Chevrolet Silverado / GMC Sierra. Service manual — part 715

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

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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 internal 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 (With JL4) or ABS Description and Operation (Without
JL4)

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

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

DTC.

3. Verify DTCs : C0186, C0196, C0252, C0253, or C0710 are not set.

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

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

DTC C0253

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 C0253 00

Centering Error

Circuit/System Description

The usable output voltage range for the yaw rate sensor signal and lateral accelerometer sensor
signal is 0.25-4.75 volts. The scan tool will report zero lateral acceleration or yaw rate as 2.5
volts with no sensor bias present. The sensor bias compensates for sensor mounting alignment
errors, electronic signal errors, temperature changes, and manufacturing differences.

Conditions for Running the DTC

The vehicle speed is greater than 40 km/h (25 mph).

Conditions for Setting the DTC

The vehicle has been driven for 10 minutes without completing steer angle centering.

Action Taken When the DTC Sets

The EBCM disables the VSES for the duration of the ignition cycle.

The driver information center (DIC) displays the TRAC/STABILITRAK OFF message.

The antilock brake system (ABS) and traction control system (TCS) remain functional.

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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.

Internal yaw and lateral acceleration sensor failure.

EBCM internal failure.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation (With JL4) or ABS Description and Operation (Without
JL4)

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

2008 Chevrolet Silverado 1500

2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado