Sometimes I can't get the gear shift to move from park into reverse or drive.
There is a solenoid that prevents the shifter from coming out of park unless your foot is firmly placed on the brake pedal. It is likely that the solenoid has failed and is not able to be activated to let the shifter come out of park. This is a pretty common problem. I would ask for help from a mechanic, possibly from YourMechanic, to check over your shifter to see if in fact the shift lock solenoid is faulty or not.
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