Nope. The check will come back as "counterfeit" or "fictitious", not "forged" (unless you DID
), so I can't see any issues there. You (referring to the order of liability in my previous post) will liable according to Civil Law, not Criminal and as long as your girlfriend is able to clear her account should this cause a negative balance, I'm sure there will be no backlash, only a lesson learned the hard way.
In these types of cases, the vehicle rarely (if ever) changes hands. I'm glad you didn't lose your snowmobile AND the money.
Good luck the rest of the way.