2015 Kia Optima engine problems
618 owner complaints filed with NHTSA name the engine on the 2015 Kia Optima — 62% of all complaints for this model year.
What owners report
“My girlfriend was driving on interstate 95 to pick me up from the metro. The engine suddenly cut off in a manner that appears to have melted the wiring harness of the vehicle, risking fire. She was able to safely get to the side of the road and call a tow. After taking it to a local repair shop…”
filed Jul 20, 2026
“While driving my 2015 Kia Optima, the engine failed completely without warning. The vehicle lost power while in motion approximately 300 miles away from my home. All warning lights illuminated and the car shut down during driving conditions, creating a serious safety hazard. The vehicle was towed…”
filed Jun 23, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar…
TSB_ENG222_R8 · Service Bulletin/Repair Instructions · issued Apr 3, 2025TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar…
TSB_ENG222_R7 · Service Bulletin/Repair Instructions · issued Feb 28, 2025
Engine problems in other Optima years
| Year | Reports | Share |
|---|---|---|
| 2020 Optima | 92 | 67% |
| 2019 Optima | 86 | 42% |
| 2018 Optima | 129 | 56% |
| 2017 Optima | 161 | 64% |
| 2016 Optima | 423 | 56% |
| 2014 Optima | 280 | 48% |
| 2013 Optima | 610 | 44% |
| 2012 Optima | 398 | 43% |
| 2011 Optima | 254 | 43% |
| 2010 Optima | 9 | 12% |
| 2009 Optima | 14 | 12% |
| 2008 Optima | 18 | 13% |
Other reported problem areas on the 2015 Kia Optima
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.