The sharpest fact about this product is that two federal regimes, written years apart for different reasons, draw the identical line, and a title loan is what falls on the far side of both.
The Military Lending Act's implementing regulation defines "consumer credit" and then excludes, at 32 CFR 232.3(f)(2)(ii), "Any credit transaction that is expressly intended to finance the purchase of a motor vehicle when the credit is secured by the vehicle being purchased." The CFPB's payday rule states its own exclusion at 12 CFR 1041.3(d)(1) for "Credit extended for the sole and express purpose of financing a consumer's initial purchase of a good when the credit is secured by the property being purchased," and the rule's official commentary gives a car as its first example. So a loan used to buy a car is outside both. A loan taken against a car already owned is inside both, and that is the entire regulatory identity of this product: it is the vehicle-secured loan that neither carve-out reaches.
For one group of borrowers the consequence is not a rate cap but a prohibition. 32 CFR 232.8 opens by stating that "Title 10 U.S.C. 987 makes it unlawful for any creditor to extend consumer credit to a covered borrower with respect to which" a list of things is true. Paragraph (f) is one of them: the creditor "uses the title of a vehicle as security for the obligation involving the consumer credit, provided however, that for the purposes of this paragraph, the term 'creditor' does not include a person that is chartered or licensed under Federal or State law as a bank, savings association, or credit union." A covered borrower is an active-duty servicemember or a dependent. The separate 36 percent military annual percentage rate ceiling at 32 CFR 232.4(b) is a limit on price; this is a bar on the structure, and the exception is drawn around depository institutions rather than around loan terms.
The refinancing trap is written into the rule's own commentary. The payday rule's purchase-money exclusion is explained in a comment headed "'Sole purpose' test," which ends: "This exclusion does not apply to refinances of credit extended for the purchase of a good." A borrower who refinances an existing car loan with a non-purchase lender has moved from a transaction outside the rule to one that can be inside it, on the same car, without anything about the vehicle changing.
"Motor vehicle" is a defined term and it is narrower than the ordinary word. 12 CFR 1041.2(a)(15) provides that it "means any self-propelled vehicle primarily used for on-road transportation. The term does not include motor homes, recreational vehicles, golf carts, and motor scooters." A loan against the title to a recreational vehicle is not reached by that definition, which matters because the marketing does not distinguish.
What happens if the loan is not repaid is state law, and this page will not pretend otherwise. The lender's remedy is repossession, governed by article 9 of the Uniform Commercial Code as enacted in each state, with the sale proceeds applied to the costs of taking and selling the vehicle before the debt itself. Whether a notice is owed, whether the borrower may cure, and what may be collected afterward differ from state to state. Published material on repossession covers the seizure, and what is still owed after the sale is a deficiency balance, which has its own page.