need to know what a p 0800 code is also a p 0900 code for a 2003 darango
P0900 Clutch Actuator Circ/Open
P0800 Transfer Case Ctrl Sys (MIL Request)
There is a long list of P codes. Better to ask for a P code. All P codes are used for multiple cars. I know for a fact that every Chrysler dodge jeep Plymouth use p0300 for multiple cylinder missfire.
P = Powertrain related followed by 4 digits.
cooling thermostat
Charging system , voltage too low
Trouble code P0840 means:Transmission fluid pressure sensor/switch "A" circuit
Check the thermostut at first.  Your stut temp is too low. 
Its clear no codes everything ok
Trouble Code P1762 means:Governor pressure sensor offset voltage too low or high
Secondary Air Injection System Incorrect Flow Detected
The engine codes for a 2000 Dodge would be either 2 digits long or 4 digits and start with a "P".The engine codes for a 2000 Dodge would be either 2 digits long or 4 digits and start with a "P".
Done means that the system is done flashing codes. If that Is all it flashed, there are no codes.
It is done flashing codes. If that is the only message you got, there are no codes present.