The recall affects the 2009-2010 RAV4, the 2009-2010 Corolla, the 2009-2010 Matrix, the 2005-2010 Avalon, the 2007-2010 Camry, the 2010 Highlander, the 2007-2010 Tundra and the 2008-2010 Sequoia.
The latest move comes just months after Toyota Motor Corp. recalled 4.2 million vehicles over concerns that accelerator pedals could become lodged under floor mats, causing sudden acceleration. That problem was blamed for several crashes, including an accident involving a Lexus that accelerated to more than 120 mph before crashing in San Diego, killing four people.
But Toyota said this recall is due to problems with the actual gas pedal mechanism, causing the accelerator to become stuck regardless of whether the vehicle contains a floor mat. Toyota said in certain rare cases, the gas pedal mechanism wears down, causing the accelerator to become harder to press, slower to return or, in some cases, stuck.
In a letter to federal safety officials dated Thursday, Toyota said the problem appeared to be related to the potential build-up of condensation on sliding surfaces in the accelerator system that helps drivers push down or release the gas pedal.
Toyota spokesman Brian Lyons said the automaker does not yet have a solution to the latest problem but is working to develop one.
The National Highway Traffic Safety Administration said in a statement that the problem is "a serious safety issue and we are pleased Toyota is taking immediate action to address it."
The safety stumbles have dinged Toyota's reputation in the U.S. as a builder of dependable, high-quality cars. Last year's recall was the sixth-largest ever in the United States.