2020 Kia Optima fuel system problems

Filed Oct 8, 2026 · Driver assistance, Engine · SC

At around 103K miles, I took to the dealership for a multipoint inspection for knocking when braking and my forward collision/lane assist systems going offline mid drive. I learn I have to replace my axle, despite replacing my axle in sept 2025. I return a week after due to the red oil light blinking on randomly, and when I checked the oil myself it was dry. The braking and assumed wiring issues remained. I find out that my oil is low despite an oil change July 16th 2026. It is October 8th 2026 as I type this. I am doing an engine flush in hopes to improve oil consumption, but i have since learned that my engine may fail from these other Kia stories. I have not stalled or had engine failure yet but now I am worried about having to sell my car to avoid having to keep replacing the same flawed parts over and over, or worse injuring myself while driving it. I was hoping to take a trip but now I have to rent a car and play another 1,600 dollars for the engine flush which I have no guarantee will actually work. I am disgusted, and there should be consequences for KIA (and many other companies) for taking advantage of their customers. I need a new car now!

Filed Sep 1, 2026 · Fuel system · 145,000 miles · MO

The contact owns a 2020 Kia Optima. The contact stated that while driving approximately 40 MPH, the vehicle intermittently stalled and lost automotive power, with an abnormal odor entering the cabin through the air vents. The vehicle was restarted and returned to normal operation; however, the failure reoccurred. The "Service In" message flashed on and off on the instrument panel. The vehicle was taken to a dealer where it was diagnosed and determined that the low-pressure fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 145,000.

Filed Aug 27, 2026 · Electrical, Engine · IL

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.

Filed Aug 7, 2026 · Engine, Fuel system · IL

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.

Filed May 27, 2026 · Acceleration, Engine · TX

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

Filed Apr 22, 2026 · Engine, Fuel system · IL

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.

Filed Jan 5, 2026 · Airbags, Fuel system · AZ

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.

Filed Aug 15, 2025 · Fuel system · AZ

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

Filed Mar 11, 2025 · Engine, Fuel system · CA

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.

Filed Jun 9, 2024 · Fuel system · GA

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.