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DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage. Object Number: 218503 Size: PAGE-WIDE Click here for detailed picture of above image. The reference voltage should be 5V. The reading at idle should be .6V. The WOT reading should be above 4.0V, but when it goes above 4.75V, the DTC gets set. A P0123 trouble code means that the PCM has recorded a reading from the TPS that exceeds the normal 4.5 volts for more than two seconds. A fault ... The P0123 code is a generic OBD-II code that indicates a problem with the Throttle Pedal Position Sensor (TPPS) or the Throttle Position Sensor ... Code P0123 may be triggered when your car computer receives a signal from the TP sensor that exceeds the maximum limit for a set period. 1. Turn the ignition key to the on (NOT start) position. 2. Press the gas pedal to the floor and HOLD for five seconds. 3. Turn the key to the " ... I hear this is an electrical issue but the voltage to the TPS is 4.95v and the ground is solid against the battery at 12.35v. 04-06 Ralliart Engine/Drivetrain - TPS sensor help!!!!! Throwing a code P0123 - So my car for the last year has been messing up. Your TPS itself is bad or the wiring and connection are bad. If you are going to replace the TPS, check the wiring and connector to the current one first. 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.