DTC P0123 - TP SENSOR CIRCUIT HIGH VOLTAGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Throttle Position (TP) sensor measures amount of throttle opening. VCM uses TP sensor information for fuel delivery calculations. TP sensor readings during acceleration are much higher than those during deceleration or idle.

Conditions for setting DTC

1. Engine running.
2. TP sensor signal voltage is greater than 4.7 volts.