UNITED STATES



SECURITIES AND EXCHANGE COMMISSION



Washington, D.C. 20549



FORM 10-K



| | ☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
EXCHANGE ACT OF 1934
| | - | -------------------------------------------------------------------------------------



For the fiscal
year ended December 31, 2019



or



| | ☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d)
OF THE SECURITIES EXCHANGE ACT OF 1934
| | - | -----------------------------------------------------------------------------------------



For the transition period from
________________ to ______________________



Commission
file number of the issuing entity: 333-194765-06

CIK number of the issuing entity: 0001657146



AMERICREDIT
AUTOMOBILE RECEIVABLES TRUST 2015-4

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



Commission
File Number of depositor: 333-194765

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)



|Delaware                        |  | 47-7309827         
|------------------------------- |  | -------------------
|(State or other jurisdiction of |  | (I.R.S. Employer   
|incorporation or organization)  |  | Identification No.)



|AmeriCredit Financial Services, Inc. (as originator)
801 Cherry Street, Suite 3500
Fort Worth, TX |  | 76102     
|------------------------------------------------------------------------------------------------- |  | ----------
|(Address of principal executive offices)                                                          |  | (Zip Code)



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 every Interactive Data File required to be submitted 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 such files).



Yes ☒        No ☐



Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a non-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 Rule 12b-2 of the Exchange Act.



|Large accelerated filer ☐ | Accelerated filer ☐        
|------------------------- | ---------------------------
|Non-accelerated filer ☒   | Smaller reporting company ☐
|                          | Emerging growth company ☐  



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 Rule 12b-2 of the Act). Yes ☐         No ☒



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.


















DOCUMENTS INCORPORATED BY REFERENCE



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:



| | ITEM 1. | BUSINESS
| | ------- | --------

| | ITEM 1A. | RISK FACTORS
| | -------- | ------------

| | ITEM 2. | PROPERTIES
| | ------- | ----------

| | ITEM 3. | LEGAL PROCEEDINGS
| | ------- | -----------------



| | ITEM 1B. | UNRESOLVED STAFF COMMENTS
| | -------- | -------------------------



None.



| | ITEM 4. | MINE SAFETY DISCLOSURES
| | ------- | -----------------------



Not applicable.











PART II



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



| | ITEM 5. | MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF
EQUITY SECURITIES
| | ------- | ------------------------------------------------------------------------------------------------------------

| | ITEM 6. | SELECTED FINANCIAL DATA
| | ------- | -----------------------

| | ITEM 7. | MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
| | ------- | -------------------------------------------------------------------------------------

| | ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
| | -------- | ----------------------------------------------------------

| | ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
| | ------- | -------------------------------------------

| | ITEM 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
| | ------- | ------------------------------------------------------------------------------------

| | ITEM 9A. | CONTROLS AND PROCEDURES
| | -------- | -----------------------



| | ITEM 9B. | OTHER INFORMATION
| | -------- | -----------------



None.



PART III



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



| | ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
| | -------- | ------------------------------------------------------

| | ITEM 11. | EXECUTIVE COMPENSATION
| | -------- | ----------------------

| | ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
| | -------- | ----------------------------------------------------------------------------------------------

| | ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE
| | -------- | ------------------------------------------------------------------------

| | ITEM 14. | PRINCIPAL ACCOUNTING FEES AND SERVICES
| | -------- | --------------------------------------











PART IV



| | ITEM 15. | EXHIBITS,
                                         FINANCIAL STATEMENT SCHEDULES
| | -------- | --------------------------------------------------------------------------------



| | (a)(1) | Not
                                         applicable
| | ------ | -------------------------------------------------------

| | (2) | Not
                                         applicable
| | --- | -------------------------------------------------------

| | (3) | As
                                         reported under clause (b)
| | --- | ---------------------------------------------------------------------



(b)



|Exhibit
Number |  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|-------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.1    |  | Indenture, dated as of November 4, 2015, between AmeriCredit Automobile Receivables Trust 2015-4 and The Bank of New York Mellon, as Trustee and Trust Collateral Agent (incorporated by reference from Exhibit 4.1 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                 
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.2    |  | Amended and Restated Trust Agreement, dated as of November 4, 2015, between AFS SenSub Corp., as Seller, and Wilmington Trust Company, as Owner Trustee (incorporated by reference from Exhibit 4.2 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                                 
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.3    |  | Sale and Servicing Agreement, dated as of November 4, 2015, among AmeriCredit Automobile Receivables Trust 2015-4, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS SenSub Corp., as Seller, and The Bank of New York Mellon, as Trust Collateral Agent (incorporated by reference from Exhibit 4.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.1   |  | Purchase Agreement, dated as of November 4, 2015, between AmeriCredit Financial Services, Inc., as Seller and AFS SenSub Corp., as Purchaser (incorporated by reference from Exhibit 10.1 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                                           
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.2   |  | Lockbox Account Agreement, dated as of November 4, 2015, among JPMorgan Chase Bank, N.A., as Processor, AmeriCredit Financial Services, Inc., and The Bank of New York Mellon, as Trustee (incorporated by reference from Exhibit 10.2 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                              
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.3   |  | Lockbox Processing Agreement, dated as of November 4, 2015, among AmeriCredit Financial Services, Inc., The Bank of New York Mellon, as Trustee, and Regulus Group II LLC, as Processor (incorporated by reference from Exhibit 10.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 31.1   |  | Rule 13a-14(a)/15d-14(a) Certification (Section 302 Certification).                                                                                                                                                                                                                                                                                                                                                                                                         
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 33.1   |  | Management’s Assertion Regarding Compliance with Applicable Servicing Criteria concerning servicing activities of AmeriCredit Financial Services, Inc. and its subsidiaries for the year ended December 31, 2019.                                                                                                                                                                                                                                                           
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 33.2   |  | Assessment of Compliance with Applicable Servicing Criteria (The Bank of New York Mellon).                                                                                                                                                                                                                                                                                                                                                                                  
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 34.1   |  | Report of Independent Registered Public Accounting Firm (Ernst & Young LLP).                                                                                                                                                                                                                                                                                                                                                                                                
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 34.2   |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                                                                                                                                                                                                                                                                                         
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 35.1   |  | Servicer Compliance Statement of AmeriCredit Financial Services, Inc.                                                                                                                                                                                                                                                                                                                                                                                                       



| | (c) | Not
                                         applicable.
| | --- | --------------------------------------------------------













| | ITEM
                                         16. | FORM
                                         10-K SUMMARY
| | ------------------------------------------------- | ----------------------------------------------------------



None.



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



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



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 DERIVATIVE 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 INSTRUMENTS (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 the sponsor cannot confidently predict 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 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 on Form 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.



|Exhibit Number |  | Description                                                                                                                                                                                                      
|-------------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|               |  |                                                                                                                                                                                                                  
|Exhibit 33.1   |  | Management’s Assertion Regarding Compliance with Applicable Servicing Criteria concerning servicing activities of AmeriCredit Financial Services, Inc. and its subsidiaries for the year ended December 31, 2019.
|               |  |                                                                                                                                                                                                                  
|Exhibit 33.2   |  | Assessment of Compliance with Applicable Servicing Criteria (The Bank of New York Mellon).                                                                                                                       
|               |  |                                                                                                                                                                                                                  
|Exhibit 34.1   |  | Report of Independent Registered Public Accounting Firm (Ernst & Young LLP).                                                                                                                                     
|               |  |                                                                                                                                                                                                                  
|Exhibit 34.2   |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                              



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.



|Exhibit Number |  | Description                                                          
|-------------- |  | ---------------------------------------------------------------------
|               |  |                                                                      
|Exhibit 35.1   |  | Servicer Compliance Statement of AmeriCredit Financial Services, Inc.













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.



| | By: | AFS SENSUB CORP., | 
| | --- | ----------------- | 
| |     | as Depositor      | 





| | By: | /s/ Susan B. Sheffield                                      | 
| | --- | ----------------------------------------------------------- | 
| |     | Name: Susan B. Sheffield                                    | 
| |     | Title: Executive Vice President and Chief Financial Officer | 
| |     | Dated: March 6, 2020                                        | 



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.