2026 Kia Carnival Hybrid problems

“While I was driving, the car's engine shut off, and I could no longer accelerate. The car went into neutral and the brakes felt harder to press; the steering wheel did, too. Luckily, it happened after I turned into a mall parking lot. Since the car came to a stop and I couldn't accelerate, I turned it off and back on. Then I parked the car and turned it off. After 30 mins I started the car again and drove back home. The instrument cluster showed all types of warnings and failures when the issue happened. Since I panicked when it happened, I did not think about taking photos. Tomorrow I plan on taking the car to the dealer. This is a new car, driven only around 3500 miles. I am afraid this will happen again, and in a worse situation, like on the freeway.”

“On XXX my nearly new 2026 Kia Carnival Hybrid SX Prestige, with approximately 5,650 miles on the odometer, caught fire while I was driving in [XXX]. The fire originated in the engine compartment, where components of the hybrid electrical system, including the Hybrid Power Control Unit (HPCU)/inverter assembly, were subsequently found severely damaged. The incident occurred unexpectedly during normal vehicle operation and created an extremely dangerous situation. A vehicle fire while driving presents a serious risk of injury or death to the driver, passengers, and other road users. Following the incident, I sought emergency medical attention due to smoke inhalation. I was evaluated at an emergency department, including blood testing for carbon monoxide exposure. The vehicle was subsequently transported to an authorized Kia dealership. Kia America was notified of the incident and subsequently offered to repurchase the vehicle under California’s Song-Beverly Consumer Warranty Act. However, the manufacturer has not provided me with a definitive technical explanation of what caused the fire. I am extremely concerned that this incident may involve a potentially…”

“I am writing to formally express my serious concern and disappointment regarding my Kia Carnival Hybrid. Shortly after purchasing the vehicle, with only approximately 6,000 miles on the odometer, the vehicle suddenly stopped operating while I was driving on the freeway. This created a dangerous situation for my family and other motorists. The vehicle had to be towed to an authorized Kia dealership for diagnosis and repair. No warning or message had appeared before the issue. The dealership retained the vehicle for approximately one week and informed us that a PCB (Printed Circuit Board) component had failed and needed to be replaced. After the repair was completed, we were assured that the issue had been resolved and that the vehicle was safe to drive. Unfortunately, after driving only about 50 additional miles, the exact same issue occurred again. The vehicle once again became inoperable, leaving us stranded and raising significant concerns about the reliability, safety, and quality of this vehicle. We towed the vehicle on 6/22/26 and Kia dealership had it till today 8/7/26 and corporate keep saying they working on it but unresponsive.”

“While driving on an interstate during a heavy summer thunderstorm, the vehicle suddenly displayed a warning stating, "There may be a problem with the Battery Management System," along with a "Check Hybrid System" message. At the same time, the check engine light illuminated and the hybrid system stopped functioning without any prior warning. Approximately 10–15 minutes before the incident, I had driven through approximately 4 inches of standing water on a surface street at a speed of about 25 mph. After entering the interstate and traveling at approximately 65 mph in heavy rain, the hybrid system suddenly disabled itself. Cruise control was not engaged at any point during the trip. Immediately after the warning appeared, the vehicle experienced a significant loss of power and entered what appeared to be a reduced-power (limp) mode. The gasoline engine continued to run, but acceleration was severely limited, making it difficult to maintain speed or accelerate with surrounding highway traffic. This occurred at night, during heavy rain, on a busy interstate.The unexpected reduction in power created a hazardous situation and increased the risk of being struck by…”

“I own a 2026 Carnival Prestige SX Hybrid and having loss of propulsion problems. After much research, and absolutely no help from KIA, I now think my problem is my foot, size 15, is too large to safely drive this vehicle. My shoe intermittently depresses the brake ever so slightly while I accelerate from a stop. This triggers the Brake-Throttle Override which temporarily cuts propulsion power. The BTO is in all US cars but of the five vehicles (2025-26, different manufacturers) I have driven this past six months, this is the only one that has given me concern for my safety! KIA claims the vehicle is operating as expected! I claim that they have engineered the brake and acceleration pedals too close to each other creating a serious safety issue for those of us with larger foot sizes. The owners manual makes no mention of the BTO function nor how to restore propulsion once the BTO has been activated! While all US vehicles have the BTO function, they vary as to how the function performs. In KIA, once the BTO is triggered, all propulsion is suspended! The BTO was designed to prevent runaway acceleration. In this KIA, they have created a new safety problem because…”

“Detailed information is in the attached pdf file, but in a nutshell, Kia is covering a safety defect in their vehicles by claiming the process is “proprietary”. On several occasions we have lost propulsion, which means we had no control over our vehicle, and Kia’s explanation is simply, “the vehicle is performing as intended “! These incidents always happened at low speeds, just accelerating from a stop, but left us in a precarious situation as we were left in the middle of a busy intersection with no control over our vehicle! Propulsion would eventually return. After surviving several of these failures, I learned the proper thing was to let both pedals return to their idle position and then the vehicle would recover. This is a most difficult thing to accomplish when surrounded by angry drivers! The failures were identified by Google AI as a Brake Override System, also known as Brake Throttle Override. However, Kia already has a very functional Brake Over Accelerator process, so why would they have two similar functions? Kia knows the answer but is refusing to divulge any information regarding the intention or purpose of this mysterious process which makes our vehicle unsafe!”