Toyota Motor Corp. officially recalled 3.8 million vehicles in the United States on Monday to address problems with floor mats that could cause the gas pedal to stick and cause a crash.

The automaker formally informed the federal government of the recall in a letter Monday. It will be Toyota's largest U.S. recall and the country's sixth-largest recall, according to the National Highway Traffic Safety Administration.

The recall includes 2007-2010 model year Toyota Camry, 2005-2010 Toyota Avalon, 2004-2009 Toyota Prius, 2005-2010 Tacoma, 2007-2010 Toyota Tundra, 2007-2010 Lexus ES350 and 2006-2010 Lexus IS250/IS350.

Chris Santucci, Toyota's assistant manager for technical and regulatory affairs, wrote in the letter to NHTSA that there are 3.8 million vehicles involved but "this estimate is subject to change as Toyota refines the number of affected vehicles by model."

Toyota told the government it has not determined that the vehicles "contain a 'safety-related defect' within the meaning of the federal safety laws" but would notify owners of the safety campaign.