Hyundai Ioniq 5 won't shift problems

Filed Nov 9, 2026 · Electrical, Fuel system · CA

While driving at highway speeds on freeway, the vehicle suddenly presented warning message, "Stop vehicle and check power supply". Immediately after the warning appeared, the vehicle experienced a rapid loss of propulsion and entered a "limp mode", gradually losing power over the course of a few minutes as it limped into a safer location to wait for tow services. The sudden loss of drive power on an active freeway put the safety of myself and other motorists at risk, forcing me to navigate the vehicle off the roadway and onto a side street at an extremely low speed. The vehicle was subsequently towed to a certified Hyundai dealership. The dealership reported that the vehicle's battery was completely drained, leaving the car entirely unresponsive and unable to turn on. The dealership is currently inspecting the vehicle and has requested additional time to diagnose the root cause. The vehicle and its components are available for inspection.

Filed Sep 4, 2026 · Electrical · CA

ICCU failure. Car went into limp mode then towed to dealership.

Filed Jul 9, 2026 · Electrical · IL

On 5/27/26, when the car was parked in parking lot, received an alert on dashboard, "check electric vehicle system", when the car was turned on. The car would not shift in to drive or reverse so had to get towed to nearby Hyundai dealership. The EV system was recalibrated and test driven 122 miles to verify proper operation. Then on 6/23/26, when driving on road received an alert on dashboard "power limited". The car would not accelerate and had to get it towed again to same dealership. The dealership performed tests on ICCU and 12V battery but came back negative.

Filed Jun 24, 2026 · Electrical · WA

During routine driving, the vehicle suddenly displayed an electrical system. Error code followed several minutes later by a 12-volt battery error. The vehicle was stopped and turned off. When turned back on all warnings disappeared and vehicle was returned to service for approximately 3 MI before warnings appeared again. Vehicle was then parked as it entered limp mode with a maximum speed of 11 mph. manufacturers roadside assistance was called and arrived to jumpstart the 12-volt battery which resulted in the vehicle turning on but not charging despite sufficient charge in the high voltage battery. Vehicle was stranded in a secure parking lot after hours with Windows unable to be closed and doors unable to lock. The vehicle is immobilized due to being unable to put the vehicle into neutral to move it to a suitable location for a tow. Vehicle was certified by dealership as a certified pre-owned vehicle approximately 45 days ago. All listed recalls have been checked and no undue stress has been placed on the vehicle since purchase. Vehicle stranded to adults and one toddler in 80 plus degree heat without any ability to remove the car to a safe location or secure transportation to an appropriate business.

Filed Apr 30, 2026 · Electrical, Fuel system · CA

ICCU failure at 6,126 miles. Vehicle went into limp mode and had to be towed.

Filed Apr 29, 2026 · Electrical · GA

I tried to start car and it started but would not go into drive. A message saying "12v battery voltage low. Stop safely." Was on the screen. I turned the car off and back on and was able to drive home. Once home I tried to charge the car but it would not charge. However I left it plugged in and came back several hours later and the car had charged some. I started the car and the messages did not appear. The next day i went to drive the car and the car was totally dead. The auto key would not unlock the car. Thank goodness , I was not driving when the battery died. I took it to the dealer. This is the 2nd 12v battery I have had to replace in 4 years. The first replacement was covered under warranty. I asked them to try to identify the root cause of the 12v batteries dying so quickly and they claim it is only the 12v battery. I feel unsafe driving the car now knowing it could happen at any moment again, maybe while driving. I think the problem is related to the ICCU as my symptoms are very similar to other people with ICCU issues.

Filed Apr 20, 2026 · Electrical · CT

Vehicle unexpectedly ceased to work. A loud pop sound then a message to check electrical system. Vehicle reverted to “limp mode” leaving me at a max of 15 mph. Terribly unsafe and extremely, concerningly widespread ICCU failure across Hyundai EV models For 5+ years is unacceptable

Filed Apr 9, 2026 · Electrical, Transmission · AZ

There was sudden power reduced and turn to the limp mode(Turtle symbol popped up). After pull over my vehicle to highway shoulder, the vehicle became total power loss. Unable to drive anywhere. It was a dangerous situation for my family. We waited tow car and took my vehicle to Hyundai dealership which located close to my house. They diagnosed my car and after a day. They told me it needs to be replaced a ICCU assembly and Fuse. There was no ETA for the parts. They provided me a loaner’s car. After about 15 days, they fixed and I was able to take my car.

Filed Mar 27, 2026 · Electrical · OH

Based on all symptoms - loud pop followed by limp mode and electrical warning, and inability to charge -- iccu is busted.

Filed Mar 25, 2026 · Electrical, Transmission · FL

ICCU failure occurred while vehicle was operating at 30 MPH, after being charged the night prior and unplugged in the morning at 100% capacity. A sudden pop was heard, and the vehicle indicated that an electrical fault would require the vehicle to be shut down as soon as safely possible. The vehicle went into limp mode and would not exceed 25 MPH.