Exhibit 23.1

Ally Financial Inc.

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference of our reports dated February 27, 2015, relating to the consolidated financial statements of Ally Financial Inc., and the effectiveness of Ally Financial Inc.’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Ally Financial Inc. for the year ended December 31, 2014, in the following registration statements on:

Form S-3:

No. 333-183535

No. 333-193070

No. 333-201057

No. 333-201205

Form S-8:

No. 333-195172

/S/ DELOITTE & TOUCHE LLP

Deloitte & Touche LLP

Detroit, Michigan

February 27, 2015