There are 7 stored owner reports matching the speed control & cruise leading-label group for the 2024 Kia EV9 in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 7 of 7 matching reports.
Open the full vehicle complaint log (all categories)What happened? While driving at highway speeds (approximately 60-75 mph), the vehicle exhibits a pronounced up-and-down motion at the rear, commonly referred to as “porpoising.” This motion is especially noticeable when traversing uneven road surfaces or expansion joints. This issue compromises vehicle stability and passenger comfort, posing a potential safety risk during high-speed travel. The problem has been consistently reproducible under similar driving conditions. The vehicle has not yet been inspected by a dealer or independent service center for this specific issue. No warning lights or error messages have appeared on the dashboard in relation to this problem. Component suspected: Rear suspension system (exact cause UNKNOWN). I am willing to have the vehicle inspected upon request.
Vehicles accelerates aggressively to no limit (95+) when adaptive cruise control is set and there is no leading vehicle within following range.
Instrument panel was non-functioning
My gauges stopped displaying any information outside of the gear selection. I had no Speedometer, or acess to any of my safety features. This has happened twice and gauges will turn on again on the next drive if sufficient time has passed.
Cluster behind the steering wheel was blank, has happen twice within the last 30 days. This is an issue since I had no speedometer and had to use WAZE to guess how fast I was going. It resolved itself after turning off the EV9 for about 45 - 60 mins. First time it happen on Sept 27, 2024, and then it happen again today Oct 21, 2024.
While using adaptive cruise control on the highway, my car almost rear ended the car in front of me when it surged ahead around a slight curve in the road. I was travelling approximately 5mph below the set cruise speed due to the traffic ahead. It appears that my vehicle lost radar sight of the car in front and tried to get back up to the set speed. This has happened on multiple occasions now.
When in Highway Drive Assist mode, where the system controls the speed and lane keep and lane change, the system can disengage without any visual or audio warning. This causes dangerous scenarios where the driver believes the car is in control but it is not.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.