Cruise, the driverless car subsidiary of General Motors, said in a report on Thursday that an adversarial approach taken by its top executives toward regulators had led to a cascade of events that ended with a nationwide suspension of Cruise’s fleet.

The roughly 100-page report was compiled by a law firm that Cruise hired to investigate whether its executives had misled California regulators about an October crash in San Francisco in which a Cruise vehicle dragged a woman 20 feet. The investigation found that while the executives had not intentionally misled state officials, they had failed to explain key details about the incident.

In a meeting with regulators, the executives let a video of the crash “speak for itself” rather than fully explain how one of its vehicles severely injured the pedestrian. The executives later fixated on protecting Cruise’s reputation rather than giving a full account of the accident to the public and media, according to the report, which was written by the Quinn Emanuel Urquhart & Sullivan law firm.

The report is central to Cruise’s efforts to regain the public’s trust and eventually restart its business. Cruise has been largely shut down since October, when the California Department of Motor Vehicles suspended its license to operate because its vehicles were unsafe. It responded by pulling its driverless cars off the road across the country, laying off a quarter of its staff and replacing Kyle Vogt, its co-founder and chief executive, who resigned in November, with new leaders.