2015 Kia Optima: problems, recalls and what it’s worth
NHTSA has 1 open defect investigation (not a recall). Known weak spot on this generation: Theta II 2.0T / 2.4L GDI engine. 4 recall campaigns to confirm with a dealer. A lot of owner complaints, 64% about engine & cooling.
Cold-start knock/rattle that fades as it warms, oil consumption, a check-engine light for the knock sensor. Confirm the KSDS software recall was performed and ask whether the engine was ever replaced.
Known problems on the 2015 Kia Optima
Theta II 2.0T / 2.4L GDI engine $4,000–$7,000 to fix
If equipped with the 2.4L or 2.0T Theta II GDI (most were), this generation has a documented rod-bearing failure — knocking, then seizure or fire. Covered by huge recalls, a class-action settlement, and a knock-sensor software update (KSDS); a lifetime warranty applies to many, but only for the original-owner chain in some cases.
Check for: Cold-start knock/rattle that fades as it warms, oil consumption, a check-engine light for the knock sensor. Confirm the KSDS software recall was performed and ask whether the engine was ever replaced.
Basis: NHTSA recalls 15V568/17V226/others; Hyundai/Kia engine class-action settlement; KSDS campaign
Known patterns for this year and model, not findings about one car. A well-kept example may already have had the fix. Costs are rough US shop prices.
2015 Kia Optima recalls
NHTSA lists 4 recall campaigns for the 2015 Kia Optima. Repairs are free at a dealer for the brand, and a dealer can confirm by VIN which were already done.
- BrakesPark outsideFire risk
An engine compartment fire while parked or driving can increase the risk of injury.
Details 23V652000
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 experience an electrical short, which can result in an engine compartment fire while parked or driving.
Fix: Owners are advised to park outside and away from structures until the recall repair is complete. Dealers will replace the HECU fuse, free of charge. Interim notification letters, notifying owners of the safety risk, were mailed November 14, 2023. Owner notification letters were mailed March 29, 2024 through June 18, 2024. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC284.
- BrakesPark outsideFire risk
An electrical short in the HECU increases the risk of a fire while parked or driving.
Details 21V331000
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.
Fix: Owners are advised to park outside and away from other vehicles and structures until the recall repair is completed. Dealers will install a new multi-fuse, and inspect the HECU for leaks, replacing the HECU if necessary, free of charge. Owner notification letters were mailed on July 2, 2021. This recall supersedes previous NHTSA recall number 20V-519. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC212.
- BrakesPark outsideFire risk
If the HECU short circuits, there is an increased risk of an engine compartment fire.
Details 20V519000
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.
Fix: Kia will notify owners, and dealers will inspect the HECU for leaking brake fluid and replace the HECU if necessary, free of charge. Owners are advised to park outside and away from other vehicles and structures until the recall repair is completed. The recall began October 20, 2020. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC197.
- Fuel systemFire risk
A fuel leak in the presence of an ignition source can increase the risk of a fire.
Details 18V907000
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 pipe that connects to the fuel pump outlet may have been damaged, misaligned or improperly torqued during the engine replacement procedure, possibly causing a fuel leak.
Fix: Kia has notified owners, and dealers will inspect and replace the fuel pipe, as necessary, free of charge. The recall began January 17, 2019. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC172.
2015 Kia Optima safety investigations and free repairs
Under investigation (not a recall):
- Hyundai and kia abs module fires since Nov 2023
Ask the seller if the car has had this problem.
Free repairs to ask about (warranty extensions):
- Doors and locks: Kia has developed a software upgrade that can be installed on the vehicle to restrict the operation of the vehicle's ignition system should a locked vehicle be the subject of a break-in and theft attempt without the key.
- Battery: This bulletin provides information associated with the "Hybrid System Warranty Extension Program" (WTY029) to inspect and, if necessary, replace the…
- Exhaust and emissions: Kia has determined that the following kia vehicles originally sold or currently registered in states where heavy amounts of road salt are used, may exhibit an evaporative canister leak due to prolonged exposure to road salt
A dealer for the brand can check these by VIN.
Source: NHTSA, Sep 24, 2026.
2015 Kia Optima safety and fuel
From NHTSA’s crash tests and the EPA’s fueleconomy.gov.
What owners complain about
1,008 complaints filed with NHTSA for this year and model, which is a lot.
Share of complaints that mention each area. One complaint can mention several.
Other Kia Optima years
Printable inspection checklist · Out-the-door price calculator