The recall affects 215,000 Sonata midsize sedans from the 2006 to 2010 model years and 24,000 Azera full-size sedans from 2006 to 2011.
Hyundai says salt can corrode the rear suspension crossmember, which is part of the vehicle's frame. In advanced cases, the crossmember could detach from the control arms that lead to the wheels, which could affect wheel alignment and increase the risk of a crash.
Hyundai will inform owners next month. Dealers will inspect the cars and repair or replace the defective parts.
The recall affects vehicles registered in Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Wisconsin, Delaware and Washington, D.C.
Hyundai is also recalling about 23,000 SUVs in the U.S. and Canada because an axle can fail, causing the car to lose power.
The recall affects 2013 Santa Fe Sport models with front-wheel-drive and 2.4-liter, four-cylinder engines. They were built between July 11, 2012 through March 12 of this year.
Hyundai says the right axle shaft can fail in rare cases. If that happens, the SUVs can lose power or roll away if parked on a slope. The company says it's not aware of any crashes or injuries linked to the defect.
Owners are being notified by letter. Dealers will replace the axle shaft free of charge.