EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-164032, 333-168523, 333-196668, 333-250085, 333-256782) on Form S-8 and (No. 333-253238) on Form S-3 of our report dated March 9, 2023, with respect to the consolidated financial statements of KAR Auction Services, Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Indianapolis, Indiana

March 9, 2023