UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): December 21, 2012

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

Effective December 21, 2012, DriveTime Automotive Group, Inc. and DT Acceptance Corporation (“DTAC”), through DTAC’s wholly-owned subsidiaries, DT Warehouse, LLC (“DT Warehouse”), and DT Credit Company, LLC (“DTCC”), entered into Amendment No. 2 to the Loan and Servicing Agreement (the “Amendment”), amending the Loan and Servicing Agreement, dated December 28, 2011, by and among DT Warehouse, as Borrower, DTCC, as Servicer, Wells Fargo Bank, National Association, as Backup Servicer, Paying Agent and Securities Intermediary, the Commercial Paper Conduits from time to time party thereto, the Financial Institutions from time to time party thereto, and Deutsche Bank AG, New York Branch, as Program Agent for the Conduit Lenders and Committed Lenders (the “Loan and Servicing Agreement”).

The Amendment extends the Commitment Termination Date to December 21, 2014. The Amendment also revises the interest rate and the calculation of the Rolling Average Delinquency Ratio for Managed Portfolio Contracts, such that the calculation of Level One, Level Two and Level Three Trigger Events are more consistent with comparable calculations on other revolving debt facilities.

The foregoing description of the Amendment and the Loan and Servicing Agreement is only a summary, does not purport to be complete and is qualified in its entirety by reference to the Amendment, which will be filed as an exhibit to DTAC’s next Annual Report on Form 10-K and is incorporated herein by reference and the Loan and Servicing Agreement, which is filed as Exhibit 10.16 to Annual Report on Form 10-K for the period ended December 31, 2011 and is incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.