UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2014.

OR

For the transition period from                      to                     .

Commission file number of the issuing entity: 333-170231-10

AMERICREDIT AUTOMOBILE RECEIVABLES TRUST 2013-1

(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-170231

AFS SENSUB CORP.

(Exact name of depositor as specified in its charter)

Commission File Number of sponsor: 001-13329

AMERICREDIT FINANCIAL SERVICES, INC.

(Exact name of sponsor as specified in its charter)

Registrant’s telephone number, including area code (817) 302-7000

Securities Registered Pursuant to Section 12 (b) of the Securities Exchange Act of 1934: None

Securities Registered Pursuant to Section 12 (g) of the Securities Exchange Act of 1934: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ¨    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,”” accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter.

Not applicable to this registrant

List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g.; Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980).

None.

PART I

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

None.

PART II

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

None.

PART III

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

PART IV

(a)(1) Not Applicable

(a)(2) Not Applicable

(a)(3) As reported under clause (b)

(c) Not Applicable.

SUBSTITUTE INFORMATION INCLUDED IN ACCORDANCE WITH GENERAL INSTRUCTION J TO
FORM 10-K:

ITEM 1112(b) OF REGULATION AB. (SIGNIFICANT OBLIGORS OF POOL ASSETS)

There is no single obligor that represents more than 10% of the pool assets.

ITEM 1114(b)(2) OF REGULATION AB. (CREDIT ENHANCEMENT AND OTHER SUPPORT, EXCEPT FOR CERTAIN DERIVATIVES INSTRUMENTS (FINANCIAL INFORMATION))

There is no external credit enhancement or other support provider that is liable to provide payments supporting any notes or certificates issued by the Issuing Entity.

ITEM 1115(b) OF REGULATION AB. (CERTAIN DERIVATIVE INFORMATION (FINANCIAL INFORMATION))

No entity provides any derivative instruments that are used to alter the payment characteristics of the cash flows from the Issuing Entity.

ITEM 1117 OF REGULATION AB. (LEGAL PROCEEDINGS)

General Motors Financial Company, Inc. (the “Company”), the ultimate parent of the registrant, has been served with investigative subpoenas to produce documents from state attorneys general and other governmental offices relating to its sub-prime auto finance business and securitization of sub-prime auto loans. In addition, the Company received a document request from the Securities and Exchange Commission in connection with its investigation into certain practices in sub-prime auto loan securitization. The Company is investigating these matters internally and believes the Company is cooperating with all requests. Such investigations could in the future result in the imposition of damages, fines or civil or criminal claims and/or penalties.

On November 24, 2014, a group of investors filed a civil complaint against multiple trustees in the United States District Court for the Southern District of New York, purportedly on behalf of and for the benefit of certain residential mortgage backed securities (RMBS) trusts. These filings assert claims for alleged failure by the trustees to enforce repurchase obligations of mortgage loan sellers for purported breaches of representations and warranties, to notify investors of alleged events of default purportedly caused by breaches by mortgage loan servicers and failure to abide by appropriate standards of care following alleged events of default.

ITEM 1119 OF REGULATION AB. (AFFILIATIONS AND CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS)

AmeriCredit Financial Services Inc., the Sponsor and the servicer, is a Delaware corporation and is the originator of 100% of the automobile loan contracts. The Sponsor purchases automobile loan contracts that are originated and assigned to it by automobile dealers and, to a lesser extent, third-party lenders and also originates automobile loan contracts directly with consumers, either directly or through a wholly-owned subsidiary. The Sponsor services all automobile loan contracts that it purchases or originates on behalf of the Issuing Entity, AmeriCredit Automobile Receivables Trust 2013-1, a Delaware statutory trust.

The Sponsor sold and assigned the pool of initial automobile loan contracts to AFS SenSub Corp., the Depositor, a Nevada corporation. The Depositor then sold the pool of sub-prime automobile loan contracts to the Issuing Entity and is the sole owner of the certificate of the Issuing Entity.

General Motors Financial of Canada, Ltd., or GMF of Canada, is a wholly-owned subsidiary of the Sponsor. GMF of Canada services a portion of the automobile loan contracts in the United States on behalf of the Issuing Entity through its service center in Peterborough, Ontario. GMF of Canada utilizes the Sponsor’s standardized servicing policies and procedures and operates on the same single, unified and interconnected software platform that the Sponsor’s other servicing centers utilize. GMF of Canada is managed by the same executive officers of the Sponsor that oversee the rest of the Sponsor’s operations, including servicing through its other servicing centers. GMF of Canada is operated as a separate legal entity from the Sponsor due solely to the location of its servicing center in a foreign jurisdiction, despite being operated identically to the Sponsor’s other servicing centers and not as a stand-alone entity (other than as is required for regulatory and corporate governance purposes).

ITEM 1122 OF REGULATION AB. COMPLIANCE WITH APPLICABLE SERVICING CRITERIA.

The following documents are filed as part of this report.

The Servicer has complied, in all material respects, with the Applicable Servicing Criteria.

ITEM 1123 OF REGULATION AB, SERVICER COMPLIANCE STATEMENT

The following documents are filed as part of this report.

SIGNATURES

Pursuant to the requirements of Section 13 or 15 (d) of the Securities Exchange Act of 1934, AmeriCredit Automobile Receivables Trust 2013-1 has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Supplemental information to be Furnished With Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act.

No annual report, proxy statement, form of proxy or other proxy soliciting material has been sent to certificateholders, and the registrant does not presently contemplate sending any such materials subsequent to the filing of this report.

EXHIBIT INDEX

AMERICREDIT AUTOMOBILE RECEIVABLES TRUST 2013-1