Originally Posted by
I'mAllIn
That's basically the last stage in commercial trucks. If your DEF tank is empty and you add fuel without adding DEF, that's when you're limited to 5 mph. The thought is all the warning lights and chimes have been going off for some time and eventually you need to add fuel. Doing so and ignoring DEF level brings you to a crawl.
Right.
Presumably this system never fails or gives a false alarm.
This reeks of the seat belt ignition interlock of past where if your belt is not buckled, the car will not start.
Intrusive minders at their worse.