GM Service Manual Online
For 1990-2009 cars only

First, turn the steering wheel left and right. That will clear the area around the front wheels. If your vehicle has the StabiliTrak System, turn the system off by pressing and holding the Traction button so that the STABILITY SYS DISABLED message and the traction off light are illuminated on the instrument panel cluster. Then shift back and forth between REVERSE (R) and a forward gear, spinning the wheels as little as possible. Release the accelerator pedal while you shift, and press lightly on the accelerator pedal when the transmission is in gear. By slowly spinning the wheels in the forward and reverse directions, you will cause a rocking motion that may free your vehicle. If that does not get your vehicle out after a few tries, it may need to be towed out. Or, you can use the recovery hook if your vehicle has one. If your vehicle does need to be towed out, see Towing Your Vehicle .