NHTSA Complaint #11644992 — 2024 KIA EV9

The Kia EV9 has a defect in its suspension that causes the rear end to "bump-steer" over imperfections in the road, giving the driver a scary sensation of losing control. For example, driving on the highway in a corner, if you hit an expansion joint or pothole, the vehicle will require a quick steering correction while the vehicle's rear-end enters what feels like an oversteer condition. This reduces confidence in the vehicle's ability to hold the road. In poor weather like snow, it's impossible to discern whether the vehicle's rear end is sliding, or if it's the bump-steer condition occurring. My wife refuses to drive the car in inclement weather, despite the vehicle being fitted with snow tires. It is a very scary feeling. Kia has yet to issue a TSB for this on 2024 and 2025 model year vehicles, and it seems that all trim levels are affected after discussing with the community on forums. Even after dialing in the alignment perfectly to manufacturer specifications, the issue does not resolve.