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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-188381, 333-208784, 333-227169 and 333-232402) and Form S-8 (Nos. 333-184884, 333-204129, 333-228267 and 333-238613) of ClearSign Technologies Corporation of our report dated March 31, 2021 relating to the consolidated financial statements, which appear in this Annual Report on Form 10-K.

/s/ BPM LLP

March 31, 2022

Santa Monica, California

bpmcpa.com