2025 KIA CARNIVAL Engine Problems

TL;DR : Vehicle engages limp home mode without any notification to the driver that it is in limp home mode and doesn’t generate any codes for technicians to identify why the vehicle went into limp home mode. During oil changes, a significant amount of residual oil remains in the engine. When the lube tech fills the oil using the recommended amount, engine is actually over full of oil as indicated on the dip stick. The vehile will start and run fine for a while. Later however, an oil pressure sensor will detect the over full status and put the car into limp home mode. No check engine light, no oil light, no indicator saying it’s in limp home mode, and when the service tech investigates, no code thrown for the issue. A manual checking of the dip stick will reveal the oil is over full. The fix is to drain...

I live in Alabama. Temperature here is 34 degrees so far in the morning. My check engine light is on. I have taken it in and had diagnostics and they can't find a code or code history. My heat and AC do not work properly if the ambient temperature on the cluster doesn't show up or is not correct. 72 degrees when it's not working right will run you out of the car it's so hot. The cluster currently says it's -15 degrees outside and has the snowflake beside it. I am scheduled bc they are booked out at the dealership to have diagnostics run on 11/14. I don't know if it is wiring, ambient temperature sensor, max air sensor, HVAC module (dealership had previously cleared water out of the module and then replaced the module, initially when they couldn't find the problem they disconnected the battery and reconnected to...

This is the second time, while I was driving that the car would not want to pick up speed and shuddered. The engine light came on again. And stayed on this time. I brought it back to the Kia dealer. They ran a diagnostic. They first wanted me to pay the cost. It is under the warranty. Now I am waiting for the parts and was told to not drive my car until it gets repaired. No loaner was offered. They said to drive it home and they will contact me.

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 was turning onto a main thoroughfare fare, and the van was slow to accelerate, Engine light briefly blinked, then went off, and then when I was on the interstate I had to pull over the van was running rough. Once I went back on the road, the steering wheel was shuddering and finally the engine smoothed out. This has happened more two other times to me.

On 6-9-25, for the second time in the 10 weeks that I have owned my new 2025 KIA Carnival it has failed to accelerate beyond 30 MPH after pulling away from a traffic light. The vehicle displayed a warning that The Speed Limit Was 30 MPH and would not accelerate beyond that speed. The speed limit was not 30 MPH. I was able to pull onto a side street and take a photo of the warning, I took the vehicle and the photo to Boniface-Hiers KIA on 6-10-25. The dealership was not able to determine the problem but thought it could have some connection with the cruise control system. Once again I was lucky not to be rear ended by the car behind me.

On April 22, 2025 my Kia Carnival Ex would not accelerate more than 30 mph after pulling away from a traffic light. A warning appeared on the dash display saying The Speed Limit Was 30 mph and the Kia Carnival would not go beyond 30 mph. The Speed limit was Not 30 mph. I took the vehicle to the Boniface-Hiers Kia dealership on April 24, 2025. They could not find a problem but did re-set the computer for the transmission. I was very fortunate not to have been rear ended by another vehicle.

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%.

Started about a couple weeks ago. Just bought my car and my battery drained 3 nights in a row. Had to jump start it Found out some fan run, when car is off, hours after it has been parked.

After a week of owning the car the battery died over night. Was jumped by roadside and died later that day and jumped again. After the 2nd jump, the AC and air bags didn’t work. Then the check engine light came on. Kia has had my brand new carnival since July 26 with no fix.