Most whiplash injuries are minor to moderate, and involve days, weeks or months of discomfort. But rehabilitation and recovery are generally possible. But in the most severe car accidents, it is possible for a whiplash injury to be fatal.
If a car is struck at high enough speed, extreme whiplash can result. This might lead to the cervical bone to fracture. This bone protects your spinal cord and is connected to the part of the brain that runs your heart beat and breathing. So, if the crash is severe enough, it is possible for whiplash to be fatal.