Just got my Niro EV back from the workshop, they changed the engine mounts to some other type. Most probably the rubber is softer, which reduces the sound contribution from the vibrations. But the sound is still there, only lower. Both at accelerating and regen. A card in a bicycle spoke as someone said.
There seems to be some kind of action plan, at least here in the EU:
1. Change the engine mounts to lower the sound level. I the customer can´t hear it; problem solved by "patching".
2. Change the gearbox.
When I got my car, I asked the technician of the next action if this is not enough, and he, a bit reluctantly, said that next step would be to change the drive train. I then asked if that includes both motor and gearbox, and he answered: "-The gear box, I think". OK, I thought for myself. We´re in for a long ride here. Thank god for the 7 year warranty. But beware, DO NOT miss any services as this would present an opportunity to Kia to get out from this situation.