ICCU Failure causes the car to not work.
2023 Hyundai Ioniq 5 fuel system complaints
Page 2 of 3: complaints 11 to 40 of 68, newest first, as owners wrote them.
ICCU failure, stranded wife and kids in the Minnesota cold. This issue is not fixed.
The vehicle lost its ability to charge via AC power sources (level 1 and level 2), and the "Check vehicle electrical system" warning appeared on the dash. When using an OBD scanner, DTC P1E01 was present. It was inspected by a dealer, who informed me that the ICCU is in need of replacement, despite this component having been already addressed by a previous recall. Unfortunately the replacement component is backordered and there is no ETA available on the fix. For the time being I am limited to level 3 DC fast charging, which is a major inconvenience but does not represent a safety risk to myself or others.
We had the Internal Charge Control Unit replaced due to a warranty recall a couple years ago and it failed again on Dec. 23, 2025. The car has been at the dealer ever since, waiting for a replacement ICCU. The car refuses to charge and the dealer has diagnosed the issue as a faulty ICCU. There were no warnings or problem indicators prior to failure. This is our only vehicle, so while there was no safety issue, there is definitely a convenience issue. We had to obtain a loaner.
The ICCU component popped and blew seconds before I entered the on ramp for an interstate. My car immediately entered "turtle mode" and capped my speed at 10 mph. I crossed 4 lanes to get out of the turn ramp and get to a parking lot. The car alerted and stopped driving as I pulled into the lot. The car provided no warning before and has the 3 prior software recall fixes. It was unsafe for the car to suddenly stop working. 30 seconds more and I wouldn't have been able to pilot the car to a safe spot. Dealer has car and confirmed that the ICCU is blown and destroyed the 12v battery, which is less than a year old. They were willing to provide it to you. It is still at the dealership, as Hyundai national stopped shipping replacement ICCUs apparently in January.
Vehicle stopped charging and will not charge using a level 1 or level 2 charger. It will charge at a level 3 charger only. Took it to a Hyundai dealership and they did a software update and said it was fixed. Took it home and still would not charge. Took it to another Hyundai dealership and they said it was an ICCU issue they had been seeing and it would need to be replaced. I have read from many other Hyundai Ioniq 5 owners about the ICCU being a weak point in the car and having to have it replaced, some multiple times. When I tried to charge with my level 1 charger at home, it tripped the breaker, which is concerning. The message on the dash was simply, "check battery system".
While driving, the vehicle displayed a “Check Electrical System” warning and experienced loss of propulsion power. The vehicle became inoperable and required towing. The Hyundai dealer diagnosed failure of the Integrated Charging Control Unit (ICCU), a known failure point on this platform. The ICCU is currently on backorder with no confirmed repair date. This failure creates a serious safety risk, particularly if it occurs at speed or in traffic. I no longer feel the vehicle is safe or reliable to operate.
High-voltage battery system failure causing complete loss of propulsion. Vehicle entered "turtle mode" (reduced power warning) at 25% charge, then became completely immobile — unable to move even on flat surface. This has occurred multiple times. Charging system displays "fully charged" within one minute while vehicle dashboard shows 60% — clear battery management system malfunction. Vehicle has been undriveable and awaiting battery replacement for over a month at this point with no information on when the battery will arrive or be in stock. This is a known widespread defect in Ioniq 5 vehicles. Multiple owner reports document the same battery system failures, extensive reports of ICCU failures, and Hyundai's solution is to replace these failing components with the same component that fails repeatedly in other vehicles. No permanent fix or design change has been issued. This is a critical safety defect. Vehicle becomes completely immobile without warning — total loss of propulsion in traffic creates immediate crash and stranding risk. False charge readings mean the vehicle cannot be trusted to complete any trip safely. I have been left stranded multiple times on the turnpike of 80mph speed limit due to sudden total system failure. Hyundai has not resolved the root cause. They continue replacing batteries with the same defective system. This vehicle is fundamentally unsafe and unreliable. I should not be required to drive a vehicle with a battery system documented to fail catastrophically and repeatedly. Service records and repair invoices available upon request — vehicle currently at dealer awaiting battery replacement.
ICCU failed 12/29/25, car inoperable and towed to dealer. Luckily this was in my garage , had it been on the freeway it would have been very dangerous and car goes into limp mode. Car red battery light and made chimes. Only has 25,000 miles on it. Has been at dealer since then with no resolution update.
After having service done for the past two ICCU recalls months and months ago, I’m driving along today and hear the loud pop that everyone else reports. My car immediately went to a reduced power state where I was able to limp a bit further until I lost all power. I had to have the vehicle towed (by a wheel lift/dolly equipped wrecker - do not allow a flatbed they’ll drag your car into the truck) to the nearest dealership and now await to hear how long I’ll have to be without it.
The ICCU in my car has failed twice, within an 8 month period. (this submission is to report the 2nd occurrence) At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.
The ICCU in my car has failed twice, within an 8 month period. At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.
While stopped at a stop light, "check electrical system" warning flashed on instrument panel without any prior warning or malfunction. I was only able to move the car about 50 feet before all power and controls failed. I was in a middle lane and was barely able to move the car out of traffic. Tow truck driver with a large jump start battery pack was able to give it enough power for me to crawl it onto their flatbed, my small lithium jumpstart pack was only enough to get the rest of its doors unlocked. Battery temperature was about 30 degrees F, state of charge 75 percent, had been driving from home less than 10 minutes, car had been sitting outside for a few days. Problem diagnosed as ICCU failure by dealer service department, now waiting on replacement part to complete repair.
INCIDENT DESCRIPTION: On November 24, 2025, while driving at ~60 mph on NYS Route 17 (highway) with ~15% battery charge, my 2023 Hyundai IONIQ 5 suddenly entered limp mode and lost motive power. The high-voltage battery state of charge dropped instantly from ~10-15% to 0%, triggering error code P1B9600 (HV battery cell imbalance—cells failing to charge/discharge properly). I was unable to fully remove the vehicle from the roadway. My elderly mother was a passenger; a passing tractor-trailer came within 1 ft of striking us when disabled. NY State Police responded (report available). Required $300 tow to the Hyundai dealer, stranding us 150 miles from home.//PRIOR RELATED FAILURES: 1. November 14, 2025: Stranded due to ICCU failure (recall 24V‑868 related) (stranded on NYS State Route 444). 2. September 15, 2025: Same P1B9600 code/limp mode/power loss; stranded in the middle of active travel lane of NYS 444; NY State Police report filed. 3. August 2025: Initial HV battery-related sudden power loss; stranded on Interstate 90 Eastbound (Erie, PA area). Despite repairs (September 2025 ICCU/"limp mode" software updates; October 2025 ICCU/high-voltage fuse replacement under recall 24V‑868), defects persist. The vehicle charge rate also appears low and the battery consumption rate seems high.// CURRENT STATUS: Dealer (Vision Hyundai) confirmed high-voltage battery pack defective, requiring full replacement. Vehicle purchased new October 2024, under warranty. In service since mid-November 2025 (>30 days downtime). Provided loaner now, but prior rentals unreimbursed.//SAFETY RISK: Repeated sudden power losses create extreme highway crash risk, especially with vulnerable passengers. I am a licensed professional mechanical engineer, and can provide technical logs, repair orders, police reports upon request.The issues I have experienced appear to be linked to ongoing ICCU/HV system issues in IONIQ 5. I respectfully request expansion of the recall investigation.
While driving on the freeway I heard a pop and a saw a warning notification on the dashboard to check the vehicles electrical system. This was followed by a warning that power was limited which resulted it the vehicle speed decreasing to 30mph, and finally a notice to stop the vehicle immediately. All of this occurred in about 5 minutes time. Thankfully, I was able to pull over to the side of the road without an accident. After this the vehicle became inoperable including hazard flashers. I had to wait on the side of the freeway for about an hour to get a tow. The vehicle was towed to a dealer which confirmed that the ICCU and high voltage fuse were faulty. My safety during this process was put at risk because A) during a snow storm I had to pull the vehicle over to the side quickly across 4 lanes of traffic and B) then remain parked on the shoulder with limited ability to notify other drivers that I was on the shoulder. The dealer has confirmed the failure, the vehicle is available for inspection, and the manufacturer has not inspected the component.
ICCU failure, confirmed by dealer. Vehicle was parked in garage connected to charger. The ICCU fuse blew, and the house breaker was tripped. The vehicle failure also ruined the Grizzl-E EVSE (charger).
Car won't charge on Level 1 charging; it popped the GFCI in my garage and now no longer charges on level 1 (regular slow AC charging).
The Integrated Charge Control Unit failed despite having all related recall repairs/actions implemented. Failure occurred while pulling into a parking place after completing level 2 charging to 80%. The failure has not yet been confirmed by the dealer, but all common symptoms match this failure including hearing a pop sound from the rear of the vehicle followed by “Check Electrical System” indication and limited distance low power, low speed mode. Had this happened while driving at highway speed, the sudden loss in power and speed could have been dangerous to respond to and get off the highway safely. The vehicle is scheduled to be inspected by the dealer shortly.
Vehicle warning alarm came on with message to immediately pull over and check power supply. Towed car to dealer where ICCU and fuse were replaced. This after 1-2 recalls were completed.
Was driving on highway and started receiving error messages for "check electrical system". Car speed dropped to max of 45mph while actively on a highway. Was able to pull off an exit but car needed a 55 mile tow to the closest dealer. Dealer has identified that the ICCU needs to be replaced but has no timeline as the item is on back order. Car is model year 2023, purchased in February of 2023 and has 22,000 miles on it.
This morning I heard a "pop" sound from the back of my 2023 Ioniq 5. A short while later a warning message appeared about the cars electrical system. A minute or two later a "Stop Vehicle and check power supply" message appeared. The infotainment screen said "A possible condition has occurred with your vehicle. A full system check is recommended TODAY." This is likely a malfunction of the ICCU. I have already taken this car in 2 or 3 times for recalls related to the ICCU, including one dealership visit within the last 30 days. As this is an electrical vehicle, electrical problems could leave me stranded. Without propulsion I would be at risk of getting hit on the highway. The same error message appeared at the service center. The car has been at the dealership all day, and I don't expect to get it back anytime soon. There was no warning of the failure before today.
The iccu failed causing the vehicle to suddenly go into limp mode
Was driving in Bellevue, WA leaving a parking lot. Heard a "pop" sound, and immediately had a "Check Electrical System" warning come up on the dash. From previous experience in 2024, was aware this requires immediate dealer inspection, so started driving to the dealer 6 miles away. After less than a mile, lost most power but was able to drive slowly into an office parking lot. Called Hyundai Roadside Assistance who sent a flat bed tow truck to transport the car to the dealer. ICCU was replaced in May 2024 after similar symptoms. The current ICCU (which is likely the failed component) was in service for less than a year.
These cars had an open campaign earlier in the year to check for faulty ICCUs. Mine was check in Jan and deemed to be good. In early Feb I was driving home alone late at night and suddenly I was unable to go faster than 20mph and in a matter of minutes the car shut off. It had to be towed and the dealer informed me the ICCU failed. It was very scary and extremely dangerous. This has been happening so often with the Ioniq 5's and there should be a mass recall.
On March 20, 2025, my 2023 Hyundai Ioniq 5 displayed the error "Stop check vehicle power supply" and abruptly shut down during rush-hour traffic, leaving my young son and me stranded on a heavily congested bridge. Immediately, the car’s display went dark, doors wouldn't unlock, and the gear shifter was immobilized. With no emergency functions available, we were completely trapped. On a slight incline, I had to continuously hold the brake pedal to prevent rolling forward into increasingly aggressive traffic, making an already frightening situation terrifying for my child. Police arrived but struggled to assist preventing the car from moving. After several tense minutes, the dashboard briefly flickered back on, enabling me to unlock the doors. AAA identified a dead 12V battery, replaced it at my expense, but the critical error persisted, causing another complete shutdown shortly thereafter. The vehicle was towed to Hyundai of Bedford, where technicians diagnosed the issue as a failed ICCU and fuse, parts that are now backordered due to high number of vehicals having this same issue. Alarmingly, Hyundai plans to replace these faulty parts with identical models, despite my vehicle having completed all recall updates. This means the dangerous malfunction could occur again without warning, posing ongoing severe safety risks to my child, myself and those around use. This deeply traumatic event exposed critical vulnerabilities in the Hyundai Ioniq 5, especially dangerous for families, elderly drivers, or anyone caught in similar emergencies. The absence of functional basic safety measures left my son and me unnecessarily vulnerable. My trust in this vehicle and any thing using the same ICCU is permanently broken. Hyundai urgently needs reliable, redundant safety systems to prevent such life-threatening scenarios. Until then, we cannot feel safe or secure in these vehicles.
After all of recall software updates were applied the ICCU still failed with no warning beforehand and resulted in power and propulsion failure.
I purchased this vehicle in 2023 I have had multiple problems with loss of power ICCU SOFTWARE UPDATES 2-3 per year. . Now my vehicle has been in the dealer for 31 days. Needs a new ICCU and Fuse. No parts no one will tell me when I will get my car fixed. There are 6 other Hyundai ionic 5 Cars sitting with no parts or repairs in sight. I want out of this vehicle it’s a Lemon Every time it has broken down I needed to call a tow truck. Can someone at the federal safety agency HELP ME? [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Upon attempting to merge onto a highway, the vehicle lost acceleration and a warning message appeared on the dash stating "Stop vehicle and check electrical system". Car speed was limited to 28 mph. I was able to exit and get the car to the dealership. This was on January 29th, 2025. Car was finally returned to me with a new ICCU on March 19th, 2025.
The first time the "aux" battery was not charging completely. 2nd time pretty much same issue, they claimed to have performed a software update, 3rd time warning lights came on "Problem, check electrical system" ..something like this. They told me to bring the vehicle to the dealership. After reading the problems stem from the ICCU, I decided to call them to ask if I should tow it in, due to all the warnings. After this we could not even get into the vehicle or drive it. Took us and the tow driver 4 attempts to get it out of the garage, down driveway and it had to be pulled onto the flat bed. They agreed and said that if there were any tow fees, they would pay them. Furthermore they said they would supply a vehicle to use while mine was being repaired. This was on Jan 25th, they still have not returned my vehicle, claiming they are waiting on parts, I've had to call them to check on it, this week NO contact what so ever.
Was driving the car and electrical system failure alert came on. Could not drive over 20 miles an hour on highway and then car just died once I got on side street
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