Trouble code P0123 indicates a problem with the throttle/pedal position sensor. When the engine control module (ECM) detects that the rated output voltage of the throttle position sensor exceeds the manufacturer's specification, it generates trouble code P0123.
The throttle position sensor (TPS) is another name for a potentiometer. It is located on the throttle body while the pedal position sensor is connected to the accelerator pedal.
The throttle position sensor monitors the movement of the accelerator pedal and determines how much power the engine requires. Code P0123 is triggered when the TPS voltage value is outside the specified range.
What are the symptoms of P0123?
- When this error appears, the Check Engine light will light up on the vehicle's dashboard. The ECM will put the engine into limp mode and stop current flowing to the throttle actuator. In this case, the opening angle of the throttle valve will be no more than 6 degrees.
- Problems may arise with the control of fuel injection and ignition timing.
- There may be a decrease in power as well as engine sensitivity to throttle opening.
- The engine may idle at higher speeds, but the vehicle will not accelerate as expected.
Note : Symptoms of this error may vary depending on the make and model of your vehicle.
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