UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-K/A







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

For the fiscal year ended December 31, 2014.

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: 333-170231-13





AMERICREDIT AUTOMOBILE RECEIVABLES TRUST 2013-4

(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)







|                                                                                                  |  |                                    
|------------------------------------------------------------------------------------------------- |  | -----------------------------------
|Delaware                                                                                          |  | 46-6893269                         
|(State or other jurisdiction ofincorporation or organization)                                     |  | (I.R.S. employeridentification 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 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 the 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, or a
non-accelerated filer or a smaller reporting company. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                        |  |   |  |                           |  |  
|----------------------- |  | - |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈ |  | Accelerated filer         |  |  ̈
|                        |  |   | 
|Non-accelerated filer   |  | x |  | Smaller reporting company |  |  ̈

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 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.

Explanatory Note:

The Form 10-K for the issuing entitys fiscal year ended December 31, 2014 was originally filed on March 31, 2015. This Form 10-K/A is
being filed to correct an error in the Section 302 Certification and to correct an error in Managements Assertion attached to the Form 10-K as Exhibits 31.1 and 33.1. A corrected and updated Section 302 Certification and
Managements Assertion are attached to this Form 10-K/A as Exhibits 31.1 and 33.1.

Except for the updated exhibits described above, this Form 10-K/A
does not update, modify or amend any other information or any other exhibits as originally filed on the Form 10-K. Therefore, this Form 10-K/A does not reflect events occurring after the original filing date of the Form 10-K and does not update
those disclosures as affected by subsequent events. Accordingly, this Form 10-K/A should be read in conjunction with the Form 10-K and with other filings made by the issuing entity with the Securities and Exchange Commission subsequent to the filing
of the Form 10-K.

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 4.  |  | MINE SAFETY DISCLOSURES



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

None.



---

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 AND RELATED STOCKHOLDER MATTERS                
|         | 
|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 AND 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 ACCOUNTANT FEES AND SERVICES                                                        



|ITEM 15 | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|------- | ------------------------------------------

(a)(1) Not Applicable

(a)(2) Not Applicable

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



|(b) | 
|--- | 



|               |  |                                                                                                                                                                                                                                                                                                                                                                                   
|-------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit Number |  | Description                                                                                                                                                                                                                                                                                                                                                                       
|               | 
|Exhibit 4.1    |  | Indenture, dated as of August 7, 2013, between AmeriCredit Automobile Receivables Trust 2013-4 and Wells Fargo Bank, National Association, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).



---

|             |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|------------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|             | 
|Exhibit 4.2  |  | Amended and Restated Trust Agreement, dated as of August 7, 2013, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                                                            
|             | 
|Exhibit 4.3  |  | Sale and Servicing Agreement, dated as of August 7, 2013, among AmeriCredit Automobile Receivables Trust 2013-4, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS SenSub Corp., as Seller, and Wells Fargo Bank,
National Association, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21,
2013).
|             | 
|Exhibit 10.1 |  | Purchase Agreement, dated as of August 7, 2013, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                                                                      
|             | 
|Exhibit 10.2 |  | Lockbox Account Agreement, dated as of August 7, 2013, among JPMorgan Chase Bank, N.A., as Processor, AmeriCredit Financial Services, Inc., and Wells Fargo Bank, National Association, as Trustee (incorporated by reference from
Exhibit 10.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                              
|             | 
|Exhibit 10.3 |  | Lockbox Processing Agreement, dated as of August 7, 2013, among AmeriCredit Financial Services, Inc., Wells Fargo Bank, National Association, as Trustee, and Regulus Group II LLC, as Processor (incorporated by reference from Exhibit
10.4 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                
|             | 
|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, 2014.                                                                                                                                                                                                                                                                  
|             | 
|Exhibit 33.2 |  | Assessment of Compliance with Applicable Servicing Criteria (Wells Fargo Bank, National Association).                                                                                                                                                                                                                                                                                                                                                                              
|             | 
|Exhibit 34.1 |  | Report of Independent Registered Public Accounting Firm (Deloitte & Touche LLP).                                                                                                                                                                                                                                                                                                                                                                                                   
|             | 
|Exhibit 34.2 |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                                                                                                                                                                                                                                                                                                



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



|(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 subprime 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 subprime 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 2013-4, 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.



|               |  |                                                                                                                                                                                                                  
|-------------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|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, 2014.
|               | 
|Exhibit 33.2   |  | Assessment of Compliance with Applicable Servicing Criteria (Wells Fargo Bank National Association).                                                                                                             
|               | 
|Exhibit 34.1   |  | Report of Independent Registered Public Accounting Firm (Deloitte & Touche 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.

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.



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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 DepositorBy:

/s/ Chris A. ChoateName: Chris A. ChoateTitle: Executive Vice President and Chief Financial OfficerDated: June 16, 2015


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.



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EXHIBIT INDEX

AMERICREDIT AUTOMOBILE RECEIVABLES TRUST 2013-4



|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|-------------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit Number |  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|               | 
|Exhibit 4.1    |  | Indenture, dated as of August 7, 2013, between AmeriCredit Automobile Receivables Trust 2013-4 and Wells Fargo Bank, National Association, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                                 
|               | 
|Exhibit 4.2    |  | Amended and Restated Trust Agreement, dated as of August 7, 2013, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                                                            
|               | 
|Exhibit 4.3    |  | Sale and Servicing Agreement, dated as of August 7, 2013, among AmeriCredit Automobile Receivables Trust 2013-4, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS SenSub Corp., as Seller, and Wells Fargo Bank,
National Association, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21,
2013).
|               | 
|Exhibit 10.1   |  | Purchase Agreement, dated as of August 7, 2013, 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 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                                                                      
|               | 
|Exhibit 10.2   |  | Lockbox Account Agreement, dated as of August 7, 2013, among JPMorgan Chase Bank, N.A., as Processor, AmeriCredit Financial Services, Inc., and Wells Fargo Bank, National Association, as Trustee (incorporated by reference from
Exhibit 10.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                              
|               | 
|Exhibit 10.3   |  | Lockbox Processing Agreement, dated as of August 7, 2013, among AmeriCredit Financial Services, Inc., Wells Fargo Bank, National Association, as Trustee, and Regulus Group II LLC, as Processor (incorporated by reference from Exhibit
10.4 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2013-4 (File No. 333-170231-13) with the SEC on August 21, 2013).                                                                                



---

|             |  |                                                                                                                                                                                                                  
|------------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|             | 
|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, 2014.
|             | 
|Exhibit 33.2 |  | Assessment of Compliance with Applicable Servicing Criteria (Wells Fargo Bank, National Association).                                                                                                            
|             | 
|Exhibit 34.1 |  | Report of Independent Registered Public Accounting Firm (Deloitte & Touche LLP).                                                                                                                                 
|             | 
|Exhibit 34.2 |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                              
|             | 
|Exhibit 35.1 |  | Servicer Compliance Statement of AmeriCredit Financial Services, Inc.