Transportation officials and engineers with NASA say two mechanical safety defects previously identified by the government - sticking accelerator pedals and gas pedals that can become trapped in floor mats - are the only known causes for the reports of runaway Toyotas. Both issues were the subject of large recalls by Toyota.
Transportation Secretary Ray LaHood says the department's 10-month study has concluded there is no electronic-based cause of unintended high-speed acceleration in Toyotas.
Toyota has recalled more than 12 million vehicles globally since fall 2009 for a series of safety issues. The company has denied that electronics are to blame.