Nissan Titan stuck in park

check to see if the parking brake is stuck,

find the shift lock solenoid override (if applicable),

the shift linkage.

If parked on a hill the force of gravity could be forcing your transmission

to put pressure on the parking lock in the transmission.

you will need to rock the vehicle.

from the driver’s seat. Just throw your weight around.

Turn the vehicle engine ON.

Rock the vehicle with your foot off the brake.

Press the brake down when you have rocked toward the hill

You want to “catch” it with the brake at the right time.

This will take pressure off of the parking lock.

Apply light pressure to the shifter

The shift lock solenoid keeps you from shifting out of park

without your foot on the brake.

May have an override button.

Check for a cosmetic plug (pop it out)

May have bad brake light switch.

Check to see if brake lights come ON

May have bad fuse

May be bad ignition switch