Above everything else, the issue was spiraling costs and once the project was begun
Lutz had an obligation to stop/change the project and get that back on track but he didn't.
Lutz allowed the Voltec disaster to continue because he and GM were too embarrassed to admit
that they had made a huge mistake in starting the project as a BEV with add on range extender ICE.
Keep in mind that at the time, GM was in BK and that wouldn't play well to the government overseers..
Bottom line was that instead of competing with a $21K Prius, GM planned on a $28K Volt that was better
but ended up with a $40,000 vehicle that was just too hard to sell without eating costs on super low leasing.