Owners have filed 998 safety complaints about the 2015 Kia Optima with U.S. regulators. Here's what the federal data shows, system by system.
Complaints for this vehicle report 31 crashes, 71 fires, 23 injuries, 1 death.
Complaints filed with NHTSA name the vehicle system involved. For the 2015 Kia Optima, engine & cooling issues stand far above everything else.
"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."
"Was driving down the interstate and the engine lost some power and the engine blew and parts of the connecting rod was on the outside of motor which blew a hole in the block and oil went into the intake manifold and pieces of the piston ring was in there and engine shut off, and seen that this has been a problem with these cars"
For most vehicles, complaint volume spikes early and tapers off. The 2015 Kia Optima peaked later than usual, in 2023.
4 recalls apply to some or all 2015 Kia Optima vehicles. Recall repairs are free at any dealer, with no time limit.
Kia Motors America (Kia) is recalling certain 2011-2017 Optima, 2012-2017 Sorento and 2011-2018 Sportage vehicles that previously received an engine replacement under recall number 17V-224, warranty, or the Knock Sensor Detection System (KSDS) Product Improvement Campaign. The high pressure fuel pip…
Kia Motors America (Kia) is recalling certain 2013-2015 Optima and 2014-2015 Sorento vehicles. Brake fluid may leak inside the Hydraulic Electronic Control Unit (HECU), possibly resulting in an electrical short.
Kia Motors America (Kia) is recalling certain 2013-2015 Optima and 2014-2015 Sorento vehicles previously recalled under recall 20V-519. Brake fluid may leak inside the Hydraulic Electronic Control Unit (HECU), possibly resulting in an electrical short.
Kia America, Inc. (Kia) is recalling certain 2010-2019 Borrego, 2014-2016 Cadenza, 2010-2013 Forte, Forte Koup, Sportage, 2015-2018 K900, 2011-2015 Optima, 2011-2013 Optima Hybrid, Soul, 2012-2017 Rio, 2011-2014 Sorento, and 2010-2011 Rondo vehicles. The Hydraulic Electronic Control Unit (HECU) may …
Recall repairs are free at any dealer, with no time limit. Look up your 17-character VIN on the official NHTSA site to see open recalls for your specific vehicle. Check your VIN at NHTSA.gov →
NHTSA crash ratings measure how the car protects occupants in a crash — a separate question from the reliability complaints above. A vehicle can be both crashworthy and trouble-prone.
As of July 14, 2026, owners have filed 998 complaints about the 2015 Kia Optima with NHTSA. The most-reported system is engine & cooling.
The 2015 Kia Optima has 4 NHTSA recalls on file. Recall repairs are free at any dealer.
NHTSA gives the 2015 Kia Optima an overall crash rating of 5 out of 5 stars. Crash ratings measure occupant protection in a collision; they do not measure reliability, which is what the complaint data above reflects.
All figures come from the U.S. National Highway Traffic Safety Administration (NHTSA) public APIs: the Office of Defects Investigation complaint database, the recalls database, and NCAP safety ratings, retrieved July 14, 2026.
Complaints are self-reported by consumers and are not verified by NHTSA or by this site. A single complaint may cite multiple vehicle systems, so system mentions can sum to more than the complaint total. Complaint volume is influenced by fleet size, media attention, and recall notices, and is not by itself a measure of defect rates.
This site is not affiliated with NHTSA or any manufacturer. Nothing here is repair, purchase, or legal advice. For your specific vehicle, use the official NHTSA VIN lookup and consult a qualified technician.