Tesla sales plunged by more than half last month in several European countries in a sign that Elon Musk could struggle to revive the company after he shifts from his Washington cost-cutting work to day-to-day operations again.

On Tesla's recent earnings call, Musk not only reaffirmed the company's plan to launch a robotaxi network in Austin in June, but he also said that robotaxis would "move the financial needle in a significant way" by the middle of next year or the second half of next year.