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present.

•	The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Diagnostic Aids

An incorrectly mounted sensor can cause these faults.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition On, verify that DTC U2142 or C0292 is not set.

⇒	If any of the DTCs are set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

With a scan tool, clear the DTC.
Test drive the vehicle while observing the scan tool Yaw Rate and Lateral Accelerometer Sensor parameter. The parameters should vary as the vehicle changes directions.

⇒	If the parameters are locked or erratic, replace the yaw/lateral accelerometer sensor.

Replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

•	Control Module References for EBCM replacement, setup, and programming