My boyfriend thought he was co-signing for his sons car. Turns at they made him the primary loan holder but did not put him on the title.Does a car dealership have a legal obligation to put the primary loan holder on the title in Ohio?
No. People buy cars for other people all the time. The dealership has no obligation to figure out why your boyfriend was willing to accept a loan obligation for a car he did not own.
That said, this situation sounds about as shady as it can be. If your boyfriend entered into a different relationship with the bank than he intended to, something went badly wrong.
Disclaimer: The basis of this answer is contract law. I am not knowledgeable of Ohio legislation, but I doubt any applicable Ohio statutes significantly depart from contract law in this regard.
Does a car dealership have a legal obligation to put the primary loan holder on the title in Ohio?
Not necessarily. Before an injunction for specific performance can be entered (such as putting the loan primary holder on the title), it would have to be proved that the dealership violates/violated the covenant of good faith and fair dealing.
For instance, the dealership unreasonable refusal to make the pertinent corrections despite the mistake being its fault, that might be evidence that the dealership is violating the aforementioned covenant.