Diagnostic Instructions
DTC Descriptor
DTC C0252 00: VSES Sensors Uncorrelated
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 steering angle has been centered. |
Conditions for Setting the DTC
One of the following conditions exist:
| • | VSES is engaged for 10 seconds with the yaw rate error always in either understeer or oversteer. |
| • | The yaw rate error is greater then 10 degrees/second for 5 seconds, and the yaw has not changed and the lateral acceleration is less than 0.5 g. |
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The ABS indicator illuminates. |
| • | The Stabilitrak indicator illuminates. |
| • | The driver information center (DIC) displays All Wheel Drive Off/ Service Traction Control / Service Stabilitrak message. |
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 100 consecutive drive cycles. |
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.
