Hyundai Motor America is reinstating Service Campaign TT1 which provides front and rear under body corrosion prevention treatment on certain 2007-2010 Model Year Elantra vehicles in the following salt belt states: Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Wisconsin, and the District of Columbia.