The rear powered liftgate on a 2014 Buick Enclave unexpectedly fell without warning while the vehicle was parked and the liftgate was fully open. The liftgate suddenly closed and struck the operator on the head. There were no warning lights, messages, or prior indications of a malfunction before the incident. The impact caused a concussion that required emergency medical evaluation, including a CT scan and follow-up neurological care. The incident occurred during normal use of the vehicle while loading items into the rear cargo area. The liftgate system has not been repaired and remains available for inspection. The component currently appears to operate normally, and the malfunction has not been reproduced since the incident. No prior symptoms or warnings were observed before the failure. The sudden closure of a powered liftgate presents a safety risk because it can strike occupants standing beneath it, including adults or children loading cargo. The vehicle and liftgate system have not been inspected by a dealership or manufacturer since the incident.