2020 KIA OPTIMA Fuelpropulsion System Problems

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...

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...

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...

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.

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.

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…

Fuel line had a quick detachment have to be replaced