What 87 owners told NHTSA about the 2024 Hyundai Tucson Fuel Cell

Subject: Urgent Drivability Concern – 2024 Hyundai Tucson (6/22 Incident) Vehicle: 2024 Hyundai Tucson Date of Incident: XXX Trip Details: [XXX] to [XXX] (~160+ miles) Summary of Issue: During a long-distance drive on XXX, the vehicle experienced severe and consistent drivability issues that created unsafe driving conditions. Symptoms Observed: •Severe loss of acceleration / stalling behavior throughout the entire trip •No check engine light illuminated at any time •When pressing the accelerator: oTachometer increased (RPMs rising) oVehicle speed decreased or failed to increase appropriately •Significant delay in acceleration, especially when: oMerging onto the interstate oPassing other vehicles •Cruise control behavior: oSeemed to manage acceleration more effectively than manual throttle oHowever, still exhibited slow response when additional acceleration was required •Auto Start/Stop system: oSystem automatically disabled itself oWould not allow reactivation during the trip Safety Concern: This condition made it difficult and unsafe to: •Merge into traffic •Maintain appropriate highway speeds •Execute passing maneuvers Dealer Visit (Near [XXX]): •Vehicle was inspected after sitting for a couple of hours •Dealer reported no issues found •However, the problem was persistent and clearly present during operation under driving conditions Took vehicle to a dealership in Raleigh and asked that they look at the fuel injectors. They determined that all 4 injectors were failing and replaced them under warranty. Concerned that Hyundai America has not issued a recall as driving the vehicle with this issue creates a serious safety concern that would lead to injury or loss of life INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11748709

While driving at approximately 70 mph on a highway under normal conditions, the vehicle experienced a sudden loss of engine power. A check engine light illuminated at the time of the failure, and the vehicle was unable to maintain normal acceleration or consistent speed. The loss of power created a hazardous situation in active traffic, as the vehicle could not safely maintain speed with surrounding vehicles. The vehicle was later inspected by an authorized dealership, which confirmed severe internal engine damage, including cylinder damage and engine misfire requiring major repair or replacement. No clear root cause has been provided. There were no prior warning signs or symptoms before the incident. WARNING SIGNS PRIOR TO FAILURE: NONE OBSERVED. The vehicle is available for inspection upon request. DEALER CONFIRMATION: YES. MANUFACTURER INSPECTION: UNKNOWN.

NHTSA ODI 11732364

Component: Engine/Powertrain/Electrical System Incident Description: I am reporting a recurring, life-threatening "Loss of Motive Power" (Dead Pedal) in a 2024 Hyundai Tucson (Alabama-built). On multiple occasions, the vehicle has failed to respond to throttle input during high-risk maneuvers, specifically while merging into 45+ MPH traffic. The vehicle "chugs" and stalls, refusing to exceed 15 MPH despite full accelerator depression. This defect leaves the vehicle and its occupants stranded and defenseless in the path of oncoming high-speed traffic. Technical Context: This vehicle is currently subject to NHTSA Recall 23V-526 (Hyundai Campaign 246) for electronic controller damage that can cause "CAN communication disruptions." I believe the "Dead Pedal" failure is a direct result of these communication disruptions between the engine and transmission control modules. Furthermore, Hyundai has issued TSB #24-AT-001H-1 for "Hesitation when accelerating," yet the authorized dealer (Ed Voyles Hyundai) has been unable to remedy the defect after 84 cumulative days out of service. Safety Risk: This is not a convenience issue; it is a critical safety failure. The unpredictable nature of the power loss makes it impossible to safely judge gaps in traffic. The vehicle effectively becomes a stationary object on active roadways without warning. Manufacturer Response: The manufacturer has been formally notified via certified legal counsel. Despite 79 consecutive days in the current repair attempt (since Jan 16, 2026), the manufacturer has failed to provide a fix or acknowledge the severity of the safety risk. An informal third-party evaluator attempted to dismiss the claim despite the vehicle's documented inability to maintain motive power. We are requesting that NHTSA investigate the adequacy of Recall 23V-526 and TSB #24-AT-001H-1, as these measures have failed to resolve this life-threatening "Dead Pedal" condition in my vehicle.

NHTSA ODI 11729169

I am submitting a vehicle safety complaint regarding my 2024 Hyundai Tucson Hybrid. The vehicle has a recurring engine warning issue (code P0471) that has not been resolved despite multiple repair attempts by an authorized Hyundai dealership. Additionally, there is a concerning discrepancy regarding vehicle usage while in dealership custody. My records indicate a substantial increase in mileage during service, which is not reflected in official service documentation. This raises concerns about vehicle handling and accountability. Hyundai has declined to escalate or properly address the issue and has advised that they will continue repair attempts without further resolution. Given the recurring nature of the issue and the lack of accountability, I am concerned about potential safety risks. I respectfully request that this matter be reviewed and recorded as part of any ongoing safety investigations.

NHTSA ODI 11726454

I am submitting this complaint regarding Hyundai Safety Recall #290 (NHTSA Recall No. 25V893) as it applies to my vehicle, VIN [XXX] . I received the official recall notice by mail on February 13, 2026. The recall identifies a defect involving the tow hitch wiring harness control module, which may allow water intrusion. According to the recall documentation, this defect can cause inoperative stop lamps and, in rare cases, an electrical short that could result in overheating or a vehicle fire. Since receiving the notice, I have contacted Hyundai Motor America corporate customer care three separate times seeking escalation and guidance on how to safely address this recall. During each call, Hyundai stated that no repair solution, parts availability, or timeline exists for remedying the defect. Despite the recall involving a documented fire risk and potential brake/stop lamp failure, Hyundai representatives advised me that I could continue driving the vehicle while waiting indefinitely for a remedy. No interim safety measures, inspections, alternative repairs, or mitigation steps were offered. I am concerned that Hyundai is failing to properly execute a federally mandated safety recall and is placing consumers in the position of operating vehicles with known, unresolved safety defects. Being advised to continue driving under these circumstances creates a risk to vehicle occupants and to other motorists. I am requesting that NHTSA review Hyundai’s handling of Recall #290, specifically regarding recall remedy delays, lack of escalation, and failure to mitigate an acknowledged safety risk, and take any enforcement or compliance action deemed appropriate. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11722026

On October 8, 2025, my car's tachometer started to dip and my car began to shake like it was going to stall as I approached a traffic light. The check engine light came on. I was close to my destination (about a 1/4 mile) so I drove to the parking lot and turned off the car. I started it again and the check engine light turned off and the car was running fine. On October 13, 2025, I took my car in for a routine oil change to a local repair shop and when they tried to reset the oil change reminder, the system would not work. Within a day, the entire computer system for the radio, warning systems, air conditioner/heat, etc, would not work. I took it to Burlington Hyundai on October 15, 2025 and they had to replace the CPU in the car. I got my car back on October 22, 2025. They said the check engine light did not come on again. It was covered under my warranty. I had my brakes replaced while they had the car out of convenience.

NHTSA ODI 11721380

On Saturday January 31, 2026, I was driving and the tachometer started to go low like the car was going to stall out and the car began to shake. Then the check engine light came on. I was afraid to drive it, so I parked it in a church parking lot and had it towed to Burlington Hyundai on Sunday February 1, 2026. On Monday February 2, 2026 Burlington Hyundai said there was a problem with the spark plugs and that was why the check engine light came on. They replaced the spark plugs and it was covered under warranty. I got my car back on Tuesday February 3, 2026.

NHTSA ODI 11721384

On Wednesday February 4, 2026 my car began to shake and shudder and almost stall out and the check engine light came on again. I had just gotten my car back from Burlington Hyundai the day before for the same problem. I drove it straight to the dealership for service. This time, they said it was a problem with the EGR system. They replaced some things and I got my car back on Friday February 13, 2026.

NHTSA ODI 11721387

My 2024 SEL hybrid has a very annoying acceleration delay after a full or partial stop. The delay has occurred many times. It is present no matter which mode the car is on. It is not a matter of slow acceleration, but a 1-2 second delay of anything happening after I press the pedal. this could be a safety issue when you're at a stop sign and you need to proceed and you can't go.

NHTSA ODI 11711658

The contact owned a 2024 Hyundai Tucson. The contact stated that his wife was reversing out of the work parking space, the brake pedal was depressed, and when the gear shift was shifted into drive(D), the vehicle then accelerated independently. The contact stated that the engine revved, hit a parked vehicle, bounced off that vehicle, and continued to accelerate independently, abruptly veered the steering wheel to the left to avoid hitting a tree. The contact's vehicle then hit a second parked vehicle, where it came to a stop. No warning lights were illuminated, and none of the warning alarms sounded. The driver’s and passenger’s side air bags did not deploy. A police report was not filed. There were no injuries sustained. The insurance company was notified and towed the vehicle to a collision center. The vehicle was not diagnosed. The manufacturer was not notified of the failure. The failure mileage was 17,000.

NHTSA ODI 11674098

The contact owns a 2024 Hyundai Tucson. The contact stated while driving approximately 60 MPH, the vehicle stalled. The contact stated that before the vehicle stalled, there were several unknown warning lights illuminated before the instrument cluster went black. The contact pulled over and shifted to park(P) and was able to restart the vehicle after several attempts. The contact stated that the failure had occurred intermittently and at various speeds. The vehicle also occurred while stopped at a traffic signal. The contact had taken the vehicle to a local dealer who was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 18,000.

NHTSA ODI 11659075

Car shuts off without warning scare that be in an accident if the shuts off on the highway.

NHTSA ODI 11608973

the entire computer system shorted out throughout the entire car. It did not let me select above all of what it affected. The entire car malfunction due to the dealer not doing predelivery inspection. They have the vehicle and have not given me a written explanation or reports as to what happened to cause this. This vehicle was defective and dangerous and should not have been sold.

NHTSA ODI 11545661