2018 Kia Optima: hesitation when accelerating

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 Aug 18, 2025 · Engine · 10,000 miles · AL

The contact owns a 2018 Kia Optima. The contact stated that while driving at various speeds, the vehicle hesitated while depressing the accelerator pedal with the oil warning light flashing on the instrument panel. The contact's friend initially inspected the vehicle and discovered that the engine oil was empty. The vehicle was taken to a dealer where a diagnostic test was performed, and the mechanic discovered oil around the engine; however, the source of the leak was not discovered. The contact was informed that an engine valve was sealed and that the failure was repaired. Despite the repair, the failure persisted, and the oil light was frequently illuminated on the instrument panel. The engine oil level was checked and was extremely low. The dealer had not offered any additional assistance for the repair. The vehicle was not repaired. The contact made several attempts to reach the manufacturer but was unsuccessful. The failure mileage was approximately 10,000.

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 Jul 29, 2024 · Engine · 132,378 miles · VA

The contact owns a 2018 Kia Optima. The contact stated while driving 20 MPH, the vehicle hesitated upon depression of the accelerator pedal with the check engine warning light illuminated. The contact continued to drive the vehicle however, the vehicle failed to accelerate above 40 MPH and was shaking abnormally. The vehicle was not diagnosed or repaired. Neither the dealer nor the manufacturer was notified of the failure. The failure mileage was 132,378.

Filed Jul 12, 2023 · NC

When we drive the car it hesitates as if it’s going to cut off and it keep burning oil. We have to put in at least 2-3 quarts in per week.

Filed Apr 16, 2021 · Engine · 72,800 miles · TX

Tl* the contact owns a 2018 kia optima. The contact stated while driving 75 MPH, the vehicle abruptly stalled. The contact stated that there was no warning light illuminated. The contact coasted the vehicle unto the road shoulder and restarted the vehicle. The vehicle operated as intended. The contact stated that the vehicle was previously taken to ancira kia (6139 bandera road, san antonio, tx 78238, (210)684-4000) due to the hesitation and stalling. The dealer replaced the spark plugs and changed the oil however, the repair did not correct the failure. The vehicle was not repaired. The manufacturer stated that the VIN was not included in the federal safety agency campaign number: 17v224000 (engine and engine cooling). The failure mileage was 72,800.

Filed Oct 22, 2020 · Electrical · 19,200 miles · FL

2018 kia optima ex. Sometimes hesitates when trying to start, until today. All lights on dash lit up but no ignition. I tried several times, then steering and brake pedal locked up and I heard clicking noise. Had someone jump my battery and the car started up, but when I turned it off, it would not start again. Nothing was left on all night, car was locked and unlocked with handle. I am contacting the dealer this afternoon to see how they handle this.