Diagnostic Instructions
DTC Descriptor
DTC C0252 00: Vehicle Stability Enhancement System (VSES) Sensors Uncorrected
Circuit/System Description
The electronic brake control module (EBCM) controls the vehicle stability enhancement system (VSES) by monitoring the inputs of the yaw rate/lateral accelerometer sensor, and steering wheel angle sensor . The readings are compared to an internal calibrated
value so it knows if the vehicle is having an instability condition to activate the VSES. When the readings indicate a VSES event is occurring longer than 10 seconds is not possible under normal conditions. The yaw/lateral sensor is a combination sensor
in one component.
Conditions for Running the DTC
| • | The steer angle has been centered. |
| • | The direction, understeer or oversteer, of the yaw rate error has not changed. |
| • | The lateral acceleration is less than 0.5 grams. |
Conditions for Setting the DTC
One of the following conditions occur:
| • | The VSES is engaged for 10 seconds with the yaw rate error always in either understeer or oversteer. Under this condition, this DTC will set by itself. |
| • | The yaw rate error is greater than 10 degrees/second for 5 seconds. |
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the ABS/traction control system (TCS)/VSES and for the duration of the ignition cycle. |
| • | The ABS indicator illuminates. |
| • | The Stability Off indicator illuminates. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Diagnostic Aids
The following conditions can cause this concern:
| • | Improper steering alignment or tire pull |
| • | An improperly mounted or loose combination yaw rate/lateral accelerometer sensor |
| • | An internal yaw rate/lateral accelerometer failure |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
Verify that DTC C0186, C0196, C0253, or C0710 is not set.
