NHTSA (USA)CriticalPark Outside
At a glance
What can fail
The hydraulic electronic control unit may short electrically, potentially causing an engine compartment fire while the vehicle is parked or driving.
What the fix does
This page covers 4 recalls, 1003 owner complaints, NHTSA crash-test ratings and EPA fuel economy for the 2015 Kia Optima.
24–37 mpg combined
6.4–9.8 L/100km
Midsize Cars
Fuel economy data from fueleconomy.gov (EPA / U.S. Dept. of Energy). Annual cost based on 15,000 mi/yr at 55% city driving and current fuel prices. MPG is U.S. gallons; L/100km converted. Ranges reflect the 3 tested variants for this model year.
5/5 Overall
NHTSA 5-Star Safety Rating
Engine complaints dominate what 2015 Kia Optima owners report, making up nearly half of all filed complaints for this model year. The most commonly described pattern is sudden or progressive engine failure, owners report loss of power, knocking, and in many cases complete engine seizure, sometimes with connecting rod failure that damages the engine block. These failures are described as occurring at highway speeds with little or no warning. Steering complaints make up the next notable group, with owners describing stiffness, unexpected changes in effort, or a loss of assisted steering feel. The electrical system draws a smaller but consistent set of reports, including warning lights appearing without clear cause and systems going into reduced-power or limp modes. A recurring paint complaint also appears across multiple reports, with owners describing the Snow White Pearl exterior finish bubbling, peeling, and chipping in various spots on the body panels.
1,003
Total Complaints
31
Crash-Related
71
Fire-Related
20
With Injuries
By System
The 2015 Kia Optima has 4 recalls, and three of them center on fire risk: brake fluid can leak into the anti-lock brake control unit, cause an electrical short, and start an engine compartment fire whether the vehicle is parked or moving.
The brake control unit fire risk was the subject of a prior repair attempt that did not fully resolve the problem, so some vehicles may be covered under more than one of these campaigns depending on their service history. On the engine side, vehicles that previously had their engine replaced under an earlier recall or warranty repair can develop a fuel leak near ignition sources, raising the risk of a fire in that same engine compartment. Taken together, the fire risks on this vehicle span two separate systems and persist even when the car is sitting still, which makes checking your VIN against active recalls a practical step.
At a glance
What can fail
The hydraulic electronic control unit may short electrically, potentially causing an engine compartment fire while the vehicle is parked or driving.
What the fix does
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Ratings from NHTSA's New Car Assessment Program (NCAP).
Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
Dealers will replace the HECU fuse at no charge to restore proper electrical function.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Brake fluid can leak inside the Hydraulic Electronic Control Unit, causing an electrical short.
What the fix does
Dealer will install a new multi-fuse and inspect the control unit for leaks, replacing it if needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Brake fluid can leak inside the Hydraulic Electronic Control Unit (HECU), potentially causing an electrical short that may affect braking function.
What the fix does
Dealers will inspect the HECU for brake fluid leaks and replace the unit if needed, at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The high pressure fuel pipe connecting to the fuel pump may have been damaged, misaligned, or improperly torqued during a previous engine replacement, causing potential fuel leaks.
What the fix does
Dealers will inspect and replace the fuel pipe as needed at no charge.
Summarized — see the official notice for exact wording, dates, and contacts.