C0252

DTC C0252

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 Descriptor
DTC C0252 00
- VSES Sensor Uncorrelated




Circuit/System Description

The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (EBCM) and monitors the yaw rate/lateral accelerometer sensor, and steering wheel angle sensor inputs to ensure they correlate within their desired ranges.


Conditions for Running the DTC

* The steer angle has been centered.
* The VSES is active.
* The centered lateral acceleration value is less than 0.5 g.
* The yaw rate error is less than 6 degrees/second.



Conditions for Setting the DTC

One of the following conditions exists:

* The DTC sets when 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 ABS/TCS/VSES for the duration of the ignition cycle.
* The ABS and VSES indicators illuminate.
* The driver information center (DIC) displays the Service Traction Control and Stabilitrak message.



Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM automatically 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
* An improperly mounted yaw rate/lateral accelerometer
* An internal yaw rate/lateral accelerometer failure



Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views
Description and Operation

ABS Description and Operation (Description and Operation)
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

1. Perform the steering angle sensor calibration.
2. Clear the DTC with a scan tool, and operate the vehicle within the conditions for setting the DTC.
3. Verify DTCs : C0186, C0196,C0252, C0253, or C0710 are not set.

• If DTCs C0186, C0196,C0253, or C0710 are set, refer toDiagnostic Trouble Code (DTC) List - Vehicle


• If only DTC C0252 set as current, replace the EBCM.




Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control Module References for EBCM replacement, setup, and programming