While the initial testing will use Tesla's own fleet of cars, regular customers may be able to add their cars to the ride-hailing fleet next year, Musk says.

Tesla CEO Elon Musk told investors last year that the company was aiming for a 2025 launch of its self-driving service in California and Texas. The company appears to be on track to hit that target. Musk said during Tesla's fourth-quarter earnings call on Wednesday that the automaker is on pace to launch its self-driving service as early as June 2025,