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

What Does P0120 Mean?

OBD-II Code P0120 is defined as a Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction
The Throttle Position Sensor/Switch is located on the Throttle Body of the Intake Manifold and the Pedal Position Sensor/Switch is part of the Accelerator Pedal assembly. These sensors provide precise input from the driver's foot in terms of how MUCH power is needed from the engine and, how URGENTLY power is needed. As the Throttle Position Sensor is rotated from its base resting position to full acceleration, typically, it sends an increasing voltage signal to the Powertrain Control Module (PCM). This increasing or decreasing voltage signal is used by the PCM to manage the Air Fuel Ratio and Spark Timing of the engine as well as other Emissions System Components.

The Pedal Position Sensor is used on vehicles equipped with an Electronic Throttle Body or "Drive by Wire" system. In these systems, the Pedal Position Sensor translates the movement of the driver's foot into a falling or rising voltage that is sent to the PCM. This changing voltage signal is used by the PCM to control the opening or closing of the Electronic Throttle Body, the Air Fuel Ratio, the Ignition Spark Timing, and other Emissions System Components. In a "Drive by Wire" system, the Throttle Position Sensor (the one mounted on the Throttle Body) is used to send a feedback voltage that verifies whether or not the desired Throttle Body opening has been attained.

When the throttle/pedal sensor/switch "A" circuit malfunctions, code P0120 is triggered.

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What are the common causes of P0120 ?

To sum things up, the common causes for code P0120 are as follows:

• TPS sensor is faulty
• TPS circuit is open or shorted
• The PCM is faulty

What are the symptoms of P0120 ?

Potential symptoms include:

• MIL (Malfunction Indicator Lamp) illumination
• Misfiring at idle or at highway speed
• Poor idle quality
• Possibly won't idle
• Possibly starts and stalls

How do you troubleshoot P0120 ?

• Repairing or replacing the TPS connector
• Repairing the wiring as necessary
• Replacing the TPS with a new sensor

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