Possible causes

Electric throttle control actuator (TP sensor 1 and 2)

When is the code detected?

Closed throttle position learning value is excessively low.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1225 Description

Electric Throttle Control Actuator consists of throttle control motor, acceleration pedal position sensor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement.

The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

P1225 Information for specific makes

P1225 BUICK
P1225 CADILLAC
P1225 CHEVROLET
P1225 GMC