The contact owns a 2017 Honda Pilot. The contact stated while driving at approximately 65 MPH, the check engine warning light illuminated, and the vehicle started to lose motive power. The contact was able to pull over to the shoulder of the highway and stop the vehicle. The contact turned off and restarted the vehicle several times and was able to regain vehicle functionality however, the vehicle was unable to accelerate above 40 MPH. The vehicle was taken to a local dealer to be diagnosed. The dealer retrieved DTC: P2638 (Throttle body). The dealer determined that the engine was damaged and needed to be replaced. The vehicle was not repaired. The vehicle was taken back to the residence. The contact stated that while starting the vehicle, there was an abnormal knocking sound coming from the engine compartment. The contact stated that the sound was a metal-on-metal knocking sound. The manufacturer was informed of the failure. The failure mileage was approximately 157,000.