GM CEO Testifying on Capitol Hill

gm(CNN) — The General Motors CEO Mary Barra heads back to Capitol Hill Wednesday. She will be testifying on the company’s internal investigation of an ignition switch defect linked to 13 deaths.

The report found GM failed to understand the potential danger and blamed a corporate culture that discouraged the flow of bad news. GM knew of the problem for over a decade before issuing a recall in February.

The automaker has recalled more than 20 million vehicles in 2014 alone.