The contact owns a 2011 Toyota Prius. The contact stated while driving at various speeds, the vehicle lost motive power temporarily. The contact stated that upon depressing the accelerator pedal, the vehicle continued driving; however, the vehicle was operating on gasoline. The contact related the failure to NHTSA Campaign Number: 18V684000 (Hybrid Propulsion System). The vehicle was taken to the dealer for the recall repair. The dealer determined that the hybrid battery needed to be replaced. The dealer provided an estimate for the repair. The contact declined to pay for the repair and advised the dealer to perform the recall repair; however, the dealer failed to acknowledge the recall. The vehicle was not repaired. Additionally, the contact stated while driving 25 MPH downhill, the vehicle stalled. The check engine and several unknown warning lights were illuminated. The contact was able to restart the vehicle, and the contact pulled into the driveway of the nearby residence. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 116,000.