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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 ... Usually if the TPS or APPS has issues it throws the 2121 or 2122. The TPS has two circuits. One is the 5 volt for actual position to control the RPM. P0123 points to a Throttle Position Sensor voltage problem. Type P0123 into the search bar. There are several threads to peruse. P0123 is for sensor 1. None of this has anything to do with the gas pedal. Check for a 5v reference to the throttle body. If you got that, then ... 2 Answers 2 ... As a follow up, I took the car in to my mechanic and he was able to diagnose that the problem was actually the crankshaft position ... Code P0123 TPS sensor ... Have you tried disconnecting the TPS sensor connector and checking to see if it's clean and tight? It's a quick start ... The ODBII code P0123 indicates that the Throttle Position Sensor (TPS) is sending a high voltage signal to the engine control module (ECM), ... P0123 Throttle Position Sensor ... Unplugged throttle body while replacing valve cover gaskets. Broke one of the tabs on the connector. Now I get ... The P0123 CEL description TPS/APP Circuit High and Throttle Position Sensor 1 Circuit High; which I read as meaning the same thing... I would ... Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here - Throttle Position Sensor/P0123 - After noticing some rough shifting ...