When you're at speeds greater than 15mph and hit a bump or encounter a surface irregularity (pothole, expansion joint, etc.), the Kia EV9 GT Line goes into a porpoising sway, causing the entire chassis to become unsettled. The swaying is much more pronounced when only one side of the encounters the irregularity, or if the car is not perfectly perpendicular to the irregularity and the left and right wheels pass over the irregularity at different times. The effect is especially noticeable in the rear. This unsettling 'swaying' increases with speed and happens both while driving straight and through corners. The rear end feels as though it's hopping or skipping from side to side. Out of all the vehicles I-??ve driven-?"and I-??ve driven quite a few-?"I-??ve never experienced anything like this. During wet and slippery conditions, driving over small bumps or manhole covers has even caused the vehicle to lose traction and begin spinning - even while traveling at 25mph in a straight line. I purchased the EV9 in early 2024 and it has had the issue since delivery. I have heard many other EV9 GT Line owners complain of similar suspension issues and I am frankly surprised that there has not been a string of crashes and fatalities linked to the issue. I have spoken to the Kia dealership several times but because the vehicle is new they claim that they have not heard any other reports and they do not have the experience to diagnose or fix the issue.

- Marysville, WA, USA

When driving over uneven surfaces, like typical urban and suburban roads and highways, the rear end seems so wobble and slide. It feels like the heavy EV is about to break traction and slide sideways. It porpoises as well. It makes every passengers heart skip a beat. These are on dry roads, obeying speed limits, with the stock tires. An expansion joint, seam of two types of road material, utility cover or other irregularities can cause this. Easily reproduced but dealers or Kia America don-??t seem to believe or care.

- Sunnyvale, CA, USA

The manufacturer failed to align the vehicle at all prior to leaving the factory. The failed parts all have to do with the alignment. My safety was put at risk because of the persistent pull while driving, shaking while driving, instability at high speeds, and the fact that the tires are now damaged due to the alignment issues. The dealer kept the vehicle for over 60 days, and was able to rectify part of the alignment issues, but there are still areas that they are unable or unwilling to fix, as shown to them by the alignment machine. The vehicle has been inspect by a certified Kia dealership, as it was there for over 60 days. The issues were the shaking of the vehicle, the pull, the instability at high speeds, and the damage caused to the tires. It appear upon first taking the car home after purchase. I was forced to pick up my vehicle because Kia was unwilling to fix the vehicle, and they threatened me with storage fees.

- San Antonio, TX, USA

I brought the vehicle in to have recalls addressed on 12/30/24. Starting the next day we noticed the car was weaving without any steering, but thought it might have been icy road conditions and waited to see if it reoccured. The car has since weaved intermittently, but has righted itself after releasing the accelerator. However, on 1/15/25 while traveling about 50mph, the car started weaving on its own and when the accelerator was released the car started to wildly fishtail. Called dealer and they agreed this was a serious issue and agreed to see car the next morning. Service tech said when they drove the car it did the same thing and that the troubleshooting recommended I change the regenerative braking setting to "smooth" and sent me on my way. I did not get even a mile before the car began weaving rapidly again on its own. Went straight back to dealership where manager wanted me to drive the vehicle again with the tech in car which I refused as it is not safe to drive. So he said if I was ok with it tech would take car out again but if it was just acting how regenerative brakes work, there wasn't much else they could do. When manager returned to talk to me, he said he ended up going with the tech and it did replicate the weaving action two times during that drive. The car is steering on its own weaving wildly left and right and imposes a great danger and no longer feels like a safe vehicle to drive.

- Granger, IN, USA

Active lane keeping function feature disengages without audible warning leading to multiple near collisions. Happens without warning or any particular trigger. Was brought to the kia specialist attention and he did not seem surprised or concerned. Happens almost every time this feature is utilized at some random point in the drive.

- Newbury Park, CA, USA

Brand New EV9 Land AWD has wheel shake and vibration at 65MPH+. Center console vibrates and shakes substantially. Performed multiple wheel balances without and real change. Multiple other people reporting same issues. Not sure if this is tire, wheel, or driveshaft related. Kia America seems to not be interested in investigating this. This car drives rougher than a heavy class diesel truck.

- Osprey, FL, USA

Brand New EV9 Land AWD has wheel shake and vibration at 65MPH+. Center console vibrates and shakes substantially. Performed multiple wheel balances without and real change. Multiple other people reporting same issues. Not sure if this is tire, wheel, or driveshaft related. Kia America seems to not be interested in investigating this. This car drives rougher than a heavy class diesel truck.

- Osprey, FL, USA

Bought a new EV9 and experienced steering shaking/vibrating heavily on high way speeds. There is always a subtle vibration on speed around 70mph where the cup holders in the middle of front seats vibrates, the driver seat and steering vibrates and creates a unpleasant and disturbing driving experience which can lead to anything worse. There are so many other complains on the similar issue but the manufacturer and/or service agents are not agreeing.

- South Windsor, CT, USA

The lane assist feature will not turn off. It also behave erratic. Today on the highway it lurched me towards an empty flatbed semi. It will also pull towards oncoming traffic and scares me to drive the car.

- Maple Grove, MN, USA

In brand new 2024 Kia EV9, the steering wheel shakes at or above speeds of 65mph. Replicated symptoms in all regen modes, as well as with regenerative braking turned off. Replicated symptoms with lane assist and highway driving assist both on and off. Issue presents itself on various different conditions of road surfaces. Brought vehicle to dealership service department and they stated that alignment was perfect and there was no unusual tire wear. Service advisor went on test drive with me and witnessed the symptoms but disregarded it as possible uneven road surfaces and said they wouldn't know how to go about fixing it. The service invoice states "nothing is wrong with this vehicle" which is completely untrue. Tire balance was not checked. Confirmed with other owners of both the EV9 and EV6 that this is an ongoing issue with no known fix action or open TSB from Kia. Issues are not present below 60mph.

- Newport News, VA, USA