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P0123 is not a recognized code. The translation given on your scanner's screen hints that one of the two potentiometers in the "gas" pedal has a wiring fault. The TPS (Throttle Position Sensor) is a potentiometer that is mounted to the throttle body. It detects the throttle blade angle. As the throttle blade moves, ... It states "P0123 Throttle/Petal Position Sensor/Switch A Circuit High Input." By saying that it is a high Input, that would mean that the problem cannot be the ... 1) spend 45 minutes taking things off / looking for sensor 2) open hood, see sensor 3) take 3 minutes to replace Steps with pictures! The jeep will start fine and idle for a few seconds, then the RPMs will fluctuate and eventually stall. Not too sure what would cause this though. The TPS sensor should produce around .5v at full closed throttle plate and around 4.5v with the pedal all the way down. How to quickly test and replace the throttle position sensor for your car or truck. Typical symptoms of a bad or failing TPS include: poor ... OBD-II code P0123 means that there is a high input in the Throttle/Pedal Position Sensor/Switch 'A' Circuit. This sensor provides input from ... I am getting P0123 Throttle/pedal position sensor/switch A circuit high. I have been told first thing to do is clean electrical connections at either end. P0123 code is for the Throttle Position Sensor, not the Petal sensor. Might check the connections at the throtle body on the engine or the connectors in the ...