This is exactly what i experience in my car for the last two years and three trips to the dealer. At this point all warranty work has been completed but the "stutter" remains. I agree it seems to be primarily when the engine is cold but it happens when warm and traveling at coasting speeds on the highway. I'm also only getting 42MGP and i drive a mix of highway and city. Not horrible, but not what is advertised.I registered to share my 2 cents. The quote above nails it especially the part in bold print (ok apparently this didn;t work so in between the random B's). It's only in gas mode. Now to those who say its the DCT, I worked at a VW dealer and it's not the same thing. To those who think this is just a hybrid thing, it is not my first hybrid and it only happens when the display shows gas only mode. It happens in almost a rhythmic way, like a nail in your tire when moving slow, it has a consistent timing to it (not sure if that makes sense). It feels similar to a transmission slipping but not exactly like that either. It actually bucks you while your driving, like intermittent boosts of power. It's very difficult to explain to someone who has never experienced it. If you stomp on the gas or if you let go of it completely, it disappears. If the battery joins the party it disappears as well. I'm not sure if I helped or confused people more here but I wanted to express that there is yet another person here with a 2017 having issues.
I have the benefit of owning two of these, same year and same trim. One has these issues and the other doesn't the one with no issues is also getting 52mpg and drives primarily highway. Some of the other post mention dealerships looking up serial numbers. Doesn't this confirm a batch of bad parts!? I assume i have one Niro with good parts and one with bad parts.
Any recommendation in forcing the dealers hand to actually do something or should i just keep taking it back?