2025 Kia Carnival Powertrain & Transmission Problems

The vehicle (2025 Kia Carnival Hybrid) has suffered from a systemic parasitic 12V battery drain since the first month of ownership. The first occurrence was July 20, 2025, requiring a jump-start from Kia Roadside Assistance. On 02/26/2026, the vehicle was presented at Moritz Kia Alliance for the same issue. The dealer diagnosed the 12V battery as defective (Code R04) and replaced it under warranty. However, the defect persisted. On 03/10/2026, only 12 days later, the vehicle suffered another total electrical failure. I had to utilize Kia Roadside Assistance for a jump-start and drive the vehicle directly to the dealer without turning the engine off to ensure it could be serviced. This marked the second official repair attempt for this recurring defect. The vehicle has remained in dealer possession since March 10 (21 consecutive days). On March 11, only one day after drop-off, the Service Director threatened that the vehicle would be "impounded" after 60 days, despite the vehicle being the subject of an active Texas DMV Lemon Law Case (#26-0012638.CAF). On March 26, a critical safety failure occurred: during a start-up attempt, the Integrated Power Brake (IPB) system malfunctioned, causing the brake pedal to pulsate and physically "kick back" with significant force against my foot. I have serious concerns that this braking failure could occur while in motion, posing an unreasonable risk of high-speed collision, serious injury, or death. No root-cause diagnosis has been made. Furthermore, the main fuse box cover was left off during service, exposing critical electrical components. The vehicle is available for inspection.

Vehicle Malfunction Report What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle's transmission and/or gear shifter system has failed to function as intended. When the gear shifter is set to "Reverse," the transmission has repeatedly shifted into "Drive" or "Neutral" instead. Concurrently, the vehicle's electronic backup camera system and audible sensor beep activate, indicating that the vehicle believes it is in reverse. The van is available for inspection upon request. How was your safety or the safety of others put at risk? My safety and the safety of others were put at risk on multiple occasions due to the vehicle shifting into the wrong gear. This has caused the van to unexpectedly lurch forward when I intended to back up. I have nearly collided with other parked vehicles and my garage door between 10 to 20 times. Has the problem been reproduced or confirmed by a dealer or independent service center? The problem has not yet been reproduced or confirmed by a dealer or service center, but it has occurred on numerous occasions and is a confirmed issue by the driver. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? To date, the vehicle and its components have not been inspected by the manufacturer, police, or insurance representatives. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps or messages displayed prior to the problem occurring. The primary symptoms of the malfunction are the vehicle shifting into "Drive" or "Neutral" instead of "Reverse," while the backup camera and an audible beep are active. These symptoms began almost immediately after the vehicle was purchased.

While I was driving on a highway, my vehicles "check engine" and "batter" lights were illuminated and a warning came across the car screen that said something along the lines of "Battery Management System Failure" and then "Powertrain failure". The car was not able to accelerate by pressing the gas pedal, and the heating/cooling features within the car stopped working. I quickly changed lanes to get to the far left shoulder of the highway, putting other cars at risk of my car that was slowing down to 50mph as I was getting over. When I would press on the gas pedal, nothing would happen. The car did remain on. When the dealership received the car the next morning they conducted what they referred to as a recall, but KIA refers to it as a "Service Action" - SA617 MCU DTC Logic Improvement. This requires a simply software update, which the dealership conducted, and the car was then working just fine, with no issues that I had indicated above. The dealership was Greenway KIA of Rivergate, 1526 Gallatin Rd North, Madison, TN 37115. The warning lights in the car illuminated about 5 seconds before the car was no longer able to accelerate due to the powertrain failure. In talking about the problem with a KIA representative, it was communicated that KIA has looked into this and it didn't pose any serious problems, so they left it as a "Service Action" item, not a recall.

The car doesn't start after overnight, or after a period of no usage for a certain time. Push button doesn't start the engine, it takes 25-30 attempts to get it started. It keeps happening almost every day.

I'm getting an alert in the car app that says low battery and will not perform any lock/unlock/start, etc features. It says the battery level is under 40%.