General Motors' CEO Mary Barra will tell a congressional subcommittee she won't accept "business as usual at GM" and update the committee on the automaker's progress in dealing with the ignition switch recall.

Barra is returning to Congress two months after her initial April 1 appearance when she first addressed the recalls to the House Committee on Energy and Commerce's subcommittee on oversight and investigations.

In testimony Barra submitted for the June 18 hearing, she outlines seven updates since her last appearance, including the departure of 15 employees named in the Valukas report; restructure of the safety decision-making process; and creation of a Global Product Integrity unit.

Barra will say that the Valukas report, which was generated from an internal investigation, revealed a "series of questional actions and inactions" that "were inexcusable."

Read Barra's full testimony here.