This Problem Across All Years
What happened to me is a common problem with these models. I had an issue with the 12 V battery not being charged by the main battery as it should be. This led to a blowing of the main fuse which took out the ICCU unit. This seems to be fairly prevalent from what I can tell from online forums, and there needs to be a recall from Hyundai.
What happened to me is a common problem with these models. I had an issue with the 12 V battery not being charged by the main battery as it should be. This led to a blowing of the main fuse which took out the ICCU unit. This seems to be fairly prevalent from what I can tell from online forums, and there needs to be a recall from Hyundai.
The contact owns a 2025 Hyundai Ioniq 5 N. The contact stated that while driving at 40 MPH, the service battery immediate warning light illuminated. A dealer was contacted. The vehicle was taken to the dealer because the ICCU unit needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 8,000.
The contact owns a 2025 Hyundai Ioniq 5 N. The contact stated that while driving at 40 MPH, the service battery immediate warning light illuminated. A dealer was contacted. The vehicle was taken to the dealer because the ICCU unit needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 8,000.
While driving home, I experienced a sudden and complete power system failure in my Hyundai Ioniq 5 N. The failure occurred shortly after starting the drive, and was preceded by a faint "pop" sound. Within moments, the dashboard displayed the following critical warnings: Red 12V battery icon Red warning: "Stop vehicle and check power supply" Turtle icon (indicating limp mode / low power) Brake warning light ⚠️ The vehicle immediately entered limp mode, then fully lost power within approximately 3 minutes. I was able to safely pull into a nearby parking space before total shutdown and loss of power. Restarting the vehicle had no effect.
While driving home, I experienced a sudden and complete power system failure in my Hyundai Ioniq 5 N. The failure occurred shortly after starting the drive, and was preceded by a faint "pop" sound. Within moments, the dashboard displayed the following critical warnings: Red 12V battery icon Red warning: "Stop vehicle and check power supply" Turtle icon (indicating limp mode / low power) Brake warning light ⚠️ The vehicle immediately entered limp mode, then fully lost power within approximately 3 minutes. I was able to safely pull into a nearby parking space before total shutdown and loss of power. Restarting the vehicle had no effect.
After recent software update on 17 March 2025, the vehicle demonstrated unpredictable high acceleration. Vehicle is unsafe in E-shift mode. Vehicle can only be driven safely in automatic mode. Per a Hyundai communication: "there have been complications reported related to the Vehicle Control Unit (VCU) software that may cause momentary continued acceleration during the release of the accelerator pedal while the vehicle’s N e-shift feature is engaged, increasing the risk of a crash. Our records indicate that your vehicle, VIN [XXX] , has had this software update installed as the remedy for recall 275. Hyundai is currently investigating the root cause of this complication and will provide an update when available. In the meantime, Hyundai recommends all owners who previously received remedy repair for recall 275 NOT TO USE the N e-SHIFT Feature." INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
After recent software update on 17 March 2025, the vehicle demonstrated unpredictable high acceleration. Vehicle is unsafe in E-shift mode. Vehicle can only be driven safely in automatic mode. Per a Hyundai communication: "there have been complications reported related to the Vehicle Control Unit (VCU) software that may cause momentary continued acceleration during the release of the accelerator pedal while the vehicle’s N e-shift feature is engaged, increasing the risk of a crash. Our records indicate that your vehicle, VIN [XXX] , has had this software update installed as the remedy for recall 275. Hyundai is currently investigating the root cause of this complication and will provide an update when available. In the meantime, Hyundai recommends all owners who previously received remedy repair for recall 275 NOT TO USE the N e-SHIFT Feature." INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The 12 volt battery (which is less than 6 months old) died on two separate occasions in the span of 4 days. Each incident required a call to emergency roadside assistance for a jump start. This is a safety issue. If the 12 volt battery dies while driving, the car will display a warning message instructing the driver to pull off the road immediately and shut off the car. The car will also lose power and cease operating shortly after this message appears. After the second incident, I took the car to my local Hyundai dealer but after having the car for 12 days, the dealer stated it could not reproduce the problem and provided no service. This problem is identical to the problem that occurs on the regular Ioniq 5 and its sister model the Kia EV6 for which multiple safety recalls have been issued. Hyundai indicates that no recall has yet been made for the Ioniq 5N.
The 12 volt battery (which is less than 6 months old) died on two separate occasions in the span of 4 days. Each incident required a call to emergency roadside assistance for a jump start. This is a safety issue. If the 12 volt battery dies while driving, the car will display a warning message instructing the driver to pull off the road immediately and shut off the car. The car will also lose power and cease operating shortly after this message appears. After the second incident, I took the car to my local Hyundai dealer but after having the car for 12 days, the dealer stated it could not reproduce the problem and provided no service. This problem is identical to the problem that occurs on the regular Ioniq 5 and its sister model the Kia EV6 for which multiple safety recalls have been issued. Hyundai indicates that no recall has yet been made for the Ioniq 5N.