Stepped on the break and it doesn't want to come out of park
shift interlock solenoid, perhaps. You can also check if the brake lights come on when depressing brake pedal, to make sure the brake pedal position switch is working.
To get out of park try this. Turn the ignition key one click clockwise from the locked position. No lights or anything on the instrument cluster should be lit up. Depress the brake pedal and try to shift out of park. If you can shift to neutral and start the truck. If this works the shift interlock solenoid is bad. HTH. -Jim
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