Work in the automotive industry, play in the automotive industry. Cars or computers are my Jam. If I can take it apart and upgrade it, I'm gonna try.
Answer to "No Acceleratror pedal control"It is possible it could be a bad throttle body module. The code that you got basically means that the PCM is seeing low voltage (below .17) on the throttle position sensor circuit. Usually this is a pedal but it's possible to be the throttle position sensor or the actuator motor. Both of which are serviced in the throttle body. The throttle body is available on the aftermarket if you don't want to go factory.
Answer to "My car is hesitant to accelerate. Is it brake issue?"Not sure if the issue is related but often times a Nissan having a difficult time accelerating from a dead stop is an issue in the CVT. These transmissions can be finicky and need to be serviced on time or else you're looking at a big repair bill if it's not under warranty. The transmission fluid should be flushed around every 50 to 60 thousand miles. If the fluid gets burnt then it will start to cause issues taking off from a stop, especially once the car gets hot. Take it to the dealership to be serviced to make sure you're getting the correct fluid.