The contact owns a 2015 Ford Escape. The contact stated that while her mother was driving at an undisclosed speed, the vehicle failed to accelerate as intended while the accelerator pedal was depressed. In addition, the contact stated that her mother smelled an abnormal burning odor coming from the vehicle. No warning light was illuminated. The vehicle was towed to a local dealer where it was diagnosed and determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 90,000.