NHTSA owner reports · September 18, 2026 snapshot.
Fuel/propulsion System complaints
11 reportsClear category filterMileage unknown · Aug 27, 2026
Electrical SystemEngineFuel/propulsion System
I own a 2020 Kia Optima and have been experiencing multiple ongoing problems with the vehicle. The vehicle is leaking and/or losing engine oil at an excessive rate. I have had to add oil multiple times within a short period of time because the oil level continues to drop. I am concerned that the continued loss of oil could resul…
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I own a 2020 Kia Optima and have been experiencing multiple ongoing problems with the vehicle. The vehicle is leaking and/or losing engine oil at an excessive rate. I have had to add oil multiple times within a short period of time because the oil level continues to drop. I am concerned that the continued loss of oil could result in engine damage or engine failure while the vehicle is being driven. I am also experiencing an electrical problem with the vehicle. The air conditioning and heating system will not turn on or operate properly. I was informed that the problem is related to the vehicle's electrical system/wiring. These problems have continued and require repeated attention. I am concerned about the safety and reliability of the vehicle, particularly the continued oil loss and the electrical malfunction. I am reporting these issues so they can be documented and investigated to determine whether other 2020 Kia Optima owners are experiencing similar problems.
NHTSA ODI #11760053
Mileage unknown · Aug 7, 2026
EngineFuel/propulsion System
Fuel Leak: I can smell heavy gas fumes inside the vehicle cabin. Fire Hazard: The vehicle is unsafe to drive due to an imminent risk of a fuel fire. Corporate Refusal: Kia Corporate refused to generate a case number and my local dealership refused to service the vehicle leaving a dangerous safety defect unrepaired on public roa…
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Fuel Leak: I can smell heavy gas fumes inside the vehicle cabin. Fire Hazard: The vehicle is unsafe to drive due to an imminent risk of a fuel fire. Corporate Refusal: Kia Corporate refused to generate a case number and my local dealership refused to service the vehicle leaving a dangerous safety defect unrepaired on public roads. Mechanical Symptoms: The car is experiencing slow cranking, engine sputtering, and multiple dashboard warning lights.
NHTSA ODI #11755485
Mileage unknown · May 27, 2026
EngineFuel/propulsion SystemVehicle Speed Control
I was driving on the freeway and my check engine light started to flicker and I felt my car shake and going to limp mode. I made an appointment with the Kia dealership and they told me the engine is failing. They submitted a request for a Goodwill case to Kia corporation and it was denied since there’s no open recalls and is not…
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I was driving on the freeway and my check engine light started to flicker and I felt my car shake and going to limp mode. I made an appointment with the Kia dealership and they told me the engine is failing. They submitted a request for a Goodwill case to Kia corporation and it was denied since there’s no open recalls and is not covered by the extended warranty. the dealership recommended me to take my car and keep driving it even though it’s unsafe the vehicle will not go above 50 mph and it starts to shake when driving I have tried to call Kia corporate and explain this situation but they have yet to follow up with me in my case
NHTSA ODI #11740375
Mileage unknown · Apr 22, 2026
EngineFuel/propulsion System
My vehicle burns oil too quickly. I schedule my regular oil change based on the feedback from the auto repair shop. During my last oil change he said I practically had no oil left, but it has been less than 5,000 miles since my previous oil change. The tech informed me he's seen this happen a lot within Kia's including the optim…
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My vehicle burns oil too quickly. I schedule my regular oil change based on the feedback from the auto repair shop. During my last oil change he said I practically had no oil left, but it has been less than 5,000 miles since my previous oil change. The tech informed me he's seen this happen a lot within Kia's including the optima that I currently drive. Fast forward a few months i noticed my oil light illuminate for a moment and immediately turn off. I still want to get it checked out just in case so i brought it back to the same shop. They informed me my oil was very low even though, but I still have another 1,500 miles before my next due oil change. He looked around and confirmed there were no leaks or damage that would affect the consumption rate. He highly recommended me look to see if there were any recalls on my specific model of vehicle that would warrant both an explanation and reason for replacement. In the meantime he topped off my oil and i was all good to go.
NHTSA ODI #11733038
Mileage unknown · Jan 5, 2026
Air BagsFuel/propulsion SystemPower Train
I purchased in July 2020, from sept 2020 I've had it at the dealership with shuddering, stalling and loss of acceleration. I originally thought fuel pump or transmission but kia said no. then in 2022 I received a letter from kia corporate stating low pressure fuel pump failure. so i called the dealership and told them the letter…
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I purchased in July 2020, from sept 2020 I've had it at the dealership with shuddering, stalling and loss of acceleration. I originally thought fuel pump or transmission but kia said no. then in 2022 I received a letter from kia corporate stating low pressure fuel pump failure. so i called the dealership and told them the letter states everything I had been in to see them about numerous times. made an appointment they said they found an error but had no fix. I complained heavily due to the fact I sat there for 4 hours, and they knew they had no fix as of yet. It was too dangerous like this. so the Manager said he'd just replace it with a whole new fuel pump but it could also fail. I sent the car in for 4 days just to find out they did not replace it. they only changed the fuel filter. stating kia wont let them put in a new pump due to their system not showing any other issue. The problem persisted and multiple visits to kia to no avail. Then on top of that my air bag light came on Jan 4, 2024. They said it was my responsibility it's not covered 1138.67 it would cost me. Then in Feb kia corporate sent me a letter about airbags. I did not go back because the light eventually went off by itself without a fix, then April 17, 2024 the original problem got even worse, shuddering, lack of acceleration , stalling feeling. Dec. 10, 2025 back to Kia. they have a code for dual clutch and flywheel so they ordered it & had my car for 19 days. I called numerous times to see about progress. I was told they are trying to chase down a code with a tech line. 7 days after that I picked it up & they said they did not change out any parts because there was no code. They only did a cap discharge. I have my car back now after 19 days & it's still not fixed. I called Jan5, 2026 and they said if kia is to fix it they need a code to be present or it'll cost me several thousand, even if its a known issue. so far it's been in the shop 9 times and 24 days total.
NHTSA ODI #11708981
Mileage unknown · Aug 15, 2025
Fuel/propulsion System
I own a 2020 Kia Optima. My vehicle has experienced repeated low-pressure fuel pump failures, causing hard starting, loss of power, and stalling risk. These issues first appeared in July 2023 and have recurred despite multiple repairs. The dealership has replaced the upper portion of the fuel pump three times (July 10, 2023; Ma…
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I own a 2020 Kia Optima. My vehicle has experienced repeated low-pressure fuel pump failures, causing hard starting, loss of power, and stalling risk. These issues first appeared in July 2023 and have recurred despite multiple repairs. The dealership has replaced the upper portion of the fuel pump three times (July 10, 2023; March 1, 2025; June 9, 2025) for the same issue, but the problem persists. Most recently, in August 2025, the vehicle again exhibited difficulty starting and loss of power. Diagnostic code P123300 was found, indicating the pump is not generating enough pressure. The dealership confirmed the entire fuel pump assembly needs replacement. This is a serious safety concern because the vehicle has gone into limp mode three times while driving — twice previously on the freeway, and again on [XXX]. On that date, I experienced sudden loss of power while driving, but I had a scheduled oil change on July 29, 2025 so I waited until then to bring the car in. At that visit, the dealership claimed the problem was only an old code P0456 and that my car needed a software update. However, the very next day, my vehicle went into limp mode yet again, creating another hazardous driving situation. My check engine light has repeatedly illuminated, and each failure matches the conditions described in Kia’s extended warranty program (WTY028) for low-pressure fuel pump failures on my model year. The warranty extension letter (WTY028) for my vehicle states that “repairs related to low-pressure fuel pump failure” are covered for 15 years/150,000 miles. It does not state that only the upper portion of the pump is covered. However, my dealership (Sands Kia Surprise) insists that Kia will only cover the upper portion, even though my issue requires replacement of the entire fuel pump assembly to correct the failure. This repeated failure creates a dangerous driving condition and appears to be part of a larger defect affecting this model’s fuel delivery system. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION
NHTSA ODI #11681001
Mileage unknown · Mar 11, 2025
EngineFuel/propulsion SystemPower Train
I am filing this complaint due to severe and ongoing safety defects in my 2020 Kia Optima EX, which has repeatedly stalled while driving, creating a life-threatening road hazard. Since September 2024, my vehicle has suffered from major failures, including a complete transmission replacement, multiple high-pressure fuel pump rep…
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I am filing this complaint due to severe and ongoing safety defects in my 2020 Kia Optima EX, which has repeatedly stalled while driving, creating a life-threatening road hazard. Since September 2024, my vehicle has suffered from major failures, including a complete transmission replacement, multiple high-pressure fuel pump replacements, multiple oil flushes due to fuel contamination, and all fuel injectors replaced. Despite all of these “repairs” performed by a Kia-authorized dealership, the check engine light continues to return, and the vehicle still stalls unexpectedly, making it dangerous to drive. On March 10, 2025, after Kia claimed to have tested the vehicle for 200 miles, I picked up the car from the dealership, only for it to stall and trigger the check engine light within hours before I even reached my destination. This vehicle has been returned to me multiple times in an unsafe condition. Additionally, an independent mechanic discovered an engine oil leak and a torn axle that Kia’s dealership never disclosed. This raises major concerns about their lack of proper inspection and repair procedures. This is a serious safety issue that Kia refuses to take accountability for. I request an immediate investigation into this matter before this defect leads to an accident.
NHTSA ODI #11647773
Mileage unknown · Jun 9, 2024
Fuel/propulsion System
I was stopped at a red light and the car stayed on but just stopped working. I had to wait for it to reset itself, or at least that was what it felt like it was doing. I got the oil changed in it the next day and about three weeks later the low oil light has come back on.
NHTSA ODI #11593335
Mileage unknown · Jun 21, 2023
EngineFuel/propulsion SystemUnknown Or Other
Dealers claim pistons are bad and engine is stalking eating through 2 quart every thousand miles or less. Properly maintained and everything not sure why the pistons would be bad already, also replaced a pcv sensor to fix problem but did not change anything.
NHTSA ODI #11528214
Mileage unknown · Nov 29, 2022
EngineFuel/propulsion System
Vehicle was tampered before purchasing, transmission mounts broken, evap hose gas tank and engine.. car was claimed as a lemon vehicle, dealership sold me a vehicle that’s unsafe to operate. Dealership refuses to fix…
NHTSA ODI #11495396
NHTSA investigations
1DP22003 · Loss Of Motive Power
Opened Sep 12, 2022 · Closed Dec 12, 2023
Status: closed (inferred from source dates) · Engine
The National Highway Traffic Safety Administration (NHTSA) received a letter dated July 13, 2022, petitioning the Agency to initiate a safety defect investigation into loss of motive power allegations attributed to oil drain pan assembly failures on certain Hyundai Motor America, Inc. and Kia America, Inc. vehicles spanning Model Years (MY) 2005-2021. The Petitioners cited examples of complaints indicating that the subject vehicles were experiencing rapid loss of engine oil due to oil drain plug back outs, resulting in loss of motive power and/or catastrophic engine damage. Additional complaints were provided which alleged that the oil drain pans lack sufficient structural integrity and are susceptible to cracking. The petition itself can be reviewed at NHTSA.gov under ODI number 11481745. On September 12, 2022, the Office of Defects Investigation (ODI) opened Defect Petition (DP22-003) to evaluate the Petitioners’ request. The Petitioners have provided additional complaints within four supplemental letters dated January 31, 2023, March 21, 2023, May 23, 2023, and August 4, 2023. ODI’s evaluation included the review and analysis of the complaints and supporting information submitted by the Petitioners, as well as additional complaints submitted directly to NHTSA which referenced either the oil drain plug or a crack in the oil pan. After reviewing the available data, ODI has not identified evidence that would support opening a defect investigation into the oil drain pan assemblies of the subject vehicles. Based on a review of the available information, a loss of motive power resulting from an oil drain plug back out has not occurred between the initial sale of a vehicle and the completion of its first oil change. If during an oil change service, a technician fails to remove the existing drain plug gasket before installing a new gasket, it is likely that a proper seal between the drain plug and the oil pan will not be made. An improper seal between the drain plug and oil pan could lead to the backing out on the drain plug, resulting in the sudden loss of oil while driving. Additionally, the provided examples of oil pan cracks were localized to the immediate vicinity of the oil drain plug and/or appeared to be the result of direct-contact with a tool during servicing. There is no information to support that a vehicle-based defect exists relating to the oil pan assembly, and instead the documented incidents are related to the failure to follow the proper maintenance procedures during oil change service. In October 2023, Hyundai published a Technical Service Bulletin (TSB) that provided detailed instructions for oil change service on its gasoline powered vehicles, specifically highlighting the need to remove and replace the existing drain plug gasket prior to reinstalling the drain plug. After a thorough review of the material submitted by the petitioner, the information already in NHTSA's possession, and the potential risks to motor vehicle safety implicated by the petitioners' allegations, NHTSA does not believe that a formal investigation is warranted. Therefore, the petition is denied. A Federal Register Notice (FRN) further detailing NHTSA’s reasons for denial of the petition will be published. The reference numbers for the complaints to NHTSA cited by the petitioner can be found in the petition submission documents in the public file for DP22-003. To review those complaints and the additional complaints ODI added to its evaluation which are cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.