Dan Ammann, Chief Executive Officer of General MotorsGM has announced that Cruise, the autonomous vehicle branch, will be leaving the company.

After hours, shares of GM fell by 4.5%

The company announced that Cruise’s CTO and President Kyle Vogt would take the role of interim CEO. Vogt was previously the CEO of Cruise and co-founded the company.

Cruise will also gain a former Chairman and CEO at Northrop Grumman, Wesley Bush. He is also a GM board participant.

GM announced that the company is making a leadership shift and plans to speed up a strategy it presented at its recent Investor Day. Cruise played a crucial role in developing its autonomous vehicle platform.

At its October investor event, the company claimed that it was unable to provide any further information. aiming to grow a fleet of at least 1 million self-driving vehicles by 2030.

Cruise started seeking approval for the final commercialization of its San Francisco-based robotaxi fleet. In doing so, it became the first company in California to have a vehicle fleet without human drivers. The company currently has a fleet of Chevrolet Bolt electric vehicles that have been retrofitted to include self-driving vehicle software, radars, lidar and other technologies.

Ammann is credited with the purchase of Cruise in 2016. He was previously President at GM. In late 2018, he was appointed CEO of Cruise.

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This report was written by Michael Wayland of CNBC.