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Exhibit 15.3

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-269756) on Form S-8, (No. 333-271861) on Form F-3 and (No. 333-283854) on Form F-3 of ECARX Holdings Inc. of our report dated March 26, 2025, with respect to the consolidated financial statements of ECARX Holdings Inc.

/s/ KPMG Huazhen LLP

Shanghai, China

March 26, 2025