Driving the car at 30 mph, the vehicle suddenly failed to accelerate while pressing on the gas pedal. I was forced to pull over as soon as possible to try to resolve the issue at hand. Thankfully, the breaks still worked and I was able to come to a full stop, turn off the car, and restart the car. There were no warning lamps/ messages that appeared before or after the time of the incident. (Incident occurred Aug 11) This is the second incident that my car's acceleration failed while in the middle of driving. Previously, this had happened while on the freeway during stop and go congestion (Oct 2025). This is a severe life-threatening safety concern as the failures have happened while the car is in motion during traffic. When I have taken the vehicle in for an inspection and diagnosis after the first incident, the Hyundai dealership was not able to reproduce the problem (Oct 2025) and therefore, could not provide any corrective services. I have not taken it in again for the second incident. The car is available for inspection upon request.
No injuries · No fire · No crash
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 freeway while trying to merge in a difficult interchange. 2 cars almost hit me from behind when my car suddenly stopped. I was however in complete control of the situation. 3. Rear Backup camera stops to much when person is 8 feet past my car. It just suddenly STOPS even when person is walking away from the car. Snaps my neck too. Also, stops at night after rain. I believe it sees a reflection and thinks it is a hazard.
No injuries · No fire · No crash
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 ICCU/DC-DC converter dropout. This type of failure is known to cause loss of power and has been documented in NHTSA investigation PE23-011 for other Hyundai EV's. The dealership states they cannot replicate the issue and refuses further diagnostics. Hyundai corporate is deferring entirely to the dealership and will not authorize a loaner or confirm reimbursement, leaving me without transportation. They also stated they cannot commit to any repair unless the failure happens again despite the clear safety implications. This failure mode can cause sudden loss of motive power, which poses a serious risk if it occurs at highway speeds. I am reporting this because the vehicle is unsafe to operate, the failure was severe, and Hyundai is refusing to investigate the root cause unless it reoccurs. I am requesting NHTSA review this incident as part of the ongoing concerns regarding ICCU/DC-DC failures in Hyundai E-GMP vehicles.
No injuries · No fire · No crash
NHTSA COMPLAINT — SHORT VERSION I am reporting a persistent, unresolved, safety-related steering defect in my 2025 Hyundai Ioniq 6 (leased 10/12/2024). Beginning in September 2025 at approximately 15,412 miles, the vehicle exhibits: (1) uncontrolled steering wheel shifting left and right at highway speeds; (2) hard pulling to the left when accelerating or decelerating; and (3) the vehicle swaying or jerking within its lane without driver input. I described the issue to the dealer as "pretty dangerous to drive" — this language is documented in Repair Order #XXX. Despite 6+ documented repair attempts over 9 service visits from September 2025 through May 2026, the defect remains unresolved. Repairs attempted include: two 4-wheel alignments, road-force balancing, steering angle sensor calibration, front camera calibration, new front view camera installation, and a complete steering gear box (R-MDPS) replacement. The vehicle was out of service for 129 documented days. CRITICAL ADMISSION: Dealer Repair Order #XXX(11/5/2025) explicitly states that Hyundai's Technical Service Bulletin procedures for this steering defect only apply at speeds of 40 MPH and below, and that "above that speed there are too many variables." The defect occurs at highway speeds above 40 MPH. This is a written admission that no manufacturer-approved repair procedure exists for the defect as experienced. Hyundai Techline Case #XXX was opened in January 2026. After Techline involvement and new camera installation, the technician's own repair order states "concern still present" after road testing. Hyundai Motor America corporate case #XXX was opened, and Hyundai has now stated they cannot process a buyback or lemon case. The vehicle remains unsafe to operate at highway speeds INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6
No injuries · No fire · No crash
What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle's cellular connectivity becomes 100% non-functioning until head unit reset. This occurs some days after the car is parked in an area without cell coverage and is then driving into cell coverage area, even directly under cell towers. It appears to give up trying to connect when parked out of range and never attempts to reconnect. until manually reset. How was your safety or the safety of others put at risk? Without in-vehicle connectivity, automated crash alerts / location information is unavailable. There's NO indication there's a problem unless certain information screens are visible, and only then, the indication is the lack of any connectivity signal level bars (a missing very small and dim icon) Has the problem been reproduced or confirmed by a dealer or independent service center? Yes via live phone assistance with Hyundai bluelink support. They suggested the manual reset and observed the re-establishment of connectivity. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Not yet. I had the car in for a recall, but the service department said there was nothing they could do until Bluelink provided a fix. There's no fix announced. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No, just the missing icon if you know where to look on certain screens.
No injuries · No fire · No crash