Throttle/Pedal Position Sensor A Circuit High Input
The engine computer is getting a voltage signal from the throttle or accelerator pedal sensor that is higher than expected. This usually means the sensor, wiring, or connector has a problem. It can cause poor throttle response, rough running, or reduced engine power.
You may be able to drive short distances, but throttle response can be unpredictable and the engine may go into reduced-power mode. Avoid highway driving and get the problem checked soon.
P0123 means the PCM has detected a high input condition on throttle position sensor or accelerator pedal position sensor circuit A. This usually indicates the signal voltage is above the expected range, often because of a faulty sensor, damaged wiring, poor connector contact, or a short to voltage. The vehicle may enter limp mode to protect the engine and transmission.
Yes. A failed throttle position sensor or pedal position sensor is one of the most common causes of P0123.
It can. Many vehicles reduce engine power when the throttle signal is too high or unreliable.
You can clear it, but if the fault is still present the code will return. Driving with this code can leave you with poor throttle response or reduced power.
Not always. Wiring, connectors, and the pedal sensor should be checked before replacing the throttle body.