The condition is rare, but can occur when the pedal mechanism becomes worn and, in certain conditions, the accelerator pedal may become harder to depress, slower to return or, in the worst case, stuck in a partially depressed position.
 
In the event that a driver experiences an accelerator pedal that sticks in a partial open throttle position or returns slowly to idle position, the vehicle can be controlled with firm and steady application of the brakes. The brakes should not be pumped repeatedly as it could deplete vacuum assist, requiring stronger brake pedal pressure. This action should bring your vehicle to a stop.  The vehicle should be driven to the nearest safe location, the engine shut off and a Toyota dealer contacted for assistance.
 
You can also shift the transmission gear selector to the Neutral (N) position and use the brakes to make a controlled stop at the side of the road and turn off the engine.
  • If unable to put the vehicle in Neutral, turn the engine OFF or to ACC. This will not cause loss of steering or braking control, but the power assist to these systems will be lost.
  • If the vehicle is equipped with an Engine Start/Stop push button, firmly and steadily push the button for at least three seconds to turn off the engine. Do NOT tap the Engine Start/Stop button.
  • If the vehicle is equipped with a conventional key-ignition, turn the ignition key to the ACC position to turn off the engine. Do NOT remove the key from the ignition as this will lock the steering wheel.
 
 
Although the accelerator pedal action may return to normal, NO further attempt to drive the vehicle should be made.