A third-party investigation into General Motors' Cruise autonomous vehicle unit has revealed a web of culture issues, ineptitude, and leadership problems, which have been central to the company's regulatory troubles since October.

General Motors is suing San Francisco, alleging that the city improperly overcharged the company by more than $100 million in taxes over seven years, based on calculations that included its self-driving car subsidiary, Cruise.

Cruise, the autonomous vehicle operator, has decided to temporarily halt its fleet of driverless cars across the United States, citing a need to reassess its operations and build public trust.

The California Department of Motor Vehicles (DMV) has revoked Cruise's license to operate autonomous vehicles in San Francisco due to concerns about safety and transparency.

Cruise is a self-driving vehicle company that was acquired by General Motors (GM) in 2016. The company is developing a fleet of autonomous vehicles, known as "Cruise Robotaxis," which are designed to provide on-demand, driverless transportation services to the public.