Mechanical Issues:
* Foreign object trapped under the pedal: This is the most common cause. Something like a piece of rubber matting, a dropped item, or even debris can become lodged under the pedal, preventing it from returning to its resting position.
* Broken or damaged return spring: The spring is responsible for pulling the pedal back up. If it's broken or weakened, the pedal won't return after being depressed.
* Binding linkage: The linkage connecting the pedal to the throttle body can become rusty, seized, or otherwise obstructed, preventing smooth movement. This is more common in older vehicles.
* Worn or damaged throttle cable (older vehicles): In vehicles with throttle cables (less common in modern cars), a frayed, broken, or binding cable can prevent the throttle from closing.
* Debris in the throttle body: Although less likely to cause a *completely* stuck pedal, debris in the throttle body can cause it to stick slightly open, leading to unintended acceleration.
Electronic Issues (more common in modern vehicles):
* Throttle position sensor (TPS) malfunction: The TPS tells the engine control unit (ECU) the position of the throttle. A faulty TPS might send an incorrect signal, leading to continuous fuel injection even if the pedal isn't fully depressed. This is often accompanied by a check engine light.
* Electronic throttle control (ETC) system malfunction: Modern vehicles use ETC systems, where a motor controls the throttle plate instead of a cable. A malfunction in the ETC system, including the motor, sensors, or wiring, could result in a stuck throttle. This often triggers a check engine light and other warning indicators.
* ECU malfunction: In rare cases, a problem with the ECU itself could cause it to incorrectly command the throttle to remain open.
Important Note: A stuck gas pedal is extremely dangerous. If this happens, try to safely bring the vehicle to a stop. Prioritize your safety and the safety of others. Do not attempt to repair the issue while driving. Once the vehicle is stopped, have it inspected by a qualified mechanic as soon as possible.
