Ford will recall nearly three-quarters of a million vehicles in the United States. A transmission problem may let cars roll away without any action from the driver. The NHTSA says this is a major risk. Drivers could lose control even when they do nothing. Ford will mail owners how to resolve the problem. No accidents have been linked with this fault at this time. The recall does not cover every Ford vehicle. Only specific models with the defect are included. Ford has not given a timeline for fixes. Dealers will inspect and repair the problem at no cost. Owners should wait for a letter to see if their car is affected.