global product development leaving lingering questions about what she knew when about product flaws in gm vehicles. >> i was not aware that there was this issue until the recall was introduced on january 31st. >> had gm acted differently, perhaps some of this tragedy might not -- might have been averted. >> reporter: gm says that's exactly what it's doing now, hence, the mountain of recalls. the last thing they want is to be accused of delaying another one. >> they're cleaning out their closets, going through and finding every issue that they've had in the past that maybe should have been a recall and making it a recall. >> reporter: so far fixing all those recalled cars will cost gm $1.7 billion this year and the stock is down 18% year to date, but what might be surprising is that all the recalls haven't made a dent in gm sales which were 7% higher in april than a year ago. >> what gm is doing, talking, saying we're going to be a good corporate citizen, but they've said the same thing in the past.