Testifying before the House Energy and Commerce Subcommittee on Oversight and Investigations Tuesday, General Motors CEO Mary Barra vowed in her opening statement to “find out” why there was a long delay before the company announced a safety defect.

“Sitting here today, I cannot tell you why it took so long for a safety defect to be announced for this program,” Barra said. “But I can tell you we will find out.”