2025 Kia Carnival Hybrid: check engine light

Filed Oct 22, 2026 · Acceleration, Fuel system · TX

My 2025 Kia Carnival Hybrid was purchased new in January 2025. The problem began almost immediately, with the vehicle first presented to an authorized Kia dealer for this condition at only 810 miles. The vehicle repeatedly and unpredictably enters reduced-power or “limp mode,” causing a sudden loss of normal acceleration and limiting it to approximately 35 mph. This creates a serious safety risk on highways, while merging, crossing intersections, or whenever acceleration is needed to respond to traffic. Equally concerning, the vehicle does not consistently display a warning or retain a hard diagnostic error code when the loss of power occurs. Sometimes a check-engine light or “Check Hybrid System - Stop Safely” message appears, but at other times the vehicle enters limp mode with no warning. After turning the vehicle off and restarting it, normal operation may return and the error disappears, leaving the dealer unable to retrieve a stored code showing what occurred. The vehicle has been presented to an authorized Kia dealer for this recurring issue at least five times. In August 2026, it remained in limp mode and had to be towed to the dealer. We were initially told no error code had been found. Near the end of the service period, we were told a code had appeared indicating a faulty sensor, which was replaced, but the reduced-power problem later recurred. The vehicle’s automatically generated August performance report also indicated no vehicle issues despite the August incident. A Kia TechLine case was later opened, but the recurring problem was not identified or permanently corrected. The vehicle is available for inspection.

Filed Oct 14, 2026 · Acceleration, Electrical · NC

In May 2026, after driving through a heavy rainstorm on the highway, the car suddenly cut off cruise control and showed multiple warning lights (for most, if not all assistance systems) and an error message that was some version of "check hybrid system." When searching the code it seemed to be related to an electrical short in the hybrid system. I had no electric power to the engine, but the gas functionality still sort of worked, so I could drive, but there was a 2-3 second delay between pushing the gas pedal and getting any acceleration, and said acceleration was minimal. This occurred at 70+ mph on a busy highway, so the sudden lack of acceleration and control was alarming and put us and the cars around us at risk due to sudden speed change. When we pulled into a safe stop and turned the car off for a few minutes and then back on, the error messages were gone and hybrid system seemed functional again. The check engine light remained, but turned off after the next short trip. There had been no warnings, lights, or symptoms of any issues at any point prior to this occurring. The car was not seen at the time due to being on vacation and not near any Kia dealership. It is being seen in a few weeks, but as this was 5 months ago, I do not anticipate anything being found to explain the issue, particularly after reading other online reports of this issue. A similar issue happened recently (Oct 2026) with no rain present. I had just started driving, and got a warning about lane-keeping assist, but no others. I pulled over, couldn't find any other errors or details, and everything else seemed fine. I continued driving, and 1-2 minutes later, while trying to accelerate onto the highway, I suddenly had no acceleration power with the pedal touching the floor. I was again at risk of a high-speed accident if I had not been able to move the car toward the shoulder quickly. No error code appeared at the time of acceleration loss. Power returned after restarting the car.

Filed Sep 22, 2026 · Electrical, Engine · UT

On random occasions, car will display "check hybrid system" and go into limp mode (limiting speed significantly) check engine, oil, and battery lights also illuminate. Had car serviced twice by dealership who cannot replicate the error, nor can they find any engine codes stored. However, this incident keeps occurring. Planning on having the car serviced again and not picking it up until it's figured out, but also wanted to report this incidence as I have seen several posts with other people complaining of the same issue. Concern is for if this happens randomly at freeway speeds and becomes a serious road hazard.

Filed Jul 10, 2026 · Acceleration, Fuel system · ID

On five separate occasions, while turning onto a high-speed roadway and attempting to accelerate to the flow of traffic, the vehicle suddenly lost the ability to accelerate. Despite pressing the accelerator, the vehicle would not exceed approximately 35 mph and then began to decelerate. During both incidents, a "Check Hybrid System" warning appeared, and I was forced to quickly pull over to the side of the high-speed road. The vehicle would only return to normal operation after it was turned off and restarted. This loss of power while merging into traffic created an extremely dangerous situation. Having three young children in the vehicle made the experience especially frightening, and I no longer have confidence that the vehicle can be relied upon to operate safely. Because this defect affects the vehicle's ability to accelerate safely in traffic, I am deeply concerned that it could result in a serious collision if it happens again. I took it into the dealership and the service center experienced the same issue. They thought they had resolved the issue and that it was a "one off" occurrence but it happened to me again just 3 weeks after the attempted repair. This time the engine light came on after the "Check Hybrid System" warning light.

Filed Feb 24, 2025 · Transmission · TN

When driving the vehicle it would not accelerate beyond 31 mph. We were in traffic so not being able to drive the speed limit posed a risk of other vehicles hitting us. Also when merging into highway speed traffic this was very unsafe. No warning limits or check engine lights came on and the dealer can not replicate the issue nor can they tell us why this happened.