2026 Hyundai Ioniq 9 Owner Complaints
Complaint Summary
The 2026 Hyundai Ioniq 9 has 8 reported complaints.
- Top issues involve lane departure: assist and electrical system.
Reliability Score
Reliability Score
Based on 8 complaints
Most Frequent Issues
LANE DEPARTURE: ASSIST
2 25%
ELECTRICAL SYSTEM
1 12.5%
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
1 12.5%
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
1 12.5%
SERVICE BRAKES
1 12.5%
Quick Insights
The top category is LANE DEPARTURE: ASSIST, accounting for 25% of all complaints.
Owners have reported issues across 7 distinct vehicle systems.
Note: Complaint data reflects owner reports and may not always indicate a verified defect. Compare with Recalls and TSBs for a complete picture.
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What owners keep reporting on the 2026 Hyundai Ioniq 9
The 2026 Hyundai Ioniq 9 has 8 owner complaints in this dataset. LANE DEPARTURE: ASSIST is the most common complaint category, representing about 25% of the reports shown here.
Most common complaint categories
The top complaint groups for the 2026 Hyundai Ioniq 9 are LANE DEPARTURE: ASSIST (2), ELECTRICAL SYSTEM (1), FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL (1).
Are these complaints a serious red flag?
Potentially. 3 complaint reports involve higher-attention systems like brakes, steering, engine, powertrain, fuel, suspension, airbags, or electrical components, which is enough to justify a focused inspection.
What should buyers inspect on a used 2026 Hyundai Ioniq 9?
Start with the top complaint systems, compare them against the recall report, then inspect service records for evidence that those same areas were already repaired or monitored.
Detailed Complaint Log
Showing 7 of 7 systems
LANE DEPARTURE: ASSIST
2 Reports25% of totalPreviewing the first 2 complaint summaries.
Occasionally while driving my IONIQ 9 in sunny conditions with glasses on while utilizing Lane Keep Assist and the Adaptive Cruise Control system the car flashes a Warning about keeping your attention on the road, and then continues on beeping and chiming before ultimately completely stopping in the middle of the road unless you disengage the Lane Keeping Assist and Adaptive Cruise Control. I believe the sensors on top of the Steering Wheel arenât calibrated that great for people who wear glasses, as this issue does not occur when I take my glasses off. I am not in any way obstructing the sensors, and in all cases when this has occurred, my attention is on driving and the fact that the vehicle begins to decelerate into a complete stop while in the middle of traffic is terrifying. This has happened to me about 3 times now since getting the car and all 3 times it was while I was wearing my regular glasses. When I have my sunglasses on I havenât experienced the issue.
9/24/2025
While driving on the freeway utilizing Highway Drive Assist, I suddenly received a warning on the heads up display stating that assisted systems were unavailable, at which point the Adaptive Cruise Control & Lake Keep Assist both deactivated. I pressed the button on the steering wheel to reactive the system and received "conditions not met" error. At this point, I placed my foot on the accelerator and it was completely unresponsive. I stabbed at hte accelerator as well as held it down without issue. Regenerative breaking also did not reactive. Fortunately, I had enough momentum to change lanes safely to the shoulder and power cycle the car. I took the car to my local dealership who did a brief test drive and could not recreate, returning the car to me without contacting Hyundai proper, and recommending I call them directly myself.
12/16/2025
ELECTRICAL SYSTEM
1 Report13% of totalPreviewing the first 1 complaint summaries.
My ICCU failed, which caused a fuse to blow and some electrical wiring in the car to melt. This caused the car to completely deplete the 12V battery, which left the car completely inoperable. The vehicle was towed to a Hyundai dealership, where they ordered the relevant parts and changed them under warranty. I was without the car for roughly two weeks.
6/27/2025
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
1 Report13% of totalPreviewing the first 1 complaint summaries.
Occasionally while driving my IONIQ 9 in sunny conditions with glasses on while utilizing Lane Keep Assist and the Adaptive Cruise Control system the car flashes a Warning about keeping your attention on the road, and then continues on beeping and chiming before ultimately completely stopping in the middle of the road unless you disengage the Lane Keeping Assist and Adaptive Cruise Control. I believe the sensors on top of the Steering Wheel arenât calibrated that great for people who wear glasses, as this issue does not occur when I take my glasses off. I am not in any way obstructing the sensors, and in all cases when this has occurred, my attention is on driving and the fact that the vehicle begins to decelerate into a complete stop while in the middle of traffic is terrifying. This has happened to me about 3 times now since getting the car and all 3 times it was while I was wearing my regular glasses. When I have my sunglasses on I havenât experienced the issue.
9/24/2025
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
1 Report13% of totalPreviewing the first 1 complaint summaries.
Occasionally while driving my IONIQ 9 in sunny conditions with glasses on while utilizing Lane Keep Assist and the Adaptive Cruise Control system the car flashes a Warning about keeping your attention on the road, and then continues on beeping and chiming before ultimately completely stopping in the middle of the road unless you disengage the Lane Keeping Assist and Adaptive Cruise Control. I believe the sensors on top of the Steering Wheel arenât calibrated that great for people who wear glasses, as this issue does not occur when I take my glasses off. I am not in any way obstructing the sensors, and in all cases when this has occurred, my attention is on driving and the fact that the vehicle begins to decelerate into a complete stop while in the middle of traffic is terrifying. This has happened to me about 3 times now since getting the car and all 3 times it was while I was wearing my regular glasses. When I have my sunglasses on I havenât experienced the issue.
9/24/2025
SERVICE BRAKES
1 Report13% of totalPreviewing the first 1 complaint summaries.
When my Ioniq 9 was in reverse, the brake did not work. The car kept rolling and I had to turn it off to stop the car.
11/18/2025
POWER TRAIN
1 Report13% of totalPreviewing the first 1 complaint summaries.
While driving on the freeway utilizing Highway Drive Assist, I suddenly received a warning on the heads up display stating that assisted systems were unavailable, at which point the Adaptive Cruise Control & Lake Keep Assist both deactivated. I pressed the button on the steering wheel to reactive the system and received "conditions not met" error. At this point, I placed my foot on the accelerator and it was completely unresponsive. I stabbed at hte accelerator as well as held it down without issue. Regenerative breaking also did not reactive. Fortunately, I had enough momentum to change lanes safely to the shoulder and power cycle the car. I took the car to my local dealership who did a brief test drive and could not recreate, returning the car to me without contacting Hyundai proper, and recommending I call them directly myself.
12/16/2025
FUEL/PROPULSION SYSTEM
1 Report13% of totalPreviewing the first 1 complaint summaries.
While driving on the freeway utilizing Highway Drive Assist, I suddenly received a warning on the heads up display stating that assisted systems were unavailable, at which point the Adaptive Cruise Control & Lake Keep Assist both deactivated. I pressed the button on the steering wheel to reactive the system and received "conditions not met" error. At this point, I placed my foot on the accelerator and it was completely unresponsive. I stabbed at hte accelerator as well as held it down without issue. Regenerative breaking also did not reactive. Fortunately, I had enough momentum to change lanes safely to the shoulder and power cycle the car. I took the car to my local dealership who did a brief test drive and could not recreate, returning the car to me without contacting Hyundai proper, and recommending I call them directly myself.
12/16/2025
Data and Methodology
Scores are derived from NHTSA recalls and owner complaints, normalized by vehicle segment averages.
What are the most common owner complaints for the 2026 Hyundai Ioniq 9?
Are complaints about the 2026 Hyundai Ioniq 9 a serious warning sign?
How should buyers use complaint data for the 2026 Hyundai Ioniq 9?
Are complaints about the 2026 Hyundai Ioniq 9 severe?
Complaint list entries are sourced from owner-submitted NHTSA ODI records.
Hyundai Ioniq 9: How should complaint data influence buying decisions?
Carfocal links complaint data directly to recall and maintenance routes for the same model year.
- Complaint entries
- 8
- Top-topic view
- 5 grouped topics shown
- Primary source
- NHTSA ODI owner complaint records
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