It is pretty easy to fall into that trap. Customer comes in driving a subaru and says his coolant is getting gone....... shop starts replacing the head gaskets because 99 percent of the time that's the cause. Lol. Could be a hose, pump, heater etc etc. You do have to thoroughly investigate and not assume. That's good advice to remember. The ops case could simply be a chafed wire. Ive seen it before. And dealerships do not diagnose them usually. If a shift solenoid dies or a belt or pump or chain in the trans/ tranfer case breaks..... they just or in a new unit rather than look into it.You currently have the same symptom possibly as others reporting the failure, but IMO it does not necessarily mean you have the same cause. Best to you. You have a lot of preponderance there and I suspect will have to bear the burden of proof.
I’m not trying to minimize this, but one thing stands out to me here. This so far has been reported as an electronic/software failure. I don’t believe that I have seen anywhere that this is what I would call a “classic mechanical issue”….like the trans design is junk…or the gears are not tough enough…or the clutch fails, etc.
So, I suspect they will fix the issue with software or in some cases, a new circuit board. Of course the big issue currently is, that fixing this requires a replacement trans, but I would not be surprised if Hyundai devises a way to replace the oil pump with the defective circuit board in the field in the future. This will be interesting to see how this plays out.
Most of the failures I've heard of was one of the two pumps. That's not software or electrical