It happened around 2:15 Wednesday afternoon in the 1200 block of Southeast 42nd.
Police say when they arrived on scene the teen was suffering from a seizure. After being thrown from the vehicle he had hit his head on the pavement.
They say it appears he had been standing on the hood of the car while it was moving, also known as "hood surfing." He was taken to Stormont Vail.
If you have any information call Crimestoppers at 234-0007.