On XXX, I was loading items in the rear cargo area of an Avis rental vehicle, a 2025 Hyundai Palisade when the power liftgate was fully open above me, without warning and without me commanding it to close, the liftgate unexpectedly came down/fell. It struck me in the head and I lost consciousness, I don’t know how long I was unconscious. When I regained consciousness, I was in the rear cargo area of the vehicle with the liftgate on my back. I sought emergency medical treatment the same day at Chippenham Hospital in [XXX]. My records show evaluation for neck pain and headache. CT imaging of my head/brain and cervical spine , and discharge info for concussion and a pinched nerve in the neck. I subsequently received orthopedic and spine treatment and physical therapy for continuing neck, back, shoulder and knee complaints. My concern is, a fully open powered liftgate should not unexpectedly descend onto a person beneath it. I am asking NHTSA to record and evaluate this incident as a power liftgate safety defect. The vehicle was a rental from Avis on [XXX] and does not list the VIN number on my contract. I am requesting the VIN number and maintenance repair history from Avis to supplement this complaint. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)