2018 Kia Optima: jerking or lurching

Filed Sep 8, 2026 · Engine · 126,000 miles · FL

The contact owns a 2018 Kia Optima. The contact stated that upon starting the vehicle, the vehicle jerked abnormally. The failure persisted while driving, and the vehicle lost motive power. The contact was able to restart the vehicle; however, the failure persisted while driving. The vehicle was towed to a dealer to be repaired under an unknown recall for an engine software update and key fob replacement; however, the dealer failed to honor the recall repair and recommended purchasing a new vehicle. The manufacturer was contacted by phone, and a case was filed. The failure mileage was approximately 126,000. The VIN and License plate number were unavailable.

Filed May 6, 2026 · Engine, Locks · 121,000 miles · OK

The contact owns a 2018 Kia Optima. The contact stated that while attempting to accelerate from a standing start the vehicle had experience sever jerking and hesitation. Also, the vehicle has experience oil consumption problems and the contact constantly added engine oil. The cause of the failures were not determine. Also, the hood latch had malfunctioned and the hood could not opened to add oil to the engine. The cause of the failures were not determined. The local dealer and manufacturer were notified of the failures but no assistance was offered. The failure mileage was 121,000.

Filed Dec 10, 2025 · Engine · NM

While driving my 2018 Kia Optima S, the car suddenly jerked, lost power, and stalled in traffic. Multiple warning lights came on at the same time including the oil light, battery light, and check engine light. I had no acceleration and the brakes became very hard to press. The vehicle had to be towed for safety reasons. The Kia dealership inspected the vehicle and confirmed internal engine failure due to “cylinder failure” and stated the engine needs complete replacement. This failure occurred without any external leaks and without warning other than the sudden loss of power. The dealer stated the issue is not covered, even though it is clearly an internal engine malfunction. This is a major safety hazard because the stall happened while I was in active traffic. A sudden loss of power and braking ability puts me and others at risk of an accident. The problem has been confirmed by the Kia dealership through diagnostic testing. The vehicle is still available for inspection. Warning lamps appeared only at the moment of failure, giving no advance warning. This appears to be related to the ongoing engine defects in Kia vehicles involving oil starvation, loss of compression, cylinder scoring, and internal engine failure. Cylinder failure and sudden stalling should be investigated as part of the known safety-related engine defects affecting this model.

Filed Oct 1, 2024 · Engine, Transmission · 76,270 miles · FL

The contact owns a 2018 Kia Optima. The contact stated while driving approximately 40 MPH, the accelerator pedal was depressed; however, the vehicle failed to respond as needed. The contact stated that there was an abnormal growling sound coming from under the floorboard, and the engine was making an abnormal knocking sound. The contact stated that the RPM gauge was revving high while depressing the accelerator pedal; however, the vehicle failed to respond. The contact pulled over and turned off and restarted the vehicle; however, the vehicle was not running normally. The contact stated that the failure was a recurring failure. Additionally, the contact stated that vehicle was consuming approximately one quart of engine oil per week and the transmission was hesitating and was making the vehicle jerk while shifting gear. The contact had taken the vehicle to an independent dealer, but the vehicle was not diagnosed or repaired. The manufacturer was informed of the failure. The failure mileage was 76,270.

Filed Jun 28, 2024 · Engine · CA

Engine continuously stalls,while driving in both city and hight way. I have taken it in while under warranty and am told that's just how the car runs. Sudden jerks / seizure will happen while driving. since I haven't gotten the vehicle it happens at min 15mph or on the freeway at 65 mph. It is stalls at all mph .

Filed Apr 22, 2024 · Engine · TX

It started with the car using oil but the mechanic could not determine where the oil was going. It quickly lead to the Cadillac converter going out with a host of other things that cost me over $2900 to fix. Which only lasted a few weeks and the last incident occurred when I was on my way home and it would not pick up speed at all and would stall. The first time it happened I was on the free way and it lost speed almost causing a semi to run into the back of me. The second time I was at a red light and when I tried to accelerate in speed and it stalled and then began to jerk before it would pick up speed. Each time the occurrence happened it placed my life as well as my families life in danger as it was sudden with no engine light or any other lights coming on. The last time it happened it left me stranded with a child, over 2 hours from home and in the middle of the night on isolated highway. Every time I would call KIA they would give me the run around on the issue and say it was due to my negligence but I beg to differ as I feel as if it is an engine error on the manufacturing. Please help. Currently the car is sitting in my yard and I can not afford to keep paying for repairs due to a faulty engine that they refuse to fix.

Filed Dec 26, 2023 · Engine · 57,000 miles · TX

The contact owns a 2018 Kia Optima. The contact stated that while driving at an undisclosed speed, the low-pressure engine oil warning light illuminated, and the vehicle stalled. The contact stated that the vehicle jerked and almost lost motive power however, the contact depressed the accelerator pedal and continued driving. The contact stated that the failure had occurred on two occasions. The contact stated that the vehicle received an engine oil change; however, the failure reoccurred. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure. The failure mileage was approximately 57,000.

Filed Nov 7, 2023 · Engine · SC

The contact owns a 2018 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle stalled and jerked. The vehicle was towed to the dealer where it was purchased from. The contact was advised that the vehicle would be towed to a Kia dealer for service. The vehicle was towed to the Kia dealer and diagnosed with failed spark plugs. The contact was informed that the spark plugs needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was towed back to the Kia dealer and the contact was informed that the spark plugs were corroded due to oil consumption and the spark plugs needed to be replaced. The contact was also informed that the engine needed a combustion cleaning. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was unknown.

Filed Aug 8, 2023 · Engine, Fuel system · TX

I'm reporting these issue pertaining to the engine within the first 3 weeks AFTER the engine replacement recall was serviced and completed. The vehicle was exhibiting the same defects and major health and safety hazards as before the new engine. Intermittent engine failure, even worse, while i was trying entering the hwy at speeds of 45-50 miles it jerked very violently and loss total power while vehicles were behind me nearly rear ended. Prior to this I reached out multiple times to have it serviced at again. The original service department didn't respond, so I called other service departments and was told it needed to be serviced by the original dealership/service department that replaced the engine. I had the vehicle in normal working conditions a few days before it began exhibiting the same problems as before the engine replacement. It was in operable condition but still stalling and refusing to crank unless primed, until it ultimately just would not crank at all and is back in the same condition it was before the new engine but it is not locked up currently. The time frame and Milage between first experiencing the issues to now, March 2023-64745 Started shuddering, loss of power while driving, but would crank right back up without issues. Happened a few times, charged up battery thinking is was am electrical issue. April 2023 More frequently the issues occurred, still same severity levels. May 2023 Began happening every time at an idle, whether I was at a fast food in drive through placing an order, or to wash the car. Every time at an idle this would happen, and would take a few times of trying to start the vehicle and after about 5 seconds of cranking it would catch and work. I began placing the vehicle in neutral while at idle and it would assist In the stalling out sometimes. After a few days of this it refused to crank due to the engine locking up. Milage at this time was 68048. Aug 2023-New engine, drove about 2k miles-70207 current

Filed Jun 18, 2023 · Engine · IL

I purchased this vehicle used in April 2023 with 3,000 to go prior to another oil change. I returned home from a trip and the oil light would come on only while turning or braking. When checking the oil there was no oil in the motor. The reservoir was filled and two weeks in the engine is low on oil again. There are no leaks. The car jerks at lights as if it wants to stall out. I feel unsafe driving this car.

Filed Mar 3, 2023 · Transmission · 60,000 miles · NC

The contact owns a 2018 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle was jerking. The vehicle was taken to the dealer; however, no cause for the failure was found. The vehicle was then taken to Battleground Kia of Greensboro (2927 Battleground Ave, Greensboro, NC 27408) but no cause for the failure was found. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 60,000.

Filed Sep 2, 2022 · Fuel system, Lights · NC

Trying to cut off and jerks when stopping vehicle