2018 Kia Optima Plug-in: True Cost, Problems & Verdict
243 NHTSA owner complaints · 0 recalls · data-computed verdict. No opinions — public data only.
Owner complaints: 243 filed with NHTSA
Complaints per year on the road: 30.38
What owners say
Verbatim reports filed with the United States safety regulator (NHTSA) by owners of this exact model year. Public record.
The contact owns a 2018 Kia Optima. The contact stated that upon starting the vehicle, the vehicle jerked abnormally. The failure persisted while driving, and the vehicle lost motive power. The contact was able to restart the vehicle; however, the failure persisted while driving. The vehicle was towed to a dealer to be repaired under an unknown recall for an engine software update and key fob replacement; however, th…
The contact owns a 2018 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate and failed to exceed 52 MPH. The vehicle shut off. The contact stated that the engine was running rough while stationary and the vehicle shut off without warning. The vehicle was taken to an Auto Parts Store, where it was diagnosed, and it was determined that the vehicle was in LIMP Mode…
I was run off the road by a drunk driver I hit a tree at 35MPH MY AIR BAGS DID NOT DEPLOY NOR DID MY SEAT BELT LOCK!!!! I NOW HAVE MULTIPLE INJURIES I HAVE BROKEN BONES ALL THROUGHOUT MY FACE!!!!! A SEVERE CONCUSSION!!!!! Any time I call the the customer care center and try and get information or call someone I either get hung up or gave the run around and then hung up on my mother in law has also tried calling and h…
Recalls: 0 campaigns
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What it costs to buy — and what owning it really takes
Class-level estimates, priced as a mid-size car of its model year, re-priced to your country. Not a quote, not a valuation of one specific car — condition, mileage and options move it. How these are computed.
What it costs to run
EPA combined 40 MPGe · estimated annual energy cost $1,600 · EPA range 29 mi
Re-priced automatically from your country's retail fuel, electricity and parts indices — change country in the bar at the top. Estimates; see methodology.
What this car's problems cost to fix
Ranked by the components owners of this exact model year actually complain about. Each figure is flat-rate labour hours x the local shop rate plus a parts band — an estimate of what this kind of failure costs, not a quote, and not a prediction that this car will need it. Formula.
- Engine137 complaints · typical job: Cooling-system or timing-drive repair (6.0 h labour + parts)$1,040–$2,220
- Unknown Or Other40 complaints · typical job: Diagnosis and mixed repair (2.0 h labour + parts)$360–$940
- Electrical System37 complaints · typical job: Alternator, battery-drain or body-module diagnosis and replacement (3.0 h labour + parts)$540–$1,310
- Power Train20 complaints · typical job: Transmission service or clutch-pack repair (7.0 h labour + parts)$1,290–$4,040
- Service Brakes17 complaints · typical job: Pads, rotors and caliper service, both axles (3.0 h labour + parts)$580–$1,140
- Engine And Engine Cooling15 complaints · typical job: Water pump, thermostat and coolant service (3.5 h labour + parts)$600–$1,040
Other Kia Optima Plug-in years
Kia Optima Plug-in years to avoid, and the best years to buy →
FAQ
What is the most common problem with the 2018 Kia Optima Plug-in?
The most-reported issue in NHTSA complaint data is Engine (137 complaints in our indexed sample).
Is the 2018 Kia Optima Plug-in a good used car to buy?
Our data verdict is CAUTION with a reliability score of 63/100, computed from 243 NHTSA complaints and 0 recall campaigns. See the verdict card for the top reasons.
How much does it cost to fix the 2018 Kia Optima Plug-in's most common problem?
137 of the NHTSA complaints filed against the 2018 Kia Optima Plug-in sit in the Engine group — more than any other component on this model year. The representative job there is cooling-system or timing-drive repair: about 6.0 hours of labour plus parts, roughly $1,040–$2,220 at a US independent shop and re-priced to your country at the top of the page. It is an estimate of what this class of failure costs, not a quote for this car.
What does a 2018 Kia Optima Plug-in cost to run per year?
About $3,966 a year in fuel or energy plus the maintenance band — roughly $19,832 over five years, before purchase price, insurance and depreciation. Figures come from available EPA fuel-economy data and industry maintenance averages, and are re-priced to your country.
Compare with
Other midsizes of about the same age.
What will a 2018 Kia Optima Plug-in really cost YOU per year?
Fuel, maintenance band and depreciation — computed from public data in 10 seconds.
Open the true-cost calculatorData sources
Complaints & recalls: NHTSA ·
Fuel economy: EPA fueleconomy.gov ·
Scoring: our published methodology.
Maintenance bands are industry-average estimates (AAA Your Driving Costs, CarMD index) — labeled estimates, not measurements.
Last updated: 2026-10-04.
Strong evidence — 243 complaints, 0 recalls on record
- 243 NHTSA complaints on record (30.4/yr of exposure) — worse than a typical year of this model (16.0/yr)
- 0 recall campaigns, 0 touching safety-critical systems