P0123 — Throttle Position Sensor Circuit High Input

Throttle Position Sensor Circuit High Input. The engine computer is receiving a voltage signal from the throttle position sensor that is higher than the maximum expected limit. This usually means the sensor is sending bad data about how far the accelerator pedal or throttle valve is open.

With caution: limp mode possible, have it checked soon

Faulty throttle position sensor or accelerator pedal position sensor Damaged, corroded, or shorted wiring in the sensor harness Internal failure within the engine control module

You should have a mechanic inspect the wiring harness and connectors near the throttle body first. Drive the car as little as possible until it is checked, because unpredictable throttle response creates a serious safety risk on the road.