Have you had any luck or updates with the dealership or with Kia Corporate? I have the same issue with my 2019 plug-in Kia Niro and am getting the response that it’s my responsibility to prove this problem exists. It’s been going on for almost a year now so I barely drive the car because it feels so unsafe.I just bought a Niro PHEV two weeks ago and after driving it for a couple of days i started getting a loud jerk when starting from a full stop. At first it started happened in EV mode only but I've had it happen in Hybrid mode a couple of times ( not sure if the engine is actually working or just on for Heating). The sound and jerk can best be described as what happens when you drive a stick shift and you pull the clutch too quickly in first gear without any gas and the car jerks forward.
The challenge here is that is happens RANDOMLY and is impossible to replicate accurately. It's happened in 'cold' weather early morning ( 40 degrees F) when the car has been running for a while, when I back up and then switch to drive. The dealership is giving me the run around since they haven't been able to replicate the problem when they drive it so they refuse to take the car in and open a ticket. I have a video where you can clearly hear the loud noise and se the 'jerk' but can;t attach it here. If anybody else has seen this problem please advise. The dealer says they checked the worldwide Kia database and haven't found any similar problem ( therefore refuse to work on it). They drove it around with the sensors and 'testing kit' and say all the reading are fine. I believe the car is unsafe to drive but apparently the dealer doesn't agree.
The car has less than 500 miles on it so this is clearly a factory defect. I have escalated the issue to customer service and I'm waiting to hear what they come back with.
Please let me know if anyone has had a similar problem, the more information i have the quicker they can get to the bottom of this!!