P1121 Chevrolet Electric Throttle Control Actuator

Possible causes

– Faulty Electric Throttle Control Actuator
– Electric Throttle Control Actuator harness is open or shorted
– Electric Throttle Control Actuator circuit poor electrical connection

What about the obd code?

Electric throttle control actuator does not function properly due to the return spring malfunction or throttle valve is stuck open

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– No throttle pedal response

P1121 Chevrolet Description

Electric Throttle Control Actuator consists of throttle control motor, Throttle Position Sensor (TPS), etc. The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.

The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds 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.