Stellantis, the maker of Chrysler, Jeep, Fiat and Peugeot among other brands, announced Sunday that embattled CEO Carlos Tavares has resigned due to differences with the board and in the face of disappointing sales and calls for his ouster.

After serving as CEO of Stellantis for nearly four years, Carlos Tavares is resigning from his role with the automotive manufacturing company. According to a release from the company, Tavares' resignation was accepted by the Company’s Board of Directors and is effective immediately.