TSB - SERVICE ACTION: PANORAMIC SUNROOF INSPECTION AND REPAIR (SA270) REV 1 - This bulletin provides information on some 2016MY Optima (JFa) vehicles, produced from September 28, 2015 to September 26, 2016, which may exhibit a buzzing noise that may increase with intensity in conjunction with the HVAC fan speed, a popping or clicking noise when driving over bumps or turning, and/or a loose folding cover, depending on the vehicle production date.
