2025 Hyundai Ioniq 5

I am writing to document my case regarding my leased 2025 Hyundai Ioniq 5 XRT. Vehicle: 2025 Ioniq 5 XRT, VIN [XXX] Lease start / delivery date: Odometer: 4,368 miles Servicing dealer: Stevinson Hyundai, [XXX] Case number: XXX What happened: On Saturday, XXX, while I was driving, the vehicle displayed "Stop vehicle and check power supply" with the red 12V battery warning and the master warning light, and power was limited to approximately 25 mph. The high-voltage battery was at 66 percent. I was able to get the vehicle home at reduced speed, and Hyundai Roadside Assistance towed it to the dealer the same day. The symptoms are consistent with an ICCU failure, pending the dealer's diagnosis. Photos of the instrument cluster are attached. I consider a sudden loss of drive power at 4,368 miles to be a safety-related defect, and I have reported it to NHTSA. My situation: This is one of two vehicles in our household, and both of us need to get to work. The dealer is about 30 miles from my home. I am without transportation as of September 19. What I am requesting: 1. Written authorization for a rental vehicle starting immediately and continuing until my vehicle is repaired and returned, including the approved daily rate and how billing or reimbursement will work. 2. A parts availability check and estimated repair date as soon as the dealer confirms the diagnosis. 3. If the vehicle is out of service for an extended period, reimbursement of my lease payments for the time I cannot use it. 4. Confirmation of the warranty coverage that applies to the ICCU on this VIN, including any extended ICCU coverage. I am keeping a record of the days the vehicle is out of service, starting XXX. Please reply in writing so I have everything documented. Thank you for your help, [XXX] [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11765558

Incident

Sep 19, 2026

Driving at highway speeds, the front end feels unstable. It feels as if the tires are jumping around and will move the car to the right or left. It is difficult to maintain control. I had it into the dealer shortly after I bought the car to complain about what I thought was a front end alignment problem. They didn't think there was an issue until they got it into the shop. They said afterwords that it WAS OUT OF LINE. But their fix did not hold, so I went in again for the one year maintenace and mentioned the problem, but they said it was not out of line. Well, The problem still exists. Something serious is wrong and needs to be fixed.

NHTSA ID

11763548

Incident

May 1, 2025

Full electrical power system failure. Heard a loud pop noise emanating from under the rear seats of the car. The power. Failure lights came on and the car lost power. We were able to get the car to slowly drive back to the garage where it completely shut down and was inoperable from that point on. Car has been towed to the local dealer for diagnostics and repair.

NHTSA ID

11762941

Incident

Sep 8, 2026

On 8/30 my vehicle experienced a power loss on a highway (reported here separately). I took the car to the dealership and they could not replicate the error and gave the vehicle back to me on 9/4. Later that day I had to drive 2 hours north to a wedding in the mountains. At 9:30pm my vehicle experienced a full drive power loss on an unlighted, curving, rural 2-lane mountain road in an area with minimal cell phone service. I tried to restart the vehicle several times and could not get any power. I called roadside assistance and had to wait over 2 hours in the dark on a winding mountain road for the tow truck to find us and then be towed 40 minutes away to the nearest dealership where my car is still sitting waiting to be looked at (2 hours away from where I live)

NHTSA ID

11762663

Incident

Sep 4, 2026

Driving home near my apartment, I had to join a busy highway from a full stop. I found a small gap and tried to accelerate to quickly merge into traffic, when my car made a high pitched alert noise and noticably did not accelerate beyond about 25 miles per hour on a 45-50mph highway with heavy traffic. I turned on my hazards and still ended up with a line up of cars honking behind me. Flooring the accelerator did absolutely nothing to increase my speed. On slight downhills I could get up to about 40mph but as soon as it leveled off my speed went back down to limping along. I was able to exit the highway at slow speed and tried to parallel park in an avaialble spot but could not reverse. I tried to drive on toward my house but the car could not make it up the hill even with the full accelerator pedal down. People were stuck behind me on my street so I turned the car off and back on again and the car appeared to resume normal operation and I was able to drive up the hill. I took the car to the dealer and they were "not able to replicate the error". They did fix a seat belt recall and updated the software for my ECU and said to come back if it happened again...

NHTSA ID

11762153

Incident

Aug 30, 2026

While driving this EV with cruise control on, the dashboard suddenly showed a message that “Smart Cruise Control conditions not met”. Attempting to re-engage the cruise control did not work and then the vehicle suddenly lost all propulsion (pressing the accelerator did nothing). The car quickly slowed to about 20 mph before we could maneuver it to the shoulder and turn it off. After a couple minutes, we restarted the car and drove it to the dealer. There were no other messages or warning lights or indicators. The dealer could not find anything wrong and asked us to pick up the car and resume using it. We use both a home charger (Emporia) and roadside (Tesla) chargers.

NHTSA ID

11761730

Incident

Aug 27, 2026

I heard a loud popped sound from the back of my car while driving home. The car lost power and eventually died on the street. The war displacy came on to tell em to check electrical system. I originally bought th car from Capitol Huyndai in San Jose on September 2025 and it has 5992 miles. I towed the car to Dublin Hyundai for repair and confirmed the DTCP1A9096 for ICCU computer failing to charge the 12 v battery. It was a well known recall . I do not have any update on the repair since 8/25/26. I worry about my safety because the car can lose power while driving

NHTSA ID

11761068

Incident

Aug 22, 2026

My car starting throwing a “check electric vehicle system” warning intermittently beginning on July 7, 2026 which went away when I restarted the car. This happened again on July 27, 2026 three to four times while I was driving. The car did not lose power. As I was going to dealer the warning cleared and no code showed up in my diagnostic history. On August 12, 2026, the car once again showed "check electric vehicle system” and would initially clear when I restarted the car. I then began having intermittent power. Floored, the car would only go 27 mph. Then it would speed up again, then slow again. I was not in “turtle mode.” Luckily, I was able to safely get the car to the dealership without having an accident. DTC P1A8D13 did show in my diagnostics. The technician found that the 12v battery input had melted at the ICCU. This is very dangerous and could have led to a vehicle fire. My 2025 is on its 2nd ICCU (now 3rd) and has not had any recalls, so this is very troubling.

NHTSA ID

11758690

Incident

Jul 7, 2026

Some IONIQ 5 (NEA EV) vehicles may set DTC P1E3000 while charging. Vehicle operation remains unaffected. This bulletin provides instructions to inspect, and if necessary, replace the affected rear inverter assembly.

Certain 2022 – 2024 model year IONIQ 5, 2024 model year IONIQ 5 Robotaxi, and 2023 – 2025 model year IONIQ 6 vehicles may require a replacement of the Integrated Charging Control Unit (ICCU) and ICCU Fuse. At Hyundai, we are committed to providing vehicles of outstanding quality and value. In an effort to meet this commitment, the warranty coverage for the Integrated Charging Control Unit (ICCU) and ICCU Fuse Replacement has been extended to 15 years/ 180,000 miles from the date of original retail delivery or date of first use (whichever occurs first) and is valid for original and subsequent owners.

This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2026 1st Navigation Map and Software Update Key Improvements and Additional Improvements tables in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater (NAU) and updated by USB.

Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. Technical Service Bulletin (TSB) 26-01-046H provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the scheduled climate reducing battery drainage.

Certain IONIQ 5 (NEA EV) vehicles may have 12V battery drainage due to the scheduled climate feature. This bulletin provides instructions to perform a software update for the Vehicle Control Unit (VCU) to improve the logic of the scheduled climate reducing battery drainage.

Some IONIQ 5 (NEA EV) vehicles may exhibit a no START/READY condition when pressing the START/STOP Button (SSB). This bulletin provides the procedure to inspect for the START/READY condition, and if needed, replace the Body Domain Control (BDC) module.