Chevrolet 4500 HD 2023 Manual page 176

If You Cannot Move the Selector Lever from
the P Position
Caution
When the selector cannot be operated
from the P position to any other position
even after performing the operation
below repeatedly, the shift lock system
may have a failure. Have the vehicle
inspected at your dealer.
If you cannot move the selector lever from
the P position after starting the engine,
perform the following checks:
Check that you are firmly pressing the
brake pedal. When the brake pedal is not
pressed, the shift lock system operates
and the selector lever cannot be shifted
from P to any other position.
Check if the area where your vehicle is
parked is not a slope.
If your vehicle is parked on a downside
slope, the operation of the selector lever
may become heavy to move. In this case,
you can operate the selector lever more
smoothly by moving the selector lever
towards the front of the vehicle while
pressing the button.
Releasing the Shift Lock in an Emergency
If moving of the selector lever from P to
another position is still not possible even
after performing the instructions given in
the steps above, with the brake pedal fully
pressed and the vehicle parked on a flat
surface, carry out the procedure described
under If You Cannot Move the Selector
Lever from the P Position .
Driving and Operating 175