CNN The Situation Room April 1, 2014 22:46:00
>> reporter: sheri lost her 21-year-old son michael in 2012 when his chevy cobalt veered off the road and hit a rockwall. she blames a faulty ignition switch. general motors admits 13 deaths and 31 accidents are related to the switch which can turn off when bumped cutting off the airbag, brakes and power steering. >> who knew what when. that includes you. >> reporter: today lawmakers grilled gm ceo at a house hearing following a massive recall of 2.6 million vehicles tied to the ignition problem. going back to 2003 models. but the automaker admits it knew about the problem as early as 2004. sh...