The incident happened in November, but charges were amended on Monday to include second-degree attempted murder.
It's not clear why the 14-year-old boy was driving alone.
There have been 229 deaths on state roadways so far in 2020.
It happened Friday afternoon in Aitkin County.
The snowmobiler tried to cross Hwy. 169 and was struck by a vehicle.
Separate high-speed chases took place in central Minnesota Thursday and Friday.