Tailgate on 2019 Honda Odyssey model(s) without power lift gate function open to only a dangerously low height. Five undocumented head injuries have occured on a single vehicle within one year. Upon more research, tailgate height for these models have caused several head injuries some requiring medical attention. No warning labels or preventative equipment attached to the tailgate to warn of serious head injury. Honda dealership advised unable to adjust tailgate height.