For GM executives, the implications of the investigation go well beyond whether or not it will hurt, or potentially devastate, sales of Chevy Volt. No, the bigger issue is whether the vehicle, literally and figuratively, that GM has staked its reputation on, is going to become an embarrassing punch line for corporate failure? This is why the head of GM North America, Mark Reuss, and the head of GM Global Product Development, Mary Barra, are holding a conference call to answer questions about the Chevy Volt.