Dodge ram1500 driver side door unable to open manually or remote

Check your wiring. I know that these trucks have that problem mainly with the passenger side but I'm sure it could happen to the driver side as well. See what happens is they run the wiring through the door near the hinges and when you open/shut your door it wears the wiring causing it to short. My passenger side doesn't work with the passenger controls but will work on the master controls. I will be fixing mine here shortly.

The rod or cable inside the door is not hooked up.

If this is code number P0875 then that code is Transmission Fluid Pressure Sensor/Switch "D" Circuit. It is most likely the switch is bad. If memory serves me correctly that transmission has one on the drivers side near the transmission pan. though a Haynes manual or a image from the dealership would be more precise.

Depends on what fuses you are looking for. Open driver door its right on side of dash against door. Other is under hood.

there is something jaming the handle or broken. remove door panel. check to see if or what is jamed bent or broken. easy to repair.

JACK LOCATION
Removal (All Models)
The jack and jack tools are stored under the front
passenger seat. Lift the flap on the side of the seat for
access.
Remove the jack and tools by removing the wing bolt and
sliding the assembly from under the sea

Check your owners manual. 2 Places. Under hood AND Left side of dash on the end, visible Only with drivers door open.

Sounds like the link rod to the latch are jammed in the locked position by something inside the door or it came off. Any way, you have to remove the door panel to get access to it.

It's probably the plastic rod that connects the handle to the lock, that needs to be adjusted or replaced

No heat can mean low coolant in the radiator. Check that. Also would mean you have a coolant leak. Might possibly be a restricted heater core. Possibly a blend door in the dash that quit working. Thermostat could be faulty allowing coolant to flow continuously.