It is called a APPS accelerator pedal position sensor. It is located on the front of the engine. It is the part that the throttle cables hook to.
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the code P0123 means, Throttle Position Sensor/Switch A Circuit High Input. sounds like a wiring problem to me. I had the same problem with a 99 Toyota tocoma when i replaced it i had to reset the CPU. On a dodge you should be able to disconnect both batteries for 15 mins to 1 hour and it mite reset.
Remove your air cleaner assembly, and the TPS is mounted on the throttle body, on the left if looking from the front of the truck, it will have an electrical plug on it, and I believe it has 3 screws holding it on.
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Depends on what the transmission is. Bear in mind that Cummins engines can be found in 3/4 ton Dodge pickups and semi trucks alike.