Problems · NHTSA complaints

2015 Kia Optima problems

Owners filed 1,011 complaints about the 2015 Kia Optima with NHTSA between Oct 2014 and Nov 2026. The most-cited component is engine (624).

Complaints
1,011
Filed with NHTSA
Crashes
31
Reported by owners
Fires
74
Reported by owners
Injuries
23
People reported injured
Deaths
1
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Engine624
  2. Electrical system135
  3. Structure76
  4. Steering69
  5. Service brakes49
  6. Power train49
  7. Fuel/propulsion system46
  8. Service brakes, hydraulic41
  9. Vehicle speed control36
  10. Engine and engine cooling31
  11. Air bags26
  12. Exterior lighting23
  13. Fuel system, gasoline10
  14. Electronic stability control (esc)10

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20142
201516
201622
201741
201864
2019108
202099
202183
2022136
2023159
2024118
2025111
202652

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Engine

624 reports9 crashes48 fires
“I was driving to work when all of the sudden I was pressing my gas, but I wasn't accelerating. I noticed my brakes and steering wheel were hard to push and turn. My car stopped in the middle of the road. I turned off my car and tried to turn the ignition and all I got was a single click. My engine, battery and oil lights were now on. They were not before. After 25 minutes in the middle of the road a sheriff came and pushed me to the side. When I put my car in neutral it was hard to steer and my brakes were hard to push. I was terrified that I was not going to be able to stop. I was scared I was going to be hit and someone would get seriously injured. I then received a call from Cascade Automotive saying that my engine seized from rod bearing failure but my engine was under warranty under the Kia Engine Class Settlement. I called Kia Consumer service and they said my Vin# qualified and was under warranty. I then had it towed to Kia of Puyallup. They confirmed it was a Rod Bearing failure that caused the seizure and told me it did qualify for the warranty. But then told me since I didn't get the HECU fuse update its void. I told them I never got a notice for the…”
Owner complaint to NHTSAFiled Nov 4, 2026EngineODI 11775778

Electrical system

135 reports4 crashes24 fires
“The contact owns a 2015 Kia Optima. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the rear taillight socket wiring harness failed to function as intended. The contact was informed that the brake lights were inoperable. The contact stated that the failure had occurred every 6–7 months. The contact stated that the repair was completed by the contact. The dealer was not made aware of the failure but provided no assistance. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 88,000.”
Owner complaint to NHTSAFiled Jul 29, 2026Electrical systemODI 11753610

Structure

76 reports4 crashes7 fires
“My 2015 white Kia Optima is having terrible paint peeling problems. It is peeling and chipping on the hood, along the sides of the windshield, above the wind shield, on my back bumper, above my back tires, and just about every place in between. PLEASE HELP!”
Owner complaint to NHTSAFiled Jul 5, 2026StructureODI 11748405

Steering

69 reports4 crashes2 fires
“This is a formal vehicle safety complaint regarding a manufacturer's active refusal to remedy a known safety defect under an active recall campaign guidelines.My 2015 Kia Optima Turbo experienced an active internal mechanical engine knock, violent sputtering, and a complete engine seizure. The vehicle is currently sitting un-driveable at an authorized Kia dealership.The required Knock Sensor Detection System (KSDS) software update was successfully completed on this vehicle prior to the incident, legally qualifying it for a 100% free long-block engine replacement under the manufacturer's active Lifetime Warranty extension. However, the dealership service department is actively withholding the safety warranty paperwork and refusing to submit the diagnostic photos and engine seizure data to corporate for warranty approval unless I agree to pay an additional $800 out of pocket for an external throttle body and O2 sensor.I have explicitly declined the retail accessory charges five separate times. I only authorize the replacement of my front sway bar links. Instead of separating the ticket and processing the free engine block safety remedy, the dealer is holding my…”
Owner complaint to NHTSAFiled Aug 13, 2026Steering, Engine, Fuel/propulsion systemODI 11756632

Service brakes

49 reports4 crashes5 fires
“I would say that the time this incident happened I was driving and me and me nephew were in car at time taking to shop to see why it was making a sound like air and all of sudden the car started swerving and slowing down and then it made a pop sound and smoke started coming from the car and I was thankful that I didn’t get hit but affraid and also hit my head in car due to the sudden jerk car mad and then it popped sound a d smoke came from good. The next day I have to pay to get back on the other side and also tow it home which it been parked since but I see a recall on my vin and want to find out how to get it to the nearest Kia to fix the recall”
Owner complaint to NHTSAFiled Jul 14, 2026Electrical system, Service brakesODI 11750184

Power train

49 reports1 crash1 fire
“P1326 code flashing engine light knock sensor went out 3 times in 6 months and just replaced it again and this time engine light didn't go off I was reading that there was a recall on this but apparently mine doesn't state it. Car cannot pass emissions if engine light is on and the 15th of June is approaching. The car doesn't make any sounds or nothing.”
Owner complaint to NHTSAFiled Jun 8, 2026Power train, EngineODI 11742779
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.