UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM10-K

For the fiscal year ended December 31, 20172018

OR

For the transition period from ________________ to ______________________

Commission file number of the issuing entity:333-206924-08

CIK number of issuing entity: 0001718362

AMERICREDIT AUTOMOBILE RECEIVABLES TRUST2017-4

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

Commission File Number of depositor:333-206924

CIK number of depositor: 0001347185

AFS SENSUB CORP.

(Exact name of depositor as specified in its charter)

Commission File Number of sponsor:001-13329

CIK number of sponsor: 0001002761

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 Act: None

Securities Registered Pursuant to Section 12 (g) of the Act: 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 ☒

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 ☒

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 ☒     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 RegulationS-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 the disclosure of delinquent filers pursuant to Item 405 of RegulationS-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 Form10-K or any amendment to this Form10-K. ☒

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, anon-accelerated filer, a smaller reporting company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Act). Yes ☐      No ☒

State the aggregate market value of the voting andnon-voting common equity held bynon-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.

DOCUMENTS INCORPORATED BY REFERENCE

List hereunder the following documents if incorporated by reference and the part of the Form10-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 Form10-K:

None.

Not Applicable.

PART II

The following Items have been omitted in accordance with General Instruction J to Form10-K:

None.

PART III

The following Items have been omitted in accordance with General Instruction J to Form10-K:

PART IV

(a)(1) Not Applicable

(a)(2) Not Applicable

(a)(3)

(b)

(c) Not Applicable.

None.

SUBSTITUTE INFORMATION INCLUDED IN ACCORDANCE WITH GENERAL INSTRUCTION J TO FORM10-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)

The sponsor is subject to various pending and potential legal and regulatory proceedings in the ordinary course of business, including litigation, arbitration, claims, investigations, examinations, subpoenas and enforcement proceedings. Some litigation against the sponsor could take the form of class actions. The outcomes of these proceedings are inherently uncertain, and thus no prediction can be confidently given on how or when these proceedings will be resolved. An adverse outcome in one or more of these proceedings could result in substantial damages, settlements, fines, penalties, diminished income or reputational harm to the sponsor, and could materially and adversely affect the interest of the noteholders or the servicer’s ability to perform its duties under the transaction documents. The proceedings identified below are those in connection with which the sponsor believes a material loss is reasonably possible or probable.

In 2014 and 2015, General Motors Financial Company, Inc. was served with investigative subpoenas from various state attorneys general and other governmental offices to produce documents and data relating to its automobile loan and lease business and securitization of loans and leases. General Motors Financial Company, Inc. believes that it has cooperated fully with all reasonable requests for information.

In the ordinary course of business, The Bank of New York Mellon is named as a defendant in or made a party to pending and potential legal actions. In connection with its role as trustee of certain residential mortgage-backed securitization, or RMBS, transactions, The Bank of New York Mellon has been named as a defendant in a number of legal actions brought by RMBS investors. These lawsuits allege that the trustee had expansive duties under the governing agreements, including the duty to investigate and pursue breach of representation and warranty claims against other parties to the RMBS transactions. While it is inherently difficult to predict the eventual outcomes of pending actions, The Bank of New York Mellon denies liability and intends to defend the litigations vigorously.

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

Information required by Item 1119 of Regulation AB has been omitted from this report onForm 10-K in reliance on the Instruction to Item 1119.

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.

The Assessment of Compliance with Applicable Servicing Criteria provided by The Bank of New York Mellon that is included in this report as Exhibit 33.2 includes references to certain Material Instances of Noncompliance by The Bank of New York Mellon. After reviewing information provided by The Bank of New York Mellon, we have ascertained that those instances of noncompliance do not relate to the transactions entered into by the issuing entity, do not relate to the same class of assets as those backing the asset-backed securities described in this report, and do not relate to activities performed by The Bank of New York Mellon pursuant to the transactions relating to the asset-backed securities described in this report.

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, AFS SenSub Corp. 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.