GMC savana 2001 用户手册

Your vehicle has an automatic transmission shift lock
control system. You have to fully apply your regular
brakes before you can shift from PARK (P) when the
ignition is in RUN. See “Automatic Transmission” in
the Index.

If you cannot shift out of PARK (P), ease pressure on
the shift lever and push the shift lever all the way up
into PARK (P) as you maintain brake application. 
Then, move the shift lever into the gear you want.

If you ever hold the brake pedal down but still can’t
shift out of PARK (P), try this:

1. Turn the key to OFF.

2. Apply and hold the brake until the end of Step 4.

3. Shift to NEUTRAL (N).

4. Start the vehicle and then shift to the drive gear 

you want.

5. Have the system fixed as soon as you can.