Service Information

Volt

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: Vehicle Stability Control Module Sensors Correlation Malfunction

The electronic brake control module controls the vehicle stability control system by monitoring the inputs from the multi-axis acceleration sensor, wheel speed sensors, and the steering wheel angle sensor. All of the sensors need to correlate to the vehicle dynamics during the initial drive off in order to enable vehicle stability control. Normally this takes place within 100 metres (110 yards).

Conditions for Running the DTC

•	Vehicle ON or Vehicle in Service Mode.

•	Ignition voltage is greater than 10 V.

•	The steer wheel angle sensor has been centered.

•	The vehicle stability control system has not been initialised.

•	The direction (understeer or oversteer) of the yaw rate error has not changed.

•	Vehicle is moving.

Conditions for Setting the DTC

•	Vehicle is driven in a straight line without centering or initialisation the stability control system.

•	The yaw rate has not changed and the lateral acceleration is less than 0.5 g.

Action Taken When the DTC Sets

•	The traction control/stability control indicator turns ON.

•	The Service StabiliTrak message is displayed on the driver information centre.

•	The electronic brake control module disables the electronic stability control for the duration of the drive cycle.

Conditions for Clearing the DTC

•	The condition for setting the DTC is no longer present.

•	The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

Diagnostic Aids

•	The DTC C0252 can be set if the vehicle has been driven above 8 km (5 mph) on a winding road prior to the vehicle stability control system initialisation with the brake pedal applied and while accelerating.

•	Driving off with constant steering wheel input or brake switch activation.

•	An improperly mounted or loose combination multi-axis acceleration sensor.

•	Stuck brake pedal position sensor.

•	Improper steering wheel alignment or tyre pull.

•	An internal multi-axis acceleration sensor failure.

•	An electronic brake control module internal failure.

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

Vehicle in Service Mode.
Verify that DTC C0186, C0196 or C0710 is not set.

⇒	*If any of the DTCs are set*

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

⇓	*If none of the DTCs are set*

Verify the B119 multi-axis acceleration sensor is installed correctly.

⇒	*If loose or incorrect installation*

Correct the installation of the component, refer to Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement .

⇓	*If installed correctly*

Verify the DTC does not set while operating the vehicle under normal driving conditions.

⇒	*If the DTC sets*

4.1.	Replace the K17 electronic brake control module.

4.2.	Verify the DTC does not set while operating the vehicle under normal driving conditions.

⇒	If the DTC sets, replace the Q5 brake pressure modulator.

⇓	If the DTC does not set

4.3.

All OK.

⇒	*If the DTC does not set*

All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

•	Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement

•	Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement

•	Control Module References for electronic brake control module replacement, programming and setup