While driving approximately 50mph in my sorrento the car hesitated and stalled when I pressed the gas to pass a car next to me. Ithe felt like a slip. I wasn't sure what to make of it, but over the next 4 days it started happening more frequently. I went to turn it on the 4th morning and a cloud of white smoke came out of my tailpipe. I decided it needed to go to Kia immediately. My sorrento is a 2015 with 27xxx miles on it. This is not what I expected from a new car. I brought it to Kia and was called 10 minutes after I received my courtesy ride back. I was told a diagnosis was sludge and they needed maintenence records. I brought my receipts (which I had to have my mechanic type back out as I hadn't saved any reciepts). When we brought those in I had a spare key to my car and noticed it was in the parking lot. I checked under the hood only to discover they hadn't even pulled the valve cover on the car (I know this because there was a dead wasp frozen to the top of the bolt you need to take off to remove the cover that was there when I brought it in). They informed me that they opened the cap and that's how they knew even though initially on the phone they said they pulled the valve cover. They took my service papers and called me the next day to say Kia won't cover it and rejected my records. My mechanic is a licensed mechanic. No reason given for the rejection. They say we will be responsible for engine replacement but still can't give us a diagnosis other than "sludge". so much for their "best warranty in the business".

- Cape Coral, FL, USA

The contact owns a 2015 Kia Sorento. While driving approximately 40 mph, the vehicle suddenly jerked and stalled. There were no warning indicators illuminated. The vehicle failed to restart and had to be towed to the nearest dealer. It was diagnosed that sludge was present in the oil reservoir, which caused the engine to shut down. The vehicle had to be towed back to the state of residence and the dealer diagnosed that improper oil changes were performed. The engine had to be replaced. The manufacturer was notified of the failure. The approximate failure mileage was 70,000.

- Powder Springs, GA, USA

The SUV has been having white smoke coming from tailpipe and the car has been pulling. It makes ugly noise when we try to accelerate on the freeway and pulls. The oil light isn't coming on to tell us when the oil is low even if it's not time for a pil change. We seem to notice that the car is burning oil more frequently than a normal vehicle. Also notice sludge when we check the oil even if we had just had a oil change it seems to come back. The dealer keeps telling me there is nothing wrong with it. They tell me they can't find anything wrong.

- Santa Ana, CA, USA

I was driving down the road with my 4 children in the car at 45 mph when all of a sudden my car completely lost power. Luckily I was able to coast to the side of the road. It was over a 100 degrees outside and my 4 kids under 6 had to sit and wait on a ride in the heat. The car has 40,000 miles on it and has had 7 oil changes, of which I have provided the receipts for. There is engine sludge despite the fact that the oil was changed more frequently than the manual suggested 7500 miles,

- Choctaw, OK, USA

How can NHTSA give a 5-star safety rating to a 2015 Kia sorrento based on a 2013 crash test done on this model vehicle when there is obvious a problem with this vehicle in the 2014/2015 Kia sorrento models. Since 2014, there has been at least 2 serious injuries and other complaints due to this defect and its non-deployent of airbags, etc. (please look at the photos, video & small overlay crash report at www.iihs.org/iihs/ratings/vehicle/V/Kia/Sorento-4-door-SUV/2015)..the manufactiurer was well aware of this since they redesigned the 2016 model. This defect should be made public for all vehicles affected with these issues which should repaired or recalled to avoid further risk of serious injuries and/or loss of life. It is completely wrongful, harmful and negligent of NHTSA to give an "5-star safety rating" on a later model vehicle based on an outdated test & without fully and appropriatel testing; rendering false misrepresentation to the vehicle shopper.....updated 06/21/17

- Freeport, TX, USA

Had oil light go on when I would take off from a stop but would turn off when I stop. I called the dealer and took it in and was told that the oil filter was put in wrong. The dealer put a new one on and did all the test to make sure it was working proper. Nine day later I had a oil leak and called the same dealer and was told to come back in. The service manager then told me the because someone else had done other oil changes on the car I would have to pay for any repairs if the other place would not. When I asked about the part being under warranty the service manager told me that this part was not under warranty. The service also told me that even if the dealer did the oil change after the first one that Kia would not warranty it. So now I will get a bill over 900 dollars and still not know if I have a engine that will work.

- Morris, IL, USA

I purchased a new 2015 Kia Sorento May 17, 2014. As I was driving down the road last night at approximately 45mph, suddenly the car jerked around, sounded like I downshifted (although it's an automatic) and I got the diagnostic message of the "engine control system- possible engine condition" it told me to take it to the dealership for service immediately. They said today that they had to order a new throttle body assembly and it was too dangerous for me to drive. Not sure if anyone else has had these problems yet but it shouldn't be happening in a brand new car!

- Iva, SC, USA