The 14-year-old was riding a push bike when he was struck by the minibus in Toll End Road on Sunday night.
The boy remained in hospital on Wednesday morning with serious injuries, a West Midlands Police spokesman said.
Emergency services crews rushed to the scene of the incident, which unfolded at around 9.15pm on Sunday.
The minibus driver has been assisting West Midlands Police with their enquiries.
Witnesses or anyone with information can call West Midlands Police on 101, or via the force's live chat service at www.west-midlands.police.uk, quoting incident crime reference number 2482 of May 5.
Alternatively, call Crimestoppers anonymously on 0800 555111.