General Motors Chief Executive Mary Barra is returning to Capitol Hill on Wednesday to face intense questioning about whether the automaker has a grip on the safety crisis that has enveloped it this year, as recalls connected to ignition-switch issues continue to grow.

The No. 1 U.S. automaker has come under fire from the Justice Department, lawmakers and other authorities probing why it waited more than a decade to recall 2.6 million cars with an ignition-switch flaw that has been tied to at least 13 deaths.