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.
full bulletin at NHTSA ↗2024 Hyundai Ioniq 6 electrical problems
moderate 17 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
17
Recalls
0
Avg fix
$850
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
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.
full bulletin at NHTSA ↗Hyundai is extending the warranty coverage for the Integrated Charging Control Unit (ICCU) and ICCU fuse 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. Follow the flowchart in Technical Service Bulletin (TSB) 26-BE-010H to check for an active or stored occurrence of any Diagnostic Trouble Code (DTC) that requires replacement of the ICCU and replace the ICCU and ICCU fuse if necessary. Some vehicles may have an active DTC that requires ICCU replacement. Please note that any vehicles under 15 years/180,000 miles are covered by this TSB, even if vehicle is within High Voltage Warr
full bulletin at NHTSA ↗Hyundai is extending the warranty coverage for the Integrated Charging Control Unit (ICCU) and ICCU fuse 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.
full bulletin at NHTSA ↗Hyundai is extending the warranty coverage for the Integrated Charging Control Unit (ICCU) and ICCU fuse 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. Follow the flowchart in this bulletin to check for an active or stored occurrence of any Diagnostic Trouble Code (DTC) that requires replacement of the ICCU and replace the ICCU and ICCU fuse if necessary. Some vehicles may have an active DTC that requires ICCU replacement.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report a pattern of ICCU (Integrated Charging Control Unit) failures that persist even after Hyundai's recall software update. The ICCU cuts drive power suddenly, sometimes with a loud POP sound, forcing the vehicle into limp mode at 15–25 mph or complete shutdown. One owner experienced this after the recall was supposedly completed; another heard a loud bang, then the car slowed to 24 mph before total failure.
Separate but equally serious: 12V battery failures occur without warning, even when voltage readings appear normal initially. One car failed under 500 miles with the main battery at 70% charge. After the ICCU software update, another owner's 12V battery died three times over three weeks while parked. When the 12V fails, the entire vehicle becomes a brick—no starting, no door locks, no app access, no emergency flashers. One owner was stranded in 10-degree weather with no heat and no warning lights.
Owners also report brake unresponsiveness (vehicle rolling backward despite brake application), sudden loss of acceleration power without warning, and horn failures at low mileage. The timeframe between ICCU software recall and recurring failures is short—as little as weeks. Hyundai dealers cannot reverse the software or explain what went wrong. One dealer blamed a "bad part" instead of investigating root cause. Hyundai Motor America has refused to acknowledge a suspected connection to the Bluelink app despite dealer diagnosis suggesting it. Owners cite safety risk: if ICCU failure happens at highway speed or in a remote area, the disabled vehicle offers no warning and limited recourse.
Same Hyundai Ioniq 6 electrical reports on nearby years: 2023 · 2025
Failure modes owners describe
ICCU (Integrated Charging Control Unit) failure causing loss of drive power
The ICCU unit fails, cutting drive power and forcing the vehicle into limp mode at 24–25 mph or complete shutdown. Multiple owners report this occurs despite having had the ICCU software recall performed. Failures happen without warning or with only dashboard warnings ('check electrical system,' 'critical error'). Owners have heard a loud POP sound moments before loss of power.
When: Between 2,900 and 26,000 miles; some after recall software update installed (January 2024 for at least one owner); one failure occurred after several days of below-freezing temperatures
Symptoms owners cite: Loss of drive power while driving; Vehicle forced into limp mode, max speed 15–25 mph; Dashboard warnings: 'check electrical system,' 'critical error,' 'power system failure,' yellow turtle light; Loud POP sound under car before power loss; Car requires full shutdown and restart to regain responsiveness; Complete shutdown/inability to start
Codes mentioned: Check electrical system warning, Power system failure warning, Critical error
Repairs/costs cited: ICCU replacement required; one owner waited a week for the part; one dealership claimed unable to reverse the software update and refused to replace ICCU despite repeated 12V battery failures post-update
Recalls/TSBs owners mention: ICCU software update recall issued; however, owners report failures continue after recall completion; Hyundai has not publicly identified root cause; one owner notes the software update appears to have caused 12V battery drain issues rather than fixing ICCU problems
12V battery failure and depletion
The 12V auxiliary battery fails completely or drains repeatedly despite showing normal voltage readings initially. One owner's battery failed under 500 miles with the main battery at 70% charge and normal voltage levels (12.5V off, 13.25V on). Another owner experienced the 12V battery dying three times every ~3 weeks after the ICCU software recall was applied, with the dealer unable to diagnose the root cause. When the 12V battery fails, the entire vehicle becomes disabled—no start, no door locks, no app/key fob access, no climate control, no warning flashers.
When: Under 500 miles (first failure); after 25,000+ miles (some failures); recurring every ~3 weeks post-software update for one owner; during cold/freezing conditions for at least one owner
Symptoms owners cite: Complete inability to start vehicle; Vehicle undrivable despite main battery at acceptable charge; No warning lamps or messages before failure; Unable to unlock doors (key fob and app non-functional without 12V power); Complete loss of electrical systems (no flashers, no climate, no steering assist, sticky steering wheel); Repeated depletion while vehicle parked overnight
Codes mentioned: 12V battery voltage normal (12.5V off, 13.25V charging) despite failure
Repairs/costs cited: Battery replacement; however, replacement battery also died in at least one case; jump-starting required to move vehicle; one dealer claimed issue was 'just a bad part' with no root-cause investigation
Recalls/TSBs owners mention: Hyundai dealer diagnosed one failure as caused by Bluelink (connected app); Hyundai Motor America refused to acknowledge this diagnosis or provide any documentation, testing results, or warranty clarification; offered one month of payment instead of acknowledging systemic defect; one owner reports Bluelink is suspected root cause across Hyundai EVs using the system
Braking system failure during one-pedal driving (iPedal mode)
Owner in iPedal mode released the accelerator and the car's regenerative braking system did not activate. The vehicle proceeded through a red light and struck another vehicle, leading to power system failure warning and reduced power mode.
When: While actively driving in intersection
Symptoms owners cite: Braking system did not activate when accelerator released in iPedal (one-pedal) mode; Vehicle proceeded through red light; Power system failure warning appeared; Power reduction; vehicle could only move at ~3 mph
Codes mentioned: Power system failure warning
Repairs/costs cited: 12V battery was completely depleted; required jump-start to operate vehicle
Recalls/TSBs owners mention: Owner states issue was 'supposedly' addressed in a recall, but failure recurred during active driving
Brake unresponsiveness and vehicle rollback in park/drive transitions
Owner attempting to place vehicle in drive from park—foot on brake pedal—car continued rolling backward despite brake application. Repeated attempts to shift into drive failed. Vehicle only responded after full shutdown and restart.
When: While backing out of parking space
Symptoms owners cite: Brake pedal pressed but car continues rolling backward; Shift into drive does not engage; Vehicle unresponsive until power cycled off and on
Recalls/TSBs owners mention: Vehicle had previous ICCU updates applied; no dealer diagnosis reported
Horn failure (both high and low tone)
Both the high and low tone horns stopped functioning, eliminating the ability to warn other drivers of hazards or lane encroachment. One horn failure occurred at 7,500 miles; another owner reported sudden horn failure with no warning.
When: At 7,500 miles (one case); timing not specified for the other
Symptoms owners cite: Both high and low tone horns inoperable; Unable to alert other drivers; No warning lights or messages before failure
Repairs/costs cited: Horn assembly replacement under warranty; estimated repair date 11/22/24 for one case; repair completed at no cost for another
Recalls/TSBs owners mention: Warranty replacement available; dealer noted horn failure is a safety issue; owner reports horn failures are common across multiple Hyundai models and Ioniq variants
Loss of acceleration/motor power without warning
Vehicle lost acceleration power while driving below 45 mph. Acceleration gauge zeroed out with no warning lights or sounds. Steering became stiff. Power restored only after full vehicle restart.
When: At 2,900 miles while at 37% state of charge
Symptoms owners cite: Complete loss of acceleration/motor power; Acceleration gauge display zeros out; Steering wheel becomes very stiff ('sticky'); No warning lights or sounds before failure; Power only restored after vehicle restart
Repairs/costs cited: Not yet inspected
Synthesized from 17 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 10 most recent
The ICCU failed on my vehicle after 25,000 miles on a 2024 model year car. Driving on a cold and wet night, after pulling away from a stop sign, we heard a large POP and then dashboard lights indicating an electrical system problem. Apparently the sound was a fuse blowing, and then the car went into limp mode. We were able to drive at approximately 24 mph for about 5 minutes before the car told…
The power system failure warning came on as I was driving up on an intersection. WhenI released the accelerator because I was in i-pedal mode (one pedal driving), the cars braking system did not activate. Consequently, I ran the red light. The car power was reduced, and I was able to pull into the parking lot of a strip mall as a police vehicle pulled behind me. After explaining our situation…
Both the high and low tone horns on the car failed with 7500 miles on the vehicle. This has caused the inability to warn other drivers of lane encroachment or alerts. The part is being replaced under warranty currently waiting on the part to arrive. Estimated repair date 11/22/24 As a member of multiple Hyundai Ioniq groups this seems to be a common failure across more Hyundai models then just…
As I was driving home from work, a loud POP went off under my car, and sirens began to go off. I was given a critical error, and told to immediately contact a dealership. My car began to slow, and would only go 25 mph. Luckily for me I was within a few miles of a dealership, but if I wasn't so fortunate this would have been a much larger issue. The ICCU has failed, despite already getting…
I received the safety recall letter and attempted to make an appointment with Modern Hyundai of Concord, NC. Service appointments were listed online beginning at the end of August and had available time slots, I wanted to check on any further availability so I called. Once I had the service department on the phone I was told that the earliest they would be able to schedule me is in October. I…
I own a 2024 Hyundai Ioniq 6 that experienced a complete 12V battery failure at under 500 miles of use, despite showing normal voltage levels (12.5V off, 13.25V while attempting a jump). The vehicle was undrivable and could not start, even though the main battery (MV) was at 70% charge. There were no prior warning lamps or messages before the failure. The vehicle had to be towed and left…
1. The HORN suddenly stops working. This happened 3x in a 6 month span. The first time the horn wouldn't work all day. However, next day it did. Second time it didn't work for 3 days. Last time it stopped working completely just before Memorial Day weekend. I have read it is a known issue in Hyundai Ioniq 6 forums. 2. Forward Collision Warning is to Invasive. Once it even stopped on the…
This incident just happened around 9:50pm. I have a 2024 ioniq 6 SEL with 2900 miles. I lost power to my motor while going below 45 mph. The gage that shows acceleration and recharge, zeroed out, showing absolutely nothing. Once I came to a complete stop, I had to restart the car for the accelerator to work. I am on 37% charge. This is not a low charge. There were no warning lights or sounds. I…
I experienced a safety critical failure in my 2024 Hyundai Ionic 6. While attempting to start the vehicle, the car displayed a red 12 Volt battery warning light, a battery discharge warning, and then refused to enter ready mode. The vehicle would only shift into neutral and was completely undrivable. After sitting for many hours, the vehicle started again, which is consistent with an intermittent…
Recall 272 - ICCU Ioniq 6 : ICCU fuse and update were required. Dealership ONLY did update. Did not replace fuse. Vehicle was "updated" for Recall 272 on 2/19/2025. Jenkins Hyundai Service Mgr, Savannah, confirmed on 5/18/2026 that this information is correct. In March 2026, the power seating failed to operate. This is directly related to Recall 272. However, when the vehicle was taken in for…
Had electrical trouble with your 2024 Hyundai Ioniq 6?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2024 Hyundai Ioniq 6?
It's a documented issue but not catastrophic. 17 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2024/Hyundai/Ioniq 6.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.