P0120 GMC Throttle Position Sensor 1 Circuit

Possible causes

– Faulty Throttle Position Sensor
– Throttle Position Sensor circuit is open or shorted
– Throttle Position Sensor poor electrical connection

When is the obd code mean?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

Symptoms

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

P0120 GMC OBD Code Description