2023 Hyundai Ioniq 5 driver assistance problems

Filed Jul 5, 2026 · Driver assistance · IL

The ioniq 5 highway driving assist, which steers the car and keeps it centered in the lane, will disengage without clear warning - the small green steering wheel icon (which is at the top of the dash cluster) simply becomes grey and blinks, but there's no audible chime to indicate that the car has disengaged the steering assist. I have had multiple times on the highway where it disengaged and I don't notice (because I am looking at the road, not the dash) and one time on the highway it disengaged during a turn and hit the rumble strip, causing me to swerve back onto the road. My hands were on the steering wheel and I was paying full attention, but I was expecting the car to handle the turn, and it just disengaged without me noticing. Had there been another car in the middle lane or I reacted slower, it's likely a crash would have occurred. This has been documented as well on Reddit and confirmed by multiple owners, who have mentioned they have disclosed to the manufacturer: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 24, 2026 · Driver assistance, Electrical · OR

See attached document for complaint.

Filed Mar 9, 2026 · Brakes, Driver assistance · CA

On [XXX], I received a warning on my 2023 IONIQ 5 that said “stop vehicle and check braking system” and the car went into “turtle mode”. I took it into the dealer for repairs and they said the issue was related to the 12V battery and returned the car to me as repaired. Then, on [XXX], I was driving the car and I got the same error message but this time the car’s brakes didn’t work. Thankfully, I was able to pull off the surface road I was on and pulled into a residential area where I used the parking brake to stop the car. I then had it towed to the dealer and they are currently in the process of repairing it. My son and I were in the car at the time of the [XXX] incident and were very fortunate that we did not hurt anyone or ourselves when the brakes didn’t work. As of today, the Hyundai dealer (Roseville, CA) says they are repairing a brake component that was defective but they missed this on the 2/28/26 inspection. See attached photo of the warning indicator. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Feb 10, 2026 · Driver assistance, Electrical · WA

ICCU FAILED and Hyundai service states that part is back ordered indefinitely. Has been 2 weeks with no further updates Additionally service department is unable to repair forward monitoring sensors that quit working with the smallest amount of precipitation, sometimes just from road condensation.

Filed Jan 2, 2026 · Driver assistance · IL

I was traveling 70mph on Interstate 70 when I heard a loud “pop” sound and the car immediately slowed down to 20mph in heavy traffic. The care then would not go over 20mph.The car was charged at home the night prior. On the dash was the “stop vehicle and check power supply” warning. This is the very common ICCU issues known to plague the Hyundai EV fleet. This is very dangerous when your are in heavy interstate traffic going at a high rate of speed.

Filed Dec 20, 2025 · Driver assistance · FL

Due to a heavy brake application a water bottle in the back seat spilled and the water traveled under the drivers seat. This resulted in multiple car systems going offline, vehicle reporting LKAS error and inability to turn the car off. This essentially bricked the vehicle. Repair in order to correct the shorts and corrosion from the water both the drivers seat and main floor wiring harnesses require replacement cost estimate approximately $12,000. These key electrical connections under drivers seat are not adequately protected from simple water damage. This in my opinion makes the vehicle unfit for use as a family EV SUV as a simple water bottle still should not be able to brick a car. I consider this a design defect and the manufacturer is not covering this under warranty.

Filed Nov 20, 2025 · Driver assistance · MD

Several times now the "Check Driver Assistance System" and "Check Lane Assist System" have come on and stayed on. I brought the car dealership, and they fixed it--but only temporarily--the problem recurs within a few days of the fix. All of the sensor cameras are clean. I have read that a weak 12-volt battery can cause this problem, but the car has only 28k miles on it, so the battery should not be weak yet. I will bring the car back to the dealer (again) and have them check the 12-volt battery strength. But I am at the point where the "check system" messages are on more than they are working correctly.

Filed Nov 4, 2025 · Driver assistance · VA

I suddenly received errors that my sensors weren’t working, and I can no longer use my cruise control. The car has less than 60,000 miles so it still has the full bumper to bumper warranty. I have never had a collision. So I took it in to the dealer and they said the camera was mis-aligned and is not covered under warranty. It should be covered as I’ve never had a collision. Based on my online research, many people with Hyundai Ioniq 5s have experienced this same issue at no fault of their own, so it is a systemic problem. I took the vehicle to the Pohanka Hyundai in Fredricksburg, VA

Filed Feb 3, 2025 · Driver assistance · SC

Condensation builds in front of the camera. The car starts jerking all over the road with no warning. There is no error other than noticing that the car cannot keep itself in the lane. When trying to disable the features, they get turned back on automatically.

Filed Jan 1, 2025 · Driver assistance · CA · crash

The rear video camera fails intermittently. It works sometimes and doesn't at times. The same with the rear cross traffic warning and pedestrian warning. I've taken my car to the dealer service center but they claim to not being able to reproduce the issue. I know the issue still exists since my husband hit a parked car while backing out of a driveway since there was no alert provided and the rear camera did not work.