What 381 owners told NHTSA about the 2023 Hyundai Ioniq 5 Bev

Have had 2-12v battery issues and now an ICCU failure with about 28 days at the dealership with no parts to repair. Seems to a common issue popping up

NHTSA ODI 11642666

Car stopped driving. got a check power systems error and car went into limp mode then stopped altogether

NHTSA ODI 11641623

The car has had multiple recalls for the ICCU failure. I have brought the car in been 3 times. Will go in again this week . The recall remedy never fixes the issue. The car works for a few weeks then the same issue happens again .Unable to start the car or drive . Has been going on since June 2024.

NHTSA ODI 11634173

I started my car and after a minute I received a warning saying to check my electrical system and safely pull over. After 5 minutes of trying to drive to the dealership the car suddenly slowed down to a max speed of 27mph and then shortly after slowed to a stop and turned off. The car would not turn on and eventually the 12v battery died. I tried to jump the car but the 12v would not stay charged long enough to put the vehicle into drive. It appears the ICCU is not working and cannot keep the 12v charged to make the car function .

NHTSA ODI 11624475

Driving the vehicle on the highway for longer than 60 miles at highway speeds the vehicle goes into “power limited” mode and a turtle pops up on the screen. You are unable to accelerate the car and once this happens you have to leave the car off for at least 5 minutes and then not drive above 65mph again or it will keep happening over and over. After taking it to the shop Hyundai Corporate said we need to drive the car again to see if they had fixed it. Approximately 65 miles into the trip it happened again and this time I was almost rear ended and cars were swerving around me on the shoulder to avoid crashing into me. Hyundai is saying that they cannot reproduce the issue but they are not driving the car on the highway for more than 60 miles. The safety of not only myself and my family is at risk as well as other people on the highway behind and next to us. The vehicle is currently at the dealership and they said there are no error codes so they don’t know what’s wrong. The only warning that popped up said “power limited” with a turtle.

NHTSA ODI 11568130

I started getting the error Electric Vehicle System error in my month old Ioniq 5. After driving a few miles, the air conditioning stopped working completely. And after a few more miles, the vehicle started to throttle down the speed to 20-25mph that too on the I95 with a 65mph speed limit. Had to turn on the emergency lights and drive slowly till I reached my destination. After googling for a while, I found that this issue is related to the ICCU failure that is pretty common in the Ioniq 5 and Hyundai is yet to issue a permanent fix for this problem. I don’t know why we are allowing the sale of these vehicles with known issues. You can even Reddit the ICCU issue.

NHTSA ODI 11552424

See uploaded photos and document.

NHTSA ODI 11550213

9/11 Saturday lease deal agreed 9/13 car picked up 9/23 Air conditioning stopped working and car throws a warning message requesting immediate service. 9/25 Parts required to fix the problem not available in the US or Canadian Hyundai Parts inventory and dealer does not know when they will get the parts. 10/3 Dealer advises no update on parts. Hyundai Customer Care notified today and is investigating. From what I can determine, this is the dreaded ICCU issue which plagued the 2022 Ioniq 5.

NHTSA ODI 11548051

Rear electric motor overheating on highway and motor shuts off only allowing front motor to work but acceleration is near nothing and is extremely dangerous. No codes or warnings pop up was told by friends with other ioniqs that it's a electric motor oil pump that malfunctions but hyundai refuses to solution ND realize that there is a problem with motor malfunction

NHTSA ODI 11544442

While driving on the highway, after about 45 minutes, the electric vehicle goes into Turtle power-limited mode. The vehicle instantly reduces in speed from 70mph to as low as 35 - 45 mph. There are no warning lights or sounds. If you immediately stop the car and let it sit, it will work again temporarily but after 30 - 40 more min or less of driving, it will again go into turtle mode. Additionally, acceleration is non-existent when its power is limited, inhibiting the ability to safely drive as required to pull over or across intersections. This has been a constant event occurring multiple times and each time the vehicle has been on a freeway or highway. The dealer applied the repairs in the photo supplied, but they did not work.

NHTSA ODI 11538261

EV goes into power limited mode when on interstate when going ~50 miles while driving 70mph or more. Happened each of my 3 times on interstate of about that distance. First time was Sat 4/29 while in eco mode with 70% battery and 82°F outside, 1 hr drive 50+ miles. Second time was in normal mode Friday 5/12, 55% battery 72°F outside 1 hr drive 50+ miles. Third time was in normal mode and it happened after 42 miles. I scheduled a service after the first incident but they were only able to take it on 5/31. When this happens you lose ability to accelerate and have to coast to the side of road and let it sit for 10+ minutes to clear and then can resume, I would take surface roads after it occurred. Impacts safety for self and others, as it drastically slows without brake lights causing a high chance of being rear ended. The last incident was close to it. As it was getting worse I stopped driving on interstate with it. Car has been at the dealership's service department since 5/31. They were able to easily reproduce once they finally got to it. They diagnosed a bit and then consulted design engineers. Diagnosed on and off for a couple weeks and have finally decided to replace the drive motor. Part received Friday 6/16, to be installed tomorrow 6/20. We'll see if that addresses.

NHTSA ODI 11527797

What component or system failed or malfunctioned: Rear electric motor. Specifically the "engine oil pump" that is used to cool the rear motor. The pump does not respond to MCU commands and does not cool the motor. This causes the motor to overheat after about an hour of highway driving causing the motor to provide VERY limited power. How was your safety or the safety of others put at risk: When the above happens the car experiences a delayed throttle, and very little power to accelerate. This occurs while traveling on a highway where you may need to pass, but no longer have the power to do so safely. Has the problem been reproduced or confirmed by a dealer or independent service center: Dealer took the car in and did not properly attempt to reproduce the issue. Then stated that if the car does not produce a DTC then there is no issue. The dealer has since refused to accept the car again. This has been reproduced here: https://www.ioniqforum.com/threads/rear-motor-not-operating-45-min-after-charge.46007/ Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others: No, I have just started the process of reaching out to the manufacture, and if this fails I will be using my states lemon laws. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear: No this issue does not appear to throw any codes, lights, or messages. The dash shows the rear engine producing no power, and the throttle will only show half when pressed to the floor.

NHTSA ODI 11525379