I am assuming you mean you added a new vehicle loan as a liability account.  Adding a new vehicle could mean the asset account.

This is a case where you want to follow the reality of the flow of money.  Where you post is not as important as knowing the journal entries.

Did the money hit your business bank account and then you paid for the vehicle from the business bank account?

In this case, yes a general journal entry would normally work here, Dr. Bank, Cr. Vehicle Loan.

Did the money go directly to the dealer for the purchase of the vehicle?

With this option, you may now have to record the purchase of the asset, sales tax, other fees that may be on the bill, then the loan liability and possibly take into consideration any deposit that may have been paid as well all as part of the same transaction.  This could be a general journal entry or done in the Purchase module depending on what detail you want as part of the entry.  If you want to record a lot of text detail, maybe the Purchase module would be best.