2026 Kia Carnival Hybrid Transmission and drivetrain Problems

“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. …”

“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. …”

“While driving a brand new Kia Carnival Hybrid (purchased yesterday), I experienced a severe, life-threatening powertrain acceleration lag from a rolling start. My children were in the car and this was very scary. When attempting to accelerate into oncoming traffic on a wet road surface, the vehicle completely hesitated and dropped power for approximately 1.5 to 2 seconds, leaving the vehicle stranded in the path of oncoming traffic. When the power finally engaged, it delivered a violent surge of torque that caused the front tires to break traction and squeal aggressively. …”

“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. …”

“Without presenting any errors, the vehicle appears to enter some sort of limp home mode which limits speed to 31mph until the vehicle is turned off and re-started. 31mph is well below the speed limit on most public roads and being limited to this speed with no ability to pull over to stop/start the car creates a significant safety hazard to the driver of the vehicle and other motorists.”