2025 Hyundai Ioniq 5 transmission & drivetrain problems

Related recalls

No recalls on file.

What owners say

1. Filed Sep 19, 2026COElectrical SystemTransmission & Drivetrain

   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…

   NHTSA complaint #11765558 · source
2. Filed Aug 12, 2026NCElectrical SystemTransmission & Drivetrain

   I started the car and got the warning "check electric vehicle system." The car then lost power. It would only go 27mph with the accelerator pedal pushed all the way to the floor. My safety was at risk because my car was not responding appropriately to driver input. The car is at the dealership as it is undriveable in this condition. This is the second incident with this vehicle within 6 months.

   NHTSA complaint #11756602 · source
3. Filed Jul 11, 2026CACrashOther / UnknownTransmission & Drivetrain

   I was slowing down, actively pressing the brake pedal to bring the vehicle to a full stop. As the car decelerated to what my senses and perception registered as a full stop, I pressed the “P” (Park) button while keeping my foot on the brake pedal. I felt the physical click of the “P” button under my thumb while still holding the brake, and my mind registered that the vehicle had successfully transitioned into Park. Before turning around, I visually confirmed that the vehicle…

   NHTSA complaint #11749766 · source
4. Filed Jul 9, 2026CAElectrical SystemTransmission & Drivetrain

   During a family road trip, my 2025 Hyundai Ioniq 5 (~9,000 miles, less than one year old) suddenly showed red "Check Electric Vehicle System" and 12V battery warning lights and then completely lost power. The 12V system failed entirely - the vehicle could not be driven or shifted, and the doors and the rear hatch could not be locked or unlocked. It had to be flat-bedded to a Hyundai dealer because it was completely inoperable. The dealer diagnosed a failed ICCU (Integrated…

   NHTSA complaint #11749425 · source
5. Filed May 30, 2026MAElectrical SystemFuel, Hybrid & EV PropulsionTransmission & Drivetrain

   Vehicle was parked in closed garage overnight. In the morning I tried to start the car and it was unresponsive. key fobs, digital keys, NFC cards none of them were able to open the car. Used a physical key to open the door, and then tried to turn the car on, nothing worked all screens remained black and car was unresponsive. AAA confirmed that the 12V battery was fully dead. When they jumped the vehicle we heard a pop in the car, which is a known ICCU failure indication. The…

   NHTSA complaint #11741000 · source
6. Filed Apr 15, 2026GAElectrical SystemFuel, Hybrid & EV PropulsionTransmission & Drivetrain

   Car charged as scheduled overnight 3/28/26 but was dead the morning of 3/29/26 and when it was jumped gave error "Battery overheated, please stop and exit vehicle" and "check electrical system" - vehicle has been in shop for 16 days, no diagnosis except that it "probably" needs a HV battery.

   NHTSA complaint #11731464 · source
7. Filed Apr 3, 2026CAElectrical SystemTransmission & Drivetrain

   On April 1, 2026, my 2025 Hyundai IONIQ 5 experienced a cascading electrical failure. The vehicle first displayed a warning about a problem with the on-board charger, followed shortly by an alarm and the 'Stop Vehicle and Check Power Supply' warning with a red 12V battery indicator, rendering the vehicle unsafe to drive. Had I been on the freeway this would have been extremely dangerous. My Bluelink diagnostics history confirms three fault codes from that date: P1A9096 (ICCU…

   NHTSA complaint #11729122 · source
8. Filed Mar 20, 2026NJElectrical SystemAcceleration & Cruise ControlTransmission & Drivetrain

   ICCU unit of the car short circuited right in middle of driving and caused the car to go in "limp mode". Sudden pop noise and slowdown created situation where car could be rear-ended. The part has already caused recall for prior model years, but model year for my car is not included in the recall. Based on internet search it is a continued and widely prevalent issue, manufacture has not done enough to fix this and a recall needs to add new model years. Additionally, the…

   NHTSA complaint #11725781 · source
9. Filed Mar 18, 2026MNElectrical SystemTransmission & Drivetrain

   I started driving and pulled out of a parking lot onto a busy road. The ICCU had failed unknownst to me and as I was underway the car started losing power and the dashboard lit up with warnings about the electrical system. I was limited to 25 MPH for a brief time and struggled to turn off into a parking lot amongst much faster traffic. While doing this the car slowed further to 10 MPH. I limped at this speed into the parking lot at which point it turned off and lot all…

   NHTSA complaint #11725135 · source
10. Filed Mar 17, 2026CAElectrical SystemTransmission & Drivetrain

    ICCU fuse blew during operation, car went into limp mode. Vehicle is currently being serviced under warranty through Hyundai

    NHTSA complaint #11724964 · source
11. Filed Mar 17, 2026NHTransmission & Drivetrain

    The Integrating Charging Control Unit (ICCU) failed while attempting to accelerate onto an Interstate Highway. The car then went into 'Limp' mode which only allowed a sped of 20 mph. Luckily I was able to get to the next exit without getting hit by car already on the highway going ~60-70 mph. The car showed both a 'battery warning' and a 'car over heating' symbol (the car has no engine, so assume it was the battery that over heated). The ICCU was recalled by Hyundai in the…

    NHTSA complaint #11724889 · source
12. Filed Mar 15, 2026NVDriver Assistance & Safety TechTransmission & Drivetrain

    1 Vehicle fails to start x 6 , dealer unable to fix, falsely identified 2 documented DTCs P31C507 specifically indicates a "possible condition with your Vehicle Control Unit (VCU) / Low DC-DC Converter (LDC)" dealer stated as charger problem when this is often associated with thousands of ICCU problems in this vehicle 2 many ADAS cruise control faults. A vehicle slows and, once stopped, at freeway speed on corners or when a large vehicle is in a nearby, separate lane. Fails…

    NHTSA complaint #11724482 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology