1996 Dodge Caravan codes?

I think code 23: Is Incoming air temperature sensor may be bad.

code 42 : Automatic shutdown relay circuit open or shorted.

what is code 55 ?

There are relays under the hood. Look at the diagram on the relay cover. Try changing some of them around to see if a relay or two is bad.

32 EGR gases not working
42 Automatic shutdown relay circuit open or shorted
42 Fuel pump relay control circuit
42 Fuel level unit - no change over miles
OR
42 Z1 voltage missing when autoshutdown circuit energized
55 End of codes