For 1990-2009 cars

### 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 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.

• | VSES is active.

### 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

• | 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

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