10.0

really awful
Crashes / Fires:
3 / 7
Injuries / Deaths:
3 / 0
Average Mileage:
47,355 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2015 Kia Optima fuel system problems

fuel system problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2015 Kia Optima:

Unsubscribe any time. We don't sell/share your email.

2015 Kia Optima Owner Comments (Page 1 of 2)

problem #36

Sep 152022

Optima

  • miles

A D V E R T I S E M E N T S

My car has been consuming lots of oil. I took it in for an oil change and while test driving two of the mechanics stated the oil light came on and it ran out of oil on the test drive. Instead of saying anything about a possible issue with the engine, they went ahead and put oil in it and sent me on my way. Since, my car is still consuming loads of oil. I've taken it into the dealership several times for the same issue and each time they told me they can't do anything about it until it runs out of oil. One person advised to not put oil in it. Now the engine light came on, so I took it in again and this time I was told the cylinders have gone bad and one person that worked there said to let it run out of oil, but you didn't hear that from me, and they will replace the engine for free. I said, so I'm supposed to let the car die while I'm driving it, what happens if the car quits running in the middle of a turn and I get hit, the guy looked at me and said nothing. In addition, he asked if I had an extended warranty as its covered under an extended warranty. I'm pretty sure I did buy one, but I couldn't remember, so I called up the dealership I purchased it from and they said they couldn't tell me either since, they don't keep any paperwork after 7 years, and its been 8 years.They also said it wouldn't matter as it wouldn't be covered because of mileage. I have been complaining about the oil way before my mileage was over and I'm pretty sure I read something about mileage ext on Kia for this same issue.The last time I drove it, I was sitting idle in my car and the oil light came on, so I called the dealership, they asked if it started back up and I wasn't sure, so I tried and it started back up and the oil light went back off again, so I didn't have it towed down there. Now my understanding there is a new recall on the car with the fuel and it could catch fire and was stated to park it, so its been sitting for three months with nothing fixed.The car needs a new engine.

- Harpster, OH, USA

problem #35

Oct 222023

Optima

  • miles
Engine failure & fuel leak. Also oil was burning extremely fast. I had taking it to the dealership while back ago for a recall and said it was fixed. Few months later gas started running out fast. A check light engine came on saying there was an evaporation leak. I did call the dealership to see what exactly they fixed, emailed them. They kept telling me they would call me back and never did. Wouldn-??t get any emails back. I took it upon headquarters to let them know about the oil burning fast and emailed. And called them. Apparently there was nothing they can do and told me I have to call the dealership. I took the car to my mechanic because I trust him more than the actual dealership at this point. And I brought up concerns about my safety being in that car. No one heard me out or seemed to care. And now forward months later after check light engines on and the pcv valve getting changed, purge valve. The light stopped coming on after changing the purge valve got change which linked to the code that showed up. I started seeing online that Kia optima-??s have so many engine problems, misfires etc. and now my Kia has an engine failure. I tried to contact Kia again by entering the info for a settlement and I was told there is nothing they can do about it. So now I-??m left with $5,500 to finish paying off my loan for the car and can-??t even drive the car anymore. I havnt felt safe In my car for months and no one would hear me out.

- San Gabriel , CA, USA

problem #34

Oct 272023

Optima

  • miles
Engine lost power and when restart was attempted, it could torn turn over. Tried restarting 3 times with no success. After this, smoke started coming from the hood. I opened the hood and noticed a small flame at the driver side bottom of the engine compartment. Flame intensified and grew and eventually I extinguished with a fire extinguisher. I had just replaced the starter that same week and replaced some wiring at a local car repair facility.

- Madison, AL, USA

problem #33

Sep 082023

Optima

  • miles

A D V E R T I S E M E N T S

1st problem happened when I was at a complete stop, at a traffic light, in rush hour traffic. All the sudden steam started coming out from underneath my hood. I instantly looked at my temperature gauge and it did not show anything however I knew something was wrong when the light turned green I immediately pulled over, out of the street as far as I can get without being hit by other cars. I put on my hazard lights. Pop the hood. I had a gallon jug in my trunk. And I walked to a store to fill it up with water. Came back, poured the entire gallon into the radiator. Waited for at least 30 minutes. Started the car and made it home. After that incident, the problems with this 2015 Kia Optima has snowballed. It just amazes me that it has started happening 2000 miles after my extended warranty expired. I had to purchase and replace spark plugs, the coil packs, two other sensor things, which I do have the receipts for and now the car reeks a gasoline and it automatically kicks into overdrive and I lose my reading on my tachometer, this puts it into a disabled mode, I'm on the freeway in Russia traffic, trying to pull over without getting into an accident. Do I believe this is a safety concern? You're damn right I do am I mad yes. I am taking my k i a into the dealership. After doing my research on this make and model, is the dealership doesn't honor what the claims department and the media response to this problem. Will then I will leave the car with Kia because I cannot afford a new engine. I will have to call to finance company and let them know that I voluntary I'm letting them come repo this car, good luck selling

- Corpus Christi Texas, TX, USA

problem #32

Sep 102023

Optima

  • miles
Excessive shaking of engine, stalled out while driving on highway, knocking in the engine.

- Chicago , IL, USA

Search CarComplaints.com for these popular complaint phrases...

problem #31

Dec 262021

Optima

  • 115,696 miles
I have 2015 Kia Optima grey or platinum graphite exterior color since Aug 2019 I had an tbone accident last Dec 26 2021 which iam not at fault for never received any type of comfort care claim it was during covid pandemic I was in the process of grieviance being hate left in despair also job loss with no income unstable living situation which I was living on my personal vehicle been going through financial hardship until present I havent been driven until I brought to Kia dealership Jan 1st of 2023 due to my personal injury and car accident it was left parked got towed with busted windows had my personal belongings being gone missing.... I have rough years... it was difficult for me to get back up in my feet my car has recalls arent being repaired fairly. This will be my first time to adhere my concerns I would like to get some assistance if possible...I thank you in advance

- San Diego, CA, USA

problem #30

Aug 052023

Optima

  • miles

A D V E R T I S E M E N T S

I was driving North on the 57 freeway and my car stop running and I pulled on the side of the freeway and my car catch on fire. Everything started in the engine. I called Kia and made a complaint and they told me it was not under warranty and they could not help me.

- Pomona, CA, USA

problem #29

May 202023

Optima

  • miles
I driving my vehicle is just started powering down and didn-??t want to turn on again. We jumped started it thinking it was the battery but it checked out fine. The vehicle doesn-??t want to start anymore and the mobile mechanic said the engine had ti be replaced since it was off the timing loop. No engine or vehicle lights were in and no prior issues were appearing.

- Lewisville , TX, USA

problem #28

Jan 022023

Optima

  • miles
My 2015 Kia is burning 1. a lot of oil and 2. The second is the car smells of gas scared it is one that will catch fire

- Mechanicsburg , OH, USA

problem #27

Mar 112022

Optima

  • miles
The fuel rail seals keep leaking and spraying fuel all over. Fuel rail needs replaced

- Mendon, MI, USA

problem #26

Feb 282021

Optima

  • miles

A D V E R T I S E M E N T S

I purchased a kia turbo optima from bob's lamphere's beaverton oregon kia dealership 9 days later I felt the acceleration awkwardly bi wanted to return it or exchange but was told no contract was only within 5 days. I took it to kia dealership for diagnostic 3 times I had it for 9 months the last 6 weeks was the 3rd time until Feb 28th It was totaled by a uninsured motorist memes william benton penny lll Or. Driver lic# 1289466 Of 1633 n.e. 76th portland oregon 97213 he was speeding illegally bypassing on a bridge into on coming traffic which was me he ending totally the back end of my kia. No air bags deployed I had no airbag warning light on I suffer injuries whiplash in my neck shoulder and back to this day Wild willy seemed to have injured his leg to the point of amputation... Portland police report# 21-54465 which is the report that wild willy gave a false identity. Later the officer text giving his real identity. To this day I haven't been compensated for bodily or auto damageby wild willy or Geico my insurance. And lost my kia in a junk yard with a remaining of a bill of 12,000 of 25,500.

- Portland, OR, USA

problem #25

Nov 302022

Optima

  • miles
I have my car only for a year and my map sensor has gone out but is not showing a indication or a light inside the vehicle until the vehicle cut off as I-€™m driving

- Jacksonville , FL, USA

problem #24

Jul 312022

Optima

  • miles
Recently has a new engine installed at pitre Kia, due to a recall malfunction, they installed a new engine but didn-€™t fix the recall problem, now that I have my car back. My engine moves when I hit the brakes, my brakes go all the way down sometimes, doesn-€™t stop the car at all, I am in danger everyday I drive my car, I never know if my brakes will fail on me. Or my car will burst out into flames, and I can smell fuel in the cabin of the car really strong, I have really bad gas mileage and my steering wheel is a lot stiffer than normal

- Santa Fe , NM, USA

problem #23

Mar 312021

Optima

  • miles
Malfunctions: hazard lights severe malfunction. All Steering wheel control buttons stopped working. Center control buttons stopped working. USB charging port/Auxiliary media port/ right side auxiliary power port lost power. Battery alternator and starter had acceptable readings via multimeter. Suspect ECM failure? Symptoms similar to misfires when A/C is running. Parking break doesn-€™t always engage despite proper method. Inconsistent gas consumption drastic fluctuations

- Las Vegas, NV, USA

problem #22

Mar 212022

Optima

  • miles
1. The O2 Sensor malfunctioned causing check engine light to come on. The Catalytic Converter failed or malfunctioned, an it is available for inspection upon request. 1wk after replacement of O2 Sensor installment, check engine light illuminated once again. [Official diagnosis was the catalytic converter was faulty but no mention of replacing 02 once catalytic converter was fixed]. 2. My safety as well as my children's safety was put at risk because there was and still is (even after repairs made from dealership where car was purchased) an issue with broken exhaust system and leak. A broken exhaust system poses extreme danger because it releases carbon monoxide (CO)- an odorless, tasteless, highly toxic gas, which can travel in passenger area and cause carbon monoxide poisoning. Overexposure to this odorless and colorless gas can cause death. Even in mild cases of exposure to CO can cause headaches, dizziness, nausea and fatigue. I need not mention that the extreme or excessive temperatures caused severe discoloration where the three- way catalyst is located. The pistons could have melted as well could have caught the car on fire.My safety as well as every occupant that ever traveled in the vehicle thus far, was at risk. The exhaust leak was big enough to affect the oxygen levels, to spring that code. Another safety risk was when owner of car was falling asleep at wheel of car while driving, not knowing there's a leak. This put the owner and the vehicles occupants at risk which is the greatest threat by far. 3. The problem has been confirmed by Rivard Buick GMC. 4. The vehicle has NOT been physically inspected by the manufacturer or police but has been insoected by insurance representatives. Yes there warning lampsthat appeared as the check engine light came on each time the exhaust system was malfunctioning. There was/ are other symptoms prior to the failure 1st appeared 11/01/21 o2 Sensor, 11/15/21 catalytic converter, 01/28/21 symptoms

- Lakeland, FL, USA

problem #21

Jan 232022

Optima

  • miles
My check engine light came on Sunday January 23rd. Upon Contacting my local Kia Dealership, I was told that my vehicle has recall # SC212 at which time was advised to bring my vehicle into the Kia dealership for diagnosis. On Friday, January 28th I dropped my vehicle off at my local Kia dealership and within 3 hours received a call from my Service Advisor who stated the following issues were found: 1. Oil leak; REPLACED: Valve cover gasket, high pressure fuel line, and high-pressureSe fuel pump bolts. 2. Recall SC212; REPLACED: Multi-Fuse and Fuse Box Cover per campaign instructions. 3. Serpentine Belt; REPLACED: Drive Belt 4. Brake Pads; REPLACED: Front Brake Pads and Machined Rotors. 5. Brake Pads; REPLACED: Rear Brake Pads, in addition to Replacing both rear rotors. 6. REPLACED: Cabin Air Filter 7. REPLACED: Engine air filter 8. Oil and Filter Change; Performed LOF, set tire pressures, and topped off all fluids. Less than 72 hours after the above repairs were complete, and a hefty $1,500 repair bill, my check engine light is BACK ON! My vehicle lacks acceleration when depressing the gas pedal and I am fearful my vehicle may have the defective Theta II Engine in it. I am a single parent with a 7 year old child and this has caused us to not feel safe driving our vehicle, not to mention I have had to miss multiple days of work and my daughter has missed several days of school now because we do not have a safe vehicle to commute to school and work in. Also, when searching my vehicles VIN number, it says the recall was not fulfilled? VERY CONCERING! I have the vehicle diagnostic data in my UVO Services account, in addition to itemized repair bill from Kia.

- Fort Myers, FL, USA

problem #20

Jan 092022

Optima 4-cyl

  • miles
THIS CAR HAVE PROBLEM ENGINE AND KNOCK SENSOR P1326. FUEL PROPUSION.SYSTEM. I LOST DAYS OF WORK..AND MONEY TOO.I LOST MY JOB Consumer stated vehicle is still in the dealership.

- Lake Elsinore, CA, USA

problem #19

Apr 202021

Optima

  • 122,000 miles
I was driving home from work and I noticed my vehicle having a hard time picking up speed and soon after it was a noticeable knocking noise coming from the engine. The RPM and dashboard gauges were very sporadic. I parked the car and popped the hood to find that there was somehow absolutely no oil, but no current sign of leaking from underneath. The car continues to knock when I start it up and am afraid of it overheating and it is currently parked. It smells definitely like burntness and when shifting into D3 and D it seems to be the most apparent that the engine could be having touble. Speeds and RPM gauge are most sporadic at high speeds and the exhaust pipe seems to have residue of some sort that isn't normal.

- Arlington, TX, USA

problem #18

Mar 302021

Optima

  • 86,000 miles
I was driving down the street came to a red light and when I tried to press the gas my wheels locked and the car wouldn't go. I had to push it down a hill and use neutral to get at least get the car off the main street and towed. The next day it was taken to Kia and now they are telling me they can't help because I couldn't provide receipts of any maintenance that was done on the car over time.

- Omaha, NE, USA

problem #17

Mar 222021

Optima

  • 65,000 miles
When you accelerate, for example to pass another vehicle, the vehicle will completely shut off, all lights illuminating on the panel the vehicle. The vehicle must be placed in park and restarted. Sometimes it starts right away, sometimes it takes a few minutes.

- Brookhaven, GA, USA

Read the next 16 complaints »

Not what you are looking for?