I think it's more than the corporate culture although the corporate culture is also associated with the development of a committee hierarchy that produced the insulated silos at GM. I lived in the Detroit area for many years - did not work in the auto industry - and it was well known that at GM any decision required working through interminable committees to get an action decision. This is clearly the case with the ignition switch/air bag situation discussed in the report.
One of the conclusions in the report was that no one at GM knew completely how their cars worked. It appears that the department responsible for keyed locks was asked to design an ignition switch that used a printed circuit board for low voltage/current control of its output. It looks like it would have four output signals: one for off, one for accessory one for run, and one for crank-and-start. The switch output would go to a computer that decided what to do in each case, i.e., in run, keep the engine running, allow some lights to turn on, energize the air bag detectors, etc., in accessory, turn off the airbags, let the radio work, etc. The engineers, however, didn't know what the four signals actually controlled since the computer group was in a different department and the computer was obtained and programmed by Siemens. There was a wall between the two departments. Furthermore, another wall/delay was established because GM could only read very basic stuff from the computer and had to send the devices to Siemens after an accident to get significant output data. And there were two versions of the computer software, one for the Cobalt and one for some Saturns that stored less data even though both use the same ignition switch. This siloing of engineering responsibility prevented understanding what and how the device in one part of a car was controlling a device in another part of the car. Was it corporate culture that insulated the two groups from understanding the interaction between the parts made by each? Maybe. Corporate culture is surely responsible for never taking responsibility for any work you did or decisions you made, i.e., pass the buck.