C0252
DTC C0252
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC C0252
- 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 VSES is active.
* 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 antilock brake system (ABS)/traction control system (TCS)/VSES and for the duration of the ignition cycle.
* A malfunction DTC will set.
* The ABS indicator turns ON.
* The Stability Off indicator turns ON.
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.
* Using a scan tool
Diagnostic Aids
Important: It is important to check the wiring harness connections to the following items:
* EBCM
* Brake pressure sensor
* Steering angle sensor
* Yaw/lateral accelerometer sensor
* LF wheel speed sensor (WSS)
* RF WSS
* LR WSS
* RR WSS
* During diagnosis, park the vehicle on a level surface.
* Inspect the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
* Find out from the customer the conditions under which the DTC was set. This information will help to duplicate the failure.
* The Snapshot function on the scan tool can help find an intermittent DTC.
Reference Information
Schematic Reference
Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
ABS Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Verify that DTC C0186, C0196, C0253, or C0710 is not set.
If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).
Repair Instructions
Diagnostic Test Drive (Description of On-Board Diagnostics)
Repair Verification
Ignition ON, observe the ABS DTCS function in EBCM VSES scan tool data display.
Does any DTC other than DTC C0252 reset. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).
Does DTC C0252 reset, refer to Diagnostic Test Drive (Description of On-Board Diagnostics).