Hyundai Kona misfire problems

Filed Aug 27, 2026 · Engine, Transmission · MI

Leaking oil...burns exceptionally fast even with dealership services. Pistons not sealed, melts new spark plugs, misfire on cylinder 3

Filed Jul 21, 2026 · Acceleration, Engine · FL

I purchased a 2018 Hyundai Kona, and it has had one major issue after another. It burns an excessive amount of oil, the engine misfires, and now the turbocharger is failing. I’ve already spent approximately $2,300 repairing the air conditioner and engine, and I can’t afford thousands more in repairs.

Filed May 22, 2026 · Engine · 78,000 miles · TX

The contact owns a 2019 Hyundai Kona. The contact observed excessive oil consumption, which has progressively caused the vehicle to stall 2 to 3 times per week. While the engine can be restarted, it idles and runs roughly immediately afterward. Additionally, the contact noted a distinct smell of burning oil exiting from the exhaust system. The contact referenced the federal safety agency Campaign Number: 21V301000 (ENGINE) however, the VIN was not included in the recall repair. The vehicle was taken to a independent mechanic where it was diagnosed to have excessive oil consumption. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 78,000.

Filed Mar 23, 2026 · Engine · CA

Vehicle struggling to accelerate and rolling back when brake is not being used. It stays at a few miles per hour even with full pressure on the gas pedal. A mechanic reviewed and stated the problem was due to low compression in the engine, causing the pistons to misfire. This issue has happened a total of 5 times and has almost caused other vehicles to crash into me due to sudden loss of speed and not being able to accelerate fast enough to properly get to safety

Filed Feb 26, 2026 · Engine · GA

Was driving when the car seemed to lose power and would not accelerate and started shaking. Check engine light came on and got it read, the code indicated a misfire and other errors. There was no one local to fix it as we were out of town. So we replaced the plugs that were indicated and noticed how badly damaged they were. Vehicle started to drive better before stalling out again and replacing the rest of the plugs. Was able to get it home and seemed to be driving normally but then we noticed it has an oil leak now. We have to keep a religious check on the oil because of the amount leaking and the fact the car isn't giving us a low oil warning. We took it to the dealership and they said we needed a new engine and it was just outside the power train warranty. All of this occurred our 78,000-80,000 mile mark. The dealer would not even change the oil before of how bad the leak was. This car was for our teenage daughter and its not safe for anyone to drive. I believe the dealership knew this car had issues, we bought it pre-owned and have only had it 6 months.

Filed Feb 16, 2026 · Engine · IN

The car was burning through oil every 14 -21days. Car has been jerking and taking a while to accelerate. Went to machine to see what’s going he suggested I go to the dealership because there’s no leaks visible. But added more oil so I wouldn’t go without oil there was nothing available for me to come in right away and before my appointment my car started to speed up out of nowhere then completely slowed down then jerked until I could find a safe space to pull over. Check engine came on and the code was reading a misfire. Got a tune up still reading as a misfire now just stuck at the dealership playing guessing games with what’s wrong with the vehicle.

Filed Jan 22, 2026 · Engine · IL

I was traveling on the interstate when my car began to slow down and the RPMs kept going up. I pulled over on the side of the highway and turned the motor off. I waited 10 minutes and started the car again thinking it was just a misfire. The motor began making weird noises and shaking. My engine like came on the dashboard display reported major malfunction get help. I was told by my mechanic that I was lucky the car did not catch on fire. He determined that pistons 1 and 3 were misfiring. He said it was being flooded with fuel. I have complained about the excessive burning of oil and that there must be an issue. Several have been recalled but not specific car.

Filed Mar 10, 2025 · Engine, Transmission · CA

My vehicle has a very rough idle-vibrating at idle or stopped and not shifting properly-gear slipping. There is sluggish acceleration or jerking and the problem worsens while at a stop light/stop sign or at times when making a turn. The RPM goes between 200-300 when I accelerate to go from a stop and the car revs as it slowly hits 20 mph and then jerks into the 30-40mph on the streets. I took it to the dealer January 2025 where they could not duplicate the concern, and all they did was a TCM judder improvement update for the DCT. The problem was dismissed as being an issue associated with the DCT and was told that unless a warning light turned on or my car broke down on me, they couldn't do anything more. The service representative advised that if I am in stop and go traffic and the car starts vibrating or shaking, I should pull over the side and turn off the car for a few minutes before continuing on my way. It has been less than 2 months and I have to take it back to the dealer so they can run diagnostics on it again. Same issues, no warning lights on the dashboard indicating there is a problem, but I am not comfortable driving the car anymore.

Filed Dec 4, 2024 · Engine · 40,000 miles · NH

The contact owns a 2019 Hyundai Kona. The contact stated upon starting the vehicle, the vehicle made an abnormal sound. Additionally, the contact stated while driving at various speeds, the vehicle made an abnormal knocking and clicking sound. The contact stated that the vehicle had experienced engine hesitation intermittently, and the failure became permanent. The contact stated that the vehicle was experiencing excessive oil consumption. The contact had noticed that the oil level was significantly low, and the oil was significantly black at 500 miles after an oil change. The contact stated that on other occasions, the oil was significantly black while at the normal full. The contact stated that while his wife was driving 20 MPH uphill, the vehicle stalled and started rolling backwards. Several unknown warning lights were illuminated. The vehicle lost power steering and braking functionality, causing the driver to lose control of the vehicle. The vehicle then slowly rolled back off the road and struck a small tree. The contact did not sustain any injuries. The vehicle was restarted after an hour and half. The contact stated that the vehicle stalled while driving 10 MPH on another occasion and was able to restart after 15 minutes. The vehicle was taken to the dealer, where the fault codes were cleared; however, the failure persisted. The vehicle was taken to the dealer, where DTC: P0301 was retrieved. The dealer diagnosed that cylinder #1 had a misfire due to the valve cover gasket leaking oil into cylinder #1. The dealer determined that the valve cover gasket, the spark plugs, and the oil filter needed to be replaced. Additionally, the dealer recommended an engine restoration and fuel induction service. The vehicle was not repaired. The contact related the failure to the federal safety agency Campaign Number: 21V301000 (Engine); however, the VIN was not included. The manufacturer was notified of the failure and a case was opened. The failure mileage was approximately 40,000.

Filed Oct 22, 2024 · Engine · 104,745 miles · TX

The contact owns a 2018 Hyundai Kona. The contact stated while her daughter was driving at undisclosed speeds, the engine warning light illuminated. There was an abnormal knocking sound coming from the vehicle. The vehicle was taken to an independent mechanic, who determined there was knock in the cylinder. The vehicle was taken to the local dealer, where it was determined that the cam was overworked and both cams had overproduced. Additionally, there was a misfire in cylinders number 1, 2, and 4. There was a power imbalance test performed, which determined that cylinder #3 was the cause of the failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 104,745.