2024 Hyundai Ioniq 5 problems

Filed Oct 20, 2026 · Electrical · MA

The vehicle experiences catastrophic, recurring 12V auxiliary battery discharge and complete electrical system collapse due to a suspected repeating failure of the Integrated Charging Control Unit (ICCU). The vehicle was previously serviced for identical 12V power-loss failures and recall interventions in June 2025. Despite those prior repair attempts, the defect has recurred aggressively, resulting in four separate 12V battery collapse events in October 2026 (specifically on October 10, October 13, October 17, and a complete breakdown requiring a flatbed tow on October 19). This defect presents an extreme safety hazard: when the ICCU fails to step down high-voltage power to maintain the 12V system, the vehicle experiences sudden and unannounced loss of electrical power while parked or operating, risking a total loss of motive power, steering resistance, and exterior lighting in traffic. Diagnostic testing confirms internal 12V battery failure with normal resting parasitic draw, indicating the charging system root cause remains unaddressed despite prior manufacturer recall campaigns (such as Recall 272). The vehicle is currently at an authorized dealer awaiting diagnosis and repair.

Filed Oct 19, 2026 · Electrical · CO

"stop vehicle and check power supply" came in from nowhere, The vehicle was fully charged and there were no previous issues noted. The charge quickly dropped down to about 8% After that. I searched for the error message online and learned about a recall specific to this exact year, make and model. The recall was related to this exact issue. I towed it to a dealer at 7300 Broadway, Denver.

Filed Oct 5, 2026 · Electrical · CA

My partner drove it towards location about 1 mile away. Partner had driven it about 3 miles each way just a few hours earlier. Also drove it about 5 hours earlier in the morning, then I drove it about 10 miles. I charged it at home L2 (6.8kW) successfully hours before partner drove it and experienced the problem. Partner said it had low power after starting, then expected power. Drove about 1 mile then the Stop Safely and Check Power Supply displayed on the dash. Partner pulled over and parked the car and contacted me. I contacted Hyundai Roadside Assistance to have the car towed to the dealership. AAA towing service driver was able to start the car and drive it onto the flatbed. Drop off was around 8pm. Next morning, the dealer's service associate called me. They said the car was dead. I described the "Stop Safely and Check Power Supply" message on the dash. Service advisor tested and their scan determined the ICCU had failed P1A9096. On service invoice: FURTHER EXAMINATION FOUND THE INTEGRATED CHARGING CONTROL UNIT HAS AN INTERNAL FAILURE, Service Advisor said the ICCU was replaced with a newer (Jan 2026) version, confirmed “bad ICCU and fuse” and replaced both: ICCU assembly (36400-1XAA0-A) and Fuse-High Voltage (375F2-GI040). Service advisor completed the replacement on the same day they received it 9/30/26 and I was able to pickup that afternoon.

Filed Oct 1, 2026 · Steering · CA

My wife experienced a sudden loss/reduction of power-steering assist while driving the Ioniq 5 on [XXX], accompanied by warning indicators with "Check Driver Attention Warning (DAW) system". Vehicle required towing. Fault subsequently disappeared and could not be reproduced at the Hyundai dealership service department at Alexander Hyundai in Oxnard, CA. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 26, 2026 · Electrical · CA

Vehicle stopped responding at freeway speeds. Pedals didn’t do anything. Slowly pulled over and off freeway powered off car and back on again. Was able to continue driving home. Almost got stuck in the middle of the freeway

Filed Aug 21, 2026 · Fuel system · WA

Failure of the iccu. Needed complete replacement under warranty. Unable to charge via any AC charger. The iccu had already been repaired under an existing recall.

Filed Aug 19, 2026 · Electrical · CA

After car has been parked, when trying to start car , car turns on briefly saying 12 v battery low come to safe stop. Then car dies. Car isn’t in motion since it’s been parked. First time it happened I needed a tow truck and the tow truck needed to jump my battery. Since then battery keeps dying when trying to start this has happened every time I start the car since July 11 2026

Filed Aug 12, 2026 · Transmission · CA

Was driving to vegas, it was 103-107 degrees After fast DC charging drivetrain had issues that when pressing acceleration the car would have almost a loss in power that caused a stuttering movement. If forcefully driven, the error message drivetrain electrical system would pop up. Issue can be resolved but only after letting the car stay in park for 10-15 minutes after finished charging. Issue was repeatable but only if weather was hot enough. This shouldn't happen or at least warn the driver to not drive for a certain period instead of guessing the issue.

Filed Aug 11, 2026 · Body, Steering · CA · crash · 2 injuries

Going thru a parking lot to a drive thru at a fast food place, rounding a small curve at a very low speed then trying go to 1 st lane out of 2 lanes the car suddenly went out of control and accelerated to center pole. The pole was a barrier protecting the support pole for the canopy. The car front center hit the pole so hard that the front collapsed. The hood buckled in the center and the pole went half way to the windscreen. The air bags did not deploy. The driver got hit with steering or something in the chest and caused lot of pain for about 10 days. No internal injury was detected. The car was totalled. The car did not complain of any incident except the dash reported something binding when tried to back off from the pole. The car repair company declared it as write off including the auto insurance company. Police was called and they did not take any data no other investigation was done. We feel the car computer malfunctioned and caused the accident.

Filed Aug 3, 2026 · Engine · AZ

The car engine shutdown mid drive. One minute before the complete stop, the car was stalling every 20 sec or so, then the acceleration stop responding to the drive pedal. The car was gliding to a stopping point. The "Engine " warning was on the display. Afterward, the car was towed to the Earnhardt Hyundai North Scottsdale, where the service center could not recreate the problem. They concluded that is a non issue since they did not observe the same issue during the test and diagnostic.