Transmission Error Code

[BamBam Ram]

Hello, I have a 2014 Ram 1500 when going to put the truck into drive or reverse the gears do not engage. Check Engine light came on and hooked up a OBD-II to see what codes came up. The codes that came up are:

P0841 (comes up 3x) (Transmission FluidPressure Sensor/Switch A Circuit Range/Performance),
P0868 (comes up 3x) (Transmission FluidPressure Low),
P0934 (Hydraulic Pressure Sensor Circuit Low),
P0882 (TCM power input signal low)

Any ideas where to even begin?