Nov 13, 2025Transmission & drivetrainElectrical systemFuel system
Was driving for 12 miles, at a stop light. Light turns green, I accelerate, loud collision warning goes off and warning “battery overheated! Pull over safely and leave the vehicle”. Could not pull over safely because the car immediately ceased and locked up, car behind me nearly rear ended me and swerved to avoid. Is this another ICCU unit failure? Car towed to dealership (car has 2056 miles in it, it’s practically new) and been there for almost a month now with no repairs done and still diagnosing the problem. This car is unsafe.
NHTSA ODI 11699281
Nov 11, 2025Transmission & drivetrainElectrical systemFuel system
On the first snowy day of the year, the car experienced an apparent ICCU failure. Loud pop followed by warning lights, reduced power and eventual complete shutdown of the car. Car has been towed to dealership for diagnosis and repair.
NHTSA ODI 11698701
Nov 10, 2025Transmission & drivetrainFuel system
I heard a "pop" and then immediately saw "check electric vehicle system". The code I'm receiving in the app is P1A9096. The car was limited in driving speed, and I managed to get the car to the dealer before it stopped driving completely. I have about 8000 miles on this <1 year old car, and it seems like the ICCU has fried. Hyundai says this is under 1% of all cars, but from the internet it seems like this happens way more frequently. Reporting to the NHTSA so that there's record of this happening, given the frequency it seems to happen on the internet and the paucity of solutions (beyond putting in another faulty part) from Hyundai.
NHTSA ODI 11698598
Aug 19, 2025Transmission & drivetrain
Vehicle will hesitate/shudder and pulsate at highway speeds. Between 57mph and 78mph seems to be where I can feel it the most. This happens on all drive modes and with or without brake regeneration turned on or off. Nothing seems to make it worse or better. Here is an example. If you are driving 65mph on the highway and holding your speed steady, the car motor feels like it's cutting in and out. Juddering forward and back. If you accelerate a tiny bit, it gets ever worse. It feels almost like the input signal from the peddle is choppy, causing the car motor to judder. It is a forward to back motion. Not a vibrate or side to side motion. I took the car to the dealership where they confirmed they could feel it too. They ended up rotating my tires... Said that's all they can really do because Hyundai doesn't have anymore information. They basically said sorry but they can't help.
NHTSA ODI 11681677
Aug 19, 2025Transmission & drivetrain
I leased a 2025 Hyundai Ioniq 5 with the exact same issue. The VIN is [XXX] My new Hyundai Ioniq 5 is having the same problem again! Vehicle will hesitate/shudder and pulsate at highway speeds. Between 57mph and 78mph seems to be where I can feel it the most. This happens on all drive modes and with or without brake regeneration turned on or off. Nothing seems to make it worse or better. Here is an example. If you are driving 65mph on the highway and holding your speed steady, the car motor feels like it's cutting in and out. Juddering forward and back. If you accelerate a tiny bit, it gets ever worse. It feels almost like the input signal from the peddle is choppy, causing the car motor to judder. It is a forward to back motion. Not a vibrate or side to side motion. Dealership said basically they'll keep the car and possibly we can hope Hyundai will lemon law me out of the car. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA ODI 11681678