There are hundreds, if not thousands of possible codes.
I have a 1989 Dodge B250...it has overdrive
26 means too high resistance in the #3 injector bank, or the injector itself.
Chrysler/Dodge
Yes
Code 55 is "end of message". It just means the computer is done transmitting codes. It is not a failure.
That year Dodge should have fuel injection
The regulator in my 90 ram van is in the ECM or ECU
In the tank.
No.
autozone.com has the diagrams
1989 Dodge Ram 150/250 5 lug 5 lug 5.5 inch or 139.7mm Standard Offset
On my 91 it is under the van on the inside of the frame