Ford will recall nearly three-quarters of a million vehicles in the United States. A transmission defect may let cars roll away without any action from the driver. The NHTSA says this is a serious hazard. Drivers could lose control even when they do nothing. Ford will send letters to owners how to fix the issue. No accidents have been tied to this fault so far. The recall does not cover all Ford models. Only certain vehicles with this transmission flaw are included. Ford has not given a repair time. Dealers will check and fix the problem for free. Owners should watch their mail to see if their car is affected.