Advanced Diagnostics

DTC P0123: Throttle Position (TP) Sensor A Circuit High Voltage




General Description
Throttle position (TP) sensor A is a semiconductor type, and it is attached to the throttle body and shaft to determine throttle valve position.

The throttle valve position signal from TP sensor A is transmitted to the throttle actuator control module for target position feedback control, then to the powertrain control module (PCM) as an actual throttle valve position signal.

If the signal from TP sensor A is more than the fixed value for a set period of time, the throttle actuator control module detects a malfunction and sends the malfunction data to the PCM. When the PCM receives the malfunction data from the throttle actuator control module, the PCM detects a TP sensor A malfunction and stores a DTC.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
The TP sensor A output voltage is 4.8 V or more for at least 0.2 seconds.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.