Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
28,564 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 engine problems

engine 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

problem #7

Jun 102016


  • 23,490 miles


My 2015 Kia Optima has 23000 miles.. I couldn't remember when I had the oil changed, but I was driving on 75 coming from fla. The ac stop working and then shortly after that the car started to slow down. It finally came to a complete stop, when I got it to the Kia dealership they informed me that the engine had seized.because the said I could not prove that the oil had been changed, the warranty would not cover it. I bought the car brand new. Only had it 15 months. There was no warning lights or any signs of trouble.Kia will not fix it, they want almost 8.000 to put in a new engine.

- Riverdale, GA, USA

problem #6

Sep 042016


  • 35,000 miles
As I was driving my 2015 Optima to the store my check engine light came on. The next day I started my car and heard a rattling or ticking sound, this was on labor day, so I turned my car off and called the dealership. Due to holiday the service dept was not open. I called them again on Tuesday Sept 6th and was advised they would have it towed. I received a phone call on Tuesday evening stating my motor has sludge and needs to be replaced.

- Villa Rica, GA, USA

problem #5

Sep 032016


  • 47,000 miles
2015 Kia Optima, only 47K miles....engine failure...the dealership says its sludge... and I have to provide all my maintenance records. It started with white smoke coming out of the tailpipe and loud rattling noise when I accelerated, then this past Saturday, it started to shake violently and the check engine light went on. I had to get it towed. This is Kia's fault!!! not mine. I've done the same routine maintenance on my Toyota and Honda which had over 100K miles with no problems! I am being told by Kia that it won't be covered under the warranty.

- Corona, CA, USA

problem #4

Jun 042016


  • 26,456 miles


My 2015 Kia Optima has 26,456 miles. The last oil change was performed at 26,064 miles. On 6/4/16 while driving approx. 50mph in 3 lane traffic the engine seized up, car shut down and interior filled with smoke. Had vehicle towed to Kia. Was told it needs a new engine due to sludge in the oil. Kia is refusing to honor the warranty because I cannot produce receipts for previous oil changes. I have researched and many other Kia vehicles are having very similar problems with low miles! there has to be something wrong that Kia is not aware of or is just not willing to admit. Not only will they not fix my vehicle but I fear someone is going to get hurt or even killed. I informed Kia of my concern but they did not seem to care.

- San Antonio, TX, USA

problem #3

Oct 152015


  • 58,000 miles
The contact owns a 2015 Kia Optima. While driving 60 mph, smoke emitted from the engine compartment without warning. The vehicle was taken to the dealer. The technician diagnosed that the number two cylinder was defective and needed to be replaced. The vehicle was not repaired. The failure mileage was 58,000.

- George Town, SC, USA

problem #2

Oct 272015


  • miles
I purchased my car in the greater san diego area back in June 31. 2015. Have approximately 8K miles on my vehicle and notice around 3K my car would jerk when coming to a complete stop. This has happened a few times approximately 3-4 time (average once a month).and today 10-27-2015, my car once again jerk but this time the engine made a unfamiliar sound. I will be taking it to the dealership as soon as car has received all schedule maintenance; per owner manuel. It has passed all Kia certifed dealer/mechanic inspection when taken in. Also, when the contact to purchase was signed it did not get a full inspection as the dealership was closing and the appropriate staff for inspection had left for the day. Notice when I got home the front passenger signal light did not work. Called the dealership to get my new car fixed and had to wait for approximately 3-5 days for the repair, at that point it also passed thier inspection.

- Chula Vista, CA, USA

problem #1

Jan 062015


  • 10,000 miles
The contact owns a 2015 Kia Optima. The contact stated that while driving 25 mph, the vehicle made an abnormal noise without warning. The contact mentioned that the noise was emitting from the engine. The failure recurred several times. The vehicle was taken to the dealer. The technician was unable to diagnosed or repair the vehicle. The manufacturer was notified of the failure. The failure mileage was 10,000.

- Milford, PA, USA

Not what you are looking for?