The contact owns a 2012 Hyundai Sonata. The contact stated that the rear taillights failed to illuminate upon depression of the brake pedal. There was no warning light illuminated. The contact had taken the vehicle to a dealer where she was informed that the socket to replace the light bulb had melted and that due to the failure, both light bulbs could not be replaced. The contact also mentioned that a white smoke had emitted from her driver side headlight when she attempted to replace the light bulb. The contact was able to replace the driver side headlight bulb; however, the driver side headlight bulb would illuminate very dim. The manufacturer had yet to be notified of the failure. The vehicle had yet to be repaired. The failure mileage was approximately 160,000.