Oakland County Sheriff units were called to a serious injury crash on Sashabaw Road north of Stickney Road at about 3:18 a.m. on April 17.
A 17-year-old Ortonville man was taken to Genesys Regional Medical Center, where he was listed in serious, but critical condition with a head injury, reports said.
Investigators said the man was traveling north on Sashabaw when his 1994 Acura Integra left the roadway to the right, colliding with a parked vehicle.
The driver was wearing his seatbelt, and investigators believe alcohol was a factor in the crash.
Further details were not immediately available on Monday.