Hyundai Ioniq 5

"12 volt battery discharges when parked. Took 7 visits to Hyundai before problem was fixed. Then we got a recall on the problem. We went without the car for 2 months."

"12v battery died after only 12000 miles so kia updated softtware and replaced battery at no charge"

"Battery failed, resulting in me being stranded. Dealer kept car for several days. Cause was previous battery damage due to software issue that was resolved during recall fix."

"The 12V battery light comes on for a few days alerting us not to drive and then goes away."

"Many months"

""It started after Hurricane Helene. When I left it plugged in that night, the car fully charged, but after the power went out, the LEDs on the charging port remained on and discharged the 12 volt battery. After I recharged the battery, it continued to go bad. I learned that Hyundai's factory-installed 12v batteries are not suitable for electric vehicles. Mine was replaced under warranty.""

"Battery was dead, had to replace it. Car would not start!"

"12V battery died 23 months into lease and took dealership nearly a month to rectify!"

""The 12v battery needed to be replaced last summer as it was being drained by charging apps that were calling it. Deleting them, and replacing the battery at no cost to me (including use of a loaner car) solved the problem.""

"800v battery to charge 12v system failed repeatedly. Car towed 4 times. ICCU replaced. 12v battery replaced."

"The 12V battery has drained itself a number of times, requiring a jack-start to get it going again. On one occasion the 12V battery went completely dead and needed to be replaced."

""System that charges the 12V battery is flawed. The 12V battery dies and will not hold a charge, and the car will not start with it not working. Hyundai has not fixed the problem, just keeps replacing the battery after keeping the car in the shop for days each time. I am on my fourth battery. Considering trying to invoke the lemon law. Hyundai has not been able to fix any of the problems encountered with this car.""

"Control system for charging the 12 volt failed resulting in failure of all displays and controls."

""Car wouldnt start, requiring a tow to dealer. The tow operator got it to start and the dealer couldnt duplicate problem, even after keeping the car for 2 weeks. It happened a second time and dealer advised me to not allow any attempt to start it. The 12 volt battery needed to be replaced, for the second time.""

"There was a defective cell in the battery which caused the vehicles electrical systems to malfunction and be completely unresponsive"

"Had a bad cell and didnt charge or hold charge properly"

""I had just left the dealership after tending to the recall of 12V battery issue. Within 30 minutes, the 12V battery failed. I waited 2 months for installation of the new battery.""

"The battery stopped working when the I The battery stopped working when the above mentioned ICCU box failed."

""Yes, two dead 12 volts caused by ICCU and not covered?!""

"two units have failed and needed to be replaced"

"In January 2025 the ICCU stopped working and the car had to be towed to the place where it was purchased for a repair. I was without the car for 2 months. It is a well known problem with most Ionic5's."

"Vehicle gave notice of electrical system problem and to stop vehicle and have it towed to dealer. After many delays and problems with the dealer (Big Island Motors) the ICCCU unit was replaced."

""Works fine now, but had to take it in for repair because it wouldn't release after chraging complete.""

"Level 2 Home charging: The charging port would overheat and shut down completely or reduce charging power from 11 KWH to 7 KWH. Recall. Software update performed. Now when charging the charging power level drops from 11 KWH to 9 KWH but does not shut off. When charging during the winter ( ambient Temp 40f) the charging power level will remain at 11 KWH during the entire charging session. This issue is considered repaired."

"12 volt battery that runs onboard heat and electronics would not charge consistently. Needed a new battery and a software update. The problem is now fixed. Recall was known as an ICCU update."

"Recall issue. ICCU needed to be replaced. Car out of service for 1 month"

"The software update, as first part of ICCU recall campaign, shorted its AC charging circuit, which also damaged my home charging wiring/breaker upon the next overnight charge. Verified it was car and not charger by testing with different public chargers. DC Fast charging still worked, fortunately, since I had to wait 5 weeks for replacement ICCU. Picking up repaired car at dealership this weekend. Bought this used car knowing that 12V accessory recharging was an issue, but Hyundai had just announced recall plans and owners raved on everything about the car (except the ICCU)."

"The car spent 1 month at the dealership waiting for a new ICCU after I was stranded at work due to the ICCU failing and bricking the car."

""Would not take charge from level 2 public charging stations, twice on same trip. Required lengthy tow to dealer. Resolved with software update.""

"The ICCU malfunction and safety recalls. The last "fix" done on 1/9/2025 caused the ICCU to fail on 2/22/25. My ioniq 5 was in the shop 2/28 to 5/7 waiting for ICCU to ship. What do I do the next time there is another ICCU safety recall. Ignore it to avoid a fatal ICCU "fix" or die in a car crash BECAUSE I ignored it. 2 12V batteries also replaced and NOT covered!"

"ICCU unit which handles charging the 12 volt battery failed. Has been a problem with Hyundai so replacement unit was not immediately available. Took three weeks for unit to arrive. Was repaired under warranty and Hyundai covered my costs for a rental while car was at dealer so I was satisfied by their warranty."

"Inverter failed and needed to be replaced..ended up being a recall situation"

"Same issue"

"Replacement ICCU part took more than 2 months"

"Changing station not working Changing stations crowded"

""There is a known issue with the rear hatch rattling. The dealership fixed it once already but it has returned. There's a new part available to fix it, I'm waiting for it to arrive.""

"Rear lift gate rattles while driving. Multiple attempts to fix by dealer did not work. Ended up trying an online hack - wrapping the rear lift gate strike plate in a layer of electrical tape. Works perfectly!"

"We had to take the Ioniq in twice for a rear noise which apparently was a common complaint. it was fixed the second time."

""Tailgate rattles incessantly. I have asked for it to be fixed I less than five times. Each time it improves, then gets worse again. Hyundai issued official repair instructions. The dealer performed these an it still rattles. When I contacted the national Hyundai support line the person who answered claimed to have never heard of the problem.""

""The back lift gate/door was squeaking incessantly. Replacement of the door catch solved the problem. In bad weather, especially in freezing weather, the cameras become non-functional - all assist functions shut off and one is driving without a rear view mirror. The headlights are poorly designed. On low and high beam, the lighted area is so far in front of the car that one must turn into the unknown dark when making a turn onto a side street or driveway. Also, the headlights are not focused on the right side of the road but light up equally both sides of a two lane road or three lanes of highway, which then impairs the vision of oncoming traffic.""