The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated while driving at various speeds, the vehicle slowly start to lose motive power. There was smoke coming from the engine compartment. The contact stated that the check engine warning light was illuminated. The contact then received notification of NHTSA campaign number: 20V746000 (Engine). The vehicle was then taken to the local dealer where it was diagnosed with the engine needing to be replaced. The dealer stated that they could not service the recall until the engine had failed. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 72,000.