Thanks for your query
You didnt mention how long back he had the accident.
What kind of injury he had ?
How much temperature rise is he having?
What are the other symptoms that he is having?
Did he have head injury
? The temperature regulation mechanism is controlled by our brain and it may be that due to brain injury
that mechanism has altered.
The other reason might be hidden infection which is causing the fever
Whatever be the cause you need to go to your doctor for a check up.Blood investigations need to be done.CT scan
of brain is to be done in case of head injury.Dont neglect.
Update here how you stay.