You could just google “CFPB dealer markups” but here:

In March 2013, the Bureau issued CFPB Bulletin 2013-02 to target dealer markups, a practice where an automobile dealer charges a consumer a higher interest rate than the rate by which an indirect lender is willing to purchase the consumer’s retail installment sales contract. The CFPB expressed concern that dealers were being allowed by the indirect lenders to exercise too much pricing discretion, opening the door to discrimination. In the Bulletin, the CFPB contended that it was “likely” to consider an indirect auto lender a “creditor” within the meaning of ECOA, if an indirect lender purchased a contract at an interest rate lower than the rate on the consumer’s contract. The Bureau also announced that it intended to use a disparate treatment or disparate impact theory to examine an indirect auto lender’s ECOA liability for prohibited pricing differences created by the dealer’s pricing activities. Under this view, indirect lenders would have liability for disparate pricing – even though they did not set the pricing and even without evidence that either the lender or the dealer intended to discriminate against anyone. The Bureau’s guidance has had considerable implications for financial institutions, as banks and lenders have seen significant increase in the cost of compliance, not to mention numerous and expensive investigations and settlements with the CFPB, banking regulators, and the U.S. Department of Justice.