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

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P0120 Possible Causes

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

First diagnose P0120 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P0120 code

    Labor: 1.0

    The cost of diagnosing the P0120 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0120 code detected?

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

P0120 Possible Symptoms

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

P0120 Meaning

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.

OBDII Code P0120 - Throttle/Pedal Position Sensor/Switch 'A' Circuit - Engine-Codes.com

P0120 More Information

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