TL* THE CONTACT OWNS A 2011 BUICK ENCLAVE. THE CONTACT STATED THAT THE TAILGATE OF THE VEHICLE CLOSED INDEPENDENTLY. THE CONTACT SUSTAINED A HEAD INJURY THAT DID NOT REQUIRE MEDICAL ATTENTION. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER:15V415000 (STRUCTURE); HOWEVER, THE PART TO DO THE REPAIR WAS UNAVAILABLE. THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 109,000.