The contact owns a 2017 Chevrolet Volt. The contact stated that while driving approximately 50 MPH, the "Propulsion Power Reduced" and "Shift to Park" messages were intermittently displayed on the instrument panel. The vehicle lost automotive power and stalled, and the contact pulled over to the shoulder to avoid a crash. The failure had occurred on several occasions. The contact sustained emotional distress from the failure. The vehicle was towed back to the residence and then towed to a dealer to be diagnosed, and it was determined that the battery needed to be replaced. The vehicle was towed to an independent mechanic to be diagnosed, and it was determined that the battery energy control module needed to be replaced. The manufacturer was notified of the failure. The failure mileage was approximately 43,000.