The problem must be with the brake system. With the automatic transmission system, apart from the brake system functioning to slow down or bring the vehicle to a stop, it also functions as the clutch which allows the vehicle’s gear to be engaged when the brake pedal is pushed (stepped on).
Your vehicle’s gear lever, like in every vehicle, will usually be on park as you start the engine. You will then have to push (step on) the brake pedal for you to engage the gear to drive (D), reverse (R), neutral (N), etc. But if the gear lever remains stiff on park, there being difficulty in shifting it as you wish, then something must be wrong with the brake system which, we have observed, also functions as the vehicle’s clutch system.
You will have to visit your mechanic to have a proper look at things for you beginning from the brake calipers. Perhaps, they are not functioning properly and may need to be replaced.
The brake calipers house the vehicle’s brake pads and pistons. They function to slow down the wheels of the vehicle by creating friction with the brake rotors. When you push (step on) the brake pedal, brake fluid creates pressure on the pistons in the brake calipers, forcing the brake pads against the brake rotor and slowing down your vehicle or bringing it to a stop.
At the same time functioning as the vehicle’s clutch system, once the brake pedal is pushed (stepped on) and brake fluid creates pressure on the pistons in the brake calipers, forcing the brake pads against the brake rotors, this electromechanical process signal is immediately sent to the vehicle’s ECU and further communicated to the valve body and the gear lever is allowed to be engaged (shifted) as you may wish.
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