They failed to change it and it takes 3 years to change a corp. culture.
That takes leadership and a consistent leader, they kept playing musical chairs with their CEO's and what was their vision?
Now compare that with Ford and Mulally's "One Ford" vision, and their results...
GM has a culture ingrained for nearly a century it won’t ever change until it has no choice the bailout gave it a choice so it once again did not and will not change