For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition
65 WarningShifting out of Park
To shift out of P (Park):
Apply the brake pedal.
Turn the ignition on.
Press the shift lever button.
Move the shift lever.
If you still are unable to shift out of
P (Park):
Fully release the shift lever
button.
Hold the brake pedal down and
...