Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on FormS-8 (Nos.333-142475, 333-159358, 333-192928, 333-227648, 333-230532, 333-238265 and 333-249940) and the Registration Statements on Form S-3 (Nos. 333-224786 and 333-227646) of Tenneco Inc. of our report dated February 24, 2021 relating to the financial statements and financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Milwaukee, Wisconsin

February 24, 2021