Advanced Diagnostics

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 a fixed value for a set 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 200 milliseconds.

Diagnosis Details

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

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.