Accelerator Pedal Position Sensor

Signs Of A Faulty Accelerator Pedal Position Sensor

The accelerator pedal position (APP) sensor, also called an accelerator pedal sensor or APP sensor, is a vital part of modern vehicles equipped with electronic throttle control or "drive-by-wire" systems. An accelerator pedal sensor translates the accelerator pedal's position into a voltage signal that informs the engine control module (ECM) that the driver intends to open the throttle body for acceleration. This signal helps the ECM determine the appropriate amount to open the throttle plate, which directly affects the amount of air and fuel that enter the engine's combustion chambers. In most cases, the pedal position sensor uses a potentiometer or Hall effect sensor to ensure accurate and precise position data proper engine performance, improved emissions, reduced fuel consumption, and increased vehicle control. APP sensors are usually located near the accelerator pedal assembly, under the dashboard, or in some larger vehicles, may be found on the floorboard or firewall. Pedal position sensors may fail with use, or due to corrosion or other severe damage to the component. This can cause issues with the air-fuel mixture and reduced performance. Symptoms of a failing or damaged accelerator pedal position sensor include a decrease in fuel efficiency or engine performance, stalling, a rough idle, a lack of response when you press the accelerator pedal, reduced power, increased fuel consumption, as well as an illuminated Check Engine light. Incorrect signals from the APP sensor may also lead to transmission issues, so be sure to address these symptoms promptly, as a failing accelerator pedal sensor can impact the vehicle's performance, safety, and emissions. If you don't feel comfortable diagnosing a car's electrical system, O'Reilly Auto Parts can recommend a professional shop near you to help restore your vehicle's performance. We also carry the diagnostic tools you may need to complete your repairs or take advantage of our free Check Engine light diagnostic service. Restore optimal power and responsiveness from your vehicle with the right accelerator pedal position sensor, as well as other parts, tools, and resources from the Parts Professionals at O'Reilly Auto Parts.