DETROIT — US safety regulators are investigating complaints that the rear suspension frames can rust and fail on Hyundai Sonata midsize cars.
The probe affects about 393,000 cars from the 2006 through 2008 model years.
The National Highway Traffic Safety Administration said it has received six complaints of suspension failures, with three happening at highway speeds, according to documents posted on its website on Friday. The investigation was opened on March 25.
The agency said rust in the frame can cause control arm failures. A car’s wheel hubs are attached to the control arms.
No crashes or injuries were reported, but two of the failures activated the cars’ electronic stability control systems.
Hyundai said Monday that it is too early to draw conclusions about the complaints. The automaker said it is cooperating with NHTSA and will take necessary action to ensure its customers’ safety.
A Hyundai spokesman said in an e-mail that customers with issues should take their cars to a Hyundai dealer.