2009 Chevrolet Express Van Owner's Manual - Page 206

StabiliTrak® System The vehicle may have a vehicle stability enhancement system called StabiliTrak. It is an advanced computer controlled system that assists the driver with directional control of the vehicle in difficult driving conditions. StabiliTrak activates when the computer senses a discrepancy between the intended path and the direction the vehicle is actually traveling. StabiliTrak selectively applies braking pressure at any one of the vehicle's brakes to assist the driver with keeping the vehicle on the intended path. When the vehicle is started and begins to move, the system performs several diagnostic checks to insure there are no problems. The system may be heard or felt while it is working. This is normal and does not mean there is a problem with the vehicle. The system should initialize before the vehicle reaches 20 mph (32 km/h). In some cases, it may take approximately 2 miles (3.2 km) of driving before the system initializes. Press and hold the StabiliTrak button located on the instrument panel for more than five seconds to turn off StabiliTrak and part of the traction control system. The StabiliTrak light comes on the instrument panel cluster when the system is turned off or requires service. For more information, see StabiliTrak® Indicator Light on page 3-33. 4-6