The national cost for an accelerator pedal position sensor replacement in 2023 is between $15 and $520 with an average of $314​

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National average cost of a an Accelerator Pedal Position Sensor Replacement
for popular vehicles:

Car Model

Avg. cost


What is an accelerator pedal position sensor and how does it work?

An accelerator pedal position sensor is a component of the floor pedal that you press to actuate the throttle on your engine.

On older vehicles with mechanical throttles and accelerator pedals, a cable extended from the pedal to the throttle valve. When the driver pressed on the accelerator pedal, the cable actuated the throttle valve in a similar way that a bicycle hand brake lever actuates the brake pads to squeeze the wheel. Press on the pedal, move the cable, open the throttle, and the engine RPMs accelerate.

That is no longer the case with modern vehicles that rely on drive-by-wire technology. Now, all of the messages between the accelerator pedal and the engine are sent electronically. No more cable. Instead, when you press on the pedal, the accelerator pedal position sensor detects how much it has moved. That data is converted to voltage and sent through a wire to the engine control module (ECM), and the ECM tells the throttle how much to open or close.


How do I know if my vehicle needs the accelerator pedal position sensor replaced?

The accelerator pedal position sensor is responsible for transmitting the driver’s request for more or less speed when the pedal is pressed or released. Therefore, if there is a problem with the sensor, there will likely be trouble with your engine’s response to your input. If the sensor goes bad, you might notice one or more of the following signs:

The idle speed of your engine increases without your input

Your vehicle does not respond to your input with the accelerator pedal

Engine speed is intermittent

The check engine light comes on

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How is a an Accelerator Pedal Position Sensor Replacement done?

Not to be confused with a throttle position sensor attached to the throttle body of your engine, an accelerator pedal position sensor is usually mounted adjacent to the accelerator pedal inside your vehicle. To replace the device, a technician will first disconnect the negative terminal on your battery, taking care to preserve the vehicle computer memory.

It might be necessary to remove lower dash panels for access. The pedal assembly might also need to be removed in order to install a new sensor. In general, the sensor is unplugged from the wiring harness, unfastened from its mount, replaced with a new sensor, and plugged back in. Once all components are back in place, the technician might have to reset the check engine light to remove any stored trouble codes.

Other questions customers ask

What happens when your accelerator pedal position sensor goes out?
When an accelerator pedal position sensor goes bad, you will likely notice one or more of several symptoms related to acceleration. For instance, your engine might accelerate all on its own. Or it might not accelerate at all. It might do so intermittently. The check engine light might come on, and the engine might slip into “limp mode” and accelerate only a little.
What is the difference between an accelerator pedal position sensor and a throttle position sensor?
The accelerator pedal position sensor is in place to detect where you place the accelerator pedal in order to tell the computer how much to activate the throttle. The throttle position sensor, on the other hand, is there to tell the computer how wide the throttle is open in order to adjust the air to fuel ratio properly.
What are the two types of accelerator pedal sensors?
Accelerator pedal position sensors in drive-by-wire vehicles usually come in one of two types based on how the electrical signal is transmitted inside the sensor when you press on the pedal. One type uses a potentiometer, a contact-style continuously variable unit, usually attached to the pedal, but sometimes located remotely and connected by cable to the pedal. The other is a contactless HALL sensor that allows for greater accuracy in conditions with heavy vibrations and dust.

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