From customer comments I've heard over the last week, the whole industry is under the microscope for this one. If the worlds largest automaker isn't above such tactics, why would any other manufacturer be any different, guilt by association.
Current GM Duramax engines are prone to puffs of smoke when the particulate trap starts a regeneration cycle, I've been asked by a customer if the computer is switching over to the "test" phase in a GM computer when this happens. I wanted to tell him that when I wrote the code for the ECM I did a better job of hiding it than VW engineers did, but I still couldn't get around the puff of smoke, so I made up an excuse for it! How the hell do I know? It took the Fed's 8 years to catch on to VW's tricks.