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P0120 - Throttle/Pedal Position Sensor/Switch 'A' Circuit

Possible causes
- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection
What does this mean? What does this mean?
When is the code detected?
Malfunction is detected when an excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0120 Description

The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.

Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

P0120 Information for specific makes
P0120 AUDI Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 BUICK Throttle Position Sensor 1 Circuit
P0120 CADILLAC Throttle Position Sensor 1 Circuit
P0120 CHEVROLET Throttle Position Sensor 1 Circuit
P0120 CHRYSLER Electronic Throttle Control Motor Performance
P0120 DODGE Electronic Throttle Control Motor Performance
P0120 GMC Throttle Position Sensor 1 Circuit
P0120 HYUNDAI Throttle/Pedal Position Sensor/Switch 'A' Circuit
P0120 INFINITI Throttle Position Sensor Signal Range/Performance
P0120 ISUZU Throttle Position Sensor 1 Circuit
P0120 JEEP Electronic Throttle Control Motor Performance
P0120 LEXUS Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 MAZDA Throttle Position Sensor Signal Out of Range
P0120 MERCEDES-BENZ Throttle/Petal Position Sensor/Switch A Circuit Malfunction
P0120 MITSUBISHI Throttle Position Sensor Circuit Malfunction
P0120 NISSAN Throttle Position Sensor Signal Range/Performance
P0120 PONTIAC Throttle Position Sensor 1 Circuit
P0120 SATURN Throttle Position Sensor 1 Circuit
P0120 SCION Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 TOYOTA Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 VOLKSWAGEN Throttle Pedal Position Sensor/Switch 'A' Circuit
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