2024 KIA CARNIVAL Engine Problems

Out of nowhere, we started our vehicle that was no more than a year old, and all of the emergency alert indicators on the dash came on. All of the warning lights in the dash. The power steering went out and would go from very stiff to very loose. the car would shutter and then drive normal for a few min and then slow way down without warning. Again, all dash warning lights and alarms would go off. This first appeared on [XXX], we took to the Kia service on Nov. 17, 2025, and it was been in the shop with no repair since that day and todays date is Jan, 12, 2026. As of today they still do not know what is wrong with the vehicle and have no end in sight. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am submitting this complaint regarding my Kia Carnival. The vehicle has a recurring and dangerous problem where the engine suddenly jumps and, if I continue pressing the gas, it shuts off while driving. This has happened multiple times, including in the middle of the highway, creating a serious safety risk for myself, my passengers, and other drivers. I have taken the vehicle to a Kia dealership on multiple occasions, but they have not been able to identify or repair the issue. I also contacted Kia corporate, obtained a case number, and was told someone would follow up with me. Unfortunately, no one has ever called me back. This is an ongoing and unresolved defect that puts my family and the public in danger. I request that the NHTSA investigate this matter to determine if this is part of a larger safety defect in Kia Carnival vehicles. INFORMATION REDACTED PURSUANT...

Vehicle vents gasoline fumes into the passenger cabin causing drowsiness, headaches, and impaired cognitive function as well as exposure to a carcinogen. Vehicle has significantly high levels of CO2 inside the cabin at all times (2000-4000ppm) as well as TVOC and HCHO being higher than OSHA allows. Engine temperature gauge does not function properly and sliding doors have closed on myself and my children leaving bruises. If car were to be in an accident it would likely explode. Critical levels of CO2 have caused me to fall asleep while driving on several occasions including on the highway. I have brought car to Kia dealership in Tucson, AZ on 4 occasions, is currently back again for gas smell and high levels of CO2, with no resolution. Dealer manager and service team did confirm gas fumes in cabin and are currently using my CO2 monitor to test for CO2 levels. Vehicle component...

The contact owns a 2024 Kia Carnival. The contact stated that while driving at various speeds, the vehicle failed to properly accelerate while depressing the accelerator pedal. The vehicle was shuddering and vibrating while attempting to accelerate with the check engine warning light illuminated. The vehicle was towed to the dealer on several occasions, but the cause of the failure was not determined. The manufacturer was notified of the failure. The failure mileage was 3,500.