One problem related to engine rattling and whining sounds has been reported for the 2012 Hyundai Sonata Hybrid. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Hyundai Sonata Hybrid based on all problems reported for the 2012 Sonata Hybrid.
The contact owns a 2012 Hyundai Sonata Hybrid. While driving 70 mph, the vehicle made a loud rattling noise. The contact pulled over to the shoulder of the highway. The vehicle was towed to a dealer where it was determined that a piston rod blew out and the motor needed to be replaced. The manufacturer was made aware of the issue. The failure mileage was 68,000.