Which parts fail
Components named in complaints (fuel pump, injectors, fuel tank, hybrid and EV propulsion).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2012 Kia Optima owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2012 Kia Optima. The contact stated while driving at various speeds, the vehicle went into LIMP Mode and failed to exceed 61 MPH. The RPM failed to exceed 2,000 RPM. Additionally, the contact stated that the vehicle failed to exceed 45 MPH while driving uphill, and the vehicle failed to exceed 55 MPH while driving downhill. The contact scanned the vehicle with a vehicle scanner and retrieved codes indicating an oil control valve failure. The contact replaced the oil control valve; however, the failure recurred. The vehicle was taken to the dealer where the fuel rail system, the fuel tube clamps, and the bolts were replaced under NHTSA Campaign Number: 18V907000 (Fuel System, Gasoline, Engine); however, the failure persisted. The vehicle was taken back to the dealer several times. …
The contact owns a 2012 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power and stalled. The contact stated that she was able to restart the vehicle and proceeded to her destination. The vehicle was taken to the dealer. The vehicle was diagnosed, and the contact was informed that there was contamination in the fuel system. The contact was informed that the fuel system needed to be replaced. The vehicle was not repaired. The contact stated that the fuel system had been replaced less than three years ago. The manufacturer was not made aware of the failure. The failure mileage was approximately 74,000.
The contact owns a 2012 Kia Optima. The contact stated while driving at approximately 55 MPH, the vehicle hesitated. The vehicle lost motive power and was slow to accelerate. The check engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed that the high-pressure fuel pump was failing. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The contact stated that the failure was related to NHTSA Campaign Number: 18V907000 (Fuel System, Gasoline, Engine). The approximate failure mileage was 88,800.
The contact owns a 2012 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power. There was no warning light illuminated. The vehicle was towed to the dealer, where it was diagnosed and determined that the fuel pump module had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 162,000.
Car simply started for me after work this past Thursday @4 pm I dove down the street and for about 5 mins and had to turn around due to me leaving something at work. When I arrived back at work I parked and cut my car off as I normally do and when I returned to start it back up it never did. I have previously been having to add 5 quarts of oil frequently at least once or twice a month for the past 7 months since last year. Was told my car had an oil consumption problem by a previous mechanical shop last year. Noticed that these cars have recalls on them and that my car and year do fit the requirements. I do owned my car with the Title in hand. It's NOT a salvaged title. I have a service appointment on the 24th of June next Tuesday at Kia of Gastonia located in Gastonia, NC. I have to get my car towed to this establishment on Monday or the morning of my appointment. …
I was driving home at night around 8pm. I was merging into the slow lane and my car completely lost power. A semi truck was right behind me. Luckily I was able to get over to the emergency lane safely. My car had no acceleration at all or any control of the steering. Prior to this incident there was no problem or warnings of any lights on dash or car having problems. It's a daily driver for me to work. It's never gave me any problems prior to this. I've had the routine maintenance done on along with the recommended mileage maintenance done. It's been over a month now and my car still won't start I haven't had time to get it towed to a dealer ship or repair shop because I work 17 hour days. Everything I've researched about my make and model is starting to indicate that the engine seized up. I really hope that's now the case because my car will be paid off in 3months. …
Car was involved in the class action suite for the motor replacement and had the motor replaced at 156,763 miles on the car. Since the replacement the high pressure fuel pump has had to be replaced twice and is not needing replacement again with only 218,000 miles (62000 miles since replacement). There where no previous issues with the HPFP before motor replacement and KIA will not do anything about the HPFP continuous failure. This appears to be a very common issue with the KIA products and yet no recall has been issued. This is ultimately a safety issue as the vehicle can cut off while in motion causing a risk for collision but has not been addressed by anyone other than a Repair bulleting put out by KIA in 2013 to all their dealerships for this issue so KIA is aware of the issues with the failures. …
Engine replaced under the recall campaign after failure and have had issues since with the car wanting to start. Turns over several times before finally getting it to start. Fuel pump and fuel line replaced out of pocket as well as a sensor out of pocket and still having the same issues intermittently then today while driving approximately 35 to 40 MPH the car just shuts off in the middle of the highway in morning traffic and almost caused an accident, without warning. Still took several times to crank before car finally restarted and made it maybe 4 miles before shutting off again while driving without warning and then smelled as if something was burning. Car has had scheduled maintenance as advised by KIA for warranty on motor but if something is not done about all of these same complaints then someone is going to get killed. Very unsafe!
.I recently have actually found out about the recall concerning my engine. Manufacture SC148. NHTSA recall 17V224m I called a dealership. When I asked them about the recalls this one was not mentioned. I wanted to ensure I was reading that properly. Can you explain what that means as far as the engine
My vehicle has been smelling like fuel inside of the vehicle and cannot take it to a kia dealership due to them being backed up. There are no visible leaks inside or outside of the vehicle but it is unsafe to inhale fuel and every time i fill it up, the smell gets stronger.
Fuel System complaints in other Optima years
Frequently asked questions
How common are fuel system problems on the 2012 Kia Optima?
NHTSA has 54 complaints about the fuel & propulsion system of the 2012 Kia Optima, 6% of the model year's 920 complaints. The component named most often is delivery › fuel pump (1 mentions).
Is there a recall for 2012 Kia Optima fuel system problems?
No. NHTSA lists no fuel & propulsion system recall for the 2012 Kia Optima, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2012 Kia Optima fuel system problems start?
Half of the complaints with a recorded mileage happened before about 80,000 miles, and 10% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 5 fires and 0 injuries to fuel & propulsion system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.