Built from official NHTSA complaint and recall data · data through 07/12/2026
High complaint levelIts most-reported problem — Engine — runs 4.9× the fleet median for that category across the 2583 model-years tracked on this site.
228Complaints
2Recalls
9Crashes
10Fires
8Injured
0Deaths
Source: U.S. NHTSA complaint & recall data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
Is this problem acknowledged?
The most-reported problem — Engine (56.6% of complaints) — recall and investigation status for this vehicle is currently unavailable.
Engine complaints here are 4.9× the median for that category across the 2583 model-years tracked on this site.
Complaint category
Reports
Official status
Reference
Engine
129 · 56.6%
not available
—
Electrical System
31 · 13.6%
not available
—
Power Train
18 · 7.9%
not available
—
Service Brakes
17 · 7.5%
not available
—
Exterior Lighting
13 · 5.7%
not available
—
Fuel/propulsion System
13 · 5.7%
not available
—
Recalled = an NHTSA safety recall covers this category, so a free repair exists. Under investigation = NHTSA has an open probe but no recall yet. Investigation closed = NHTSA examined it and closed the probe — this is not a defect finding; where a closed probe led to a recall we name the campaign. Not available = recall or investigation data could not be confirmed for this vehicle — it is not a “no”. Categories are matched by NHTSA's top-level component. Check your VIN at nhtsa.gov/recalls.
Percentages are the share of the 228 complaints citing each component; one complaint can cite several components. “Unspecified / other” is NHTSA’s own catch-all category — we show it rather than hide it.
If the VPD activates while the vehicle is being operated in Electric Vehicle (EV) mode, there may be a loss of power, increasing the risk of a crash. Recall repairs are free at authorized dealers.
PARK-IT: NO · PARK-OUTSIDE: NO · OVER-THE-AIR FIX: NO
A person inside the trunk compartment may become trapped, increasing their risk of injury. Recall repairs are free at authorized dealers.
PARK-IT: NO · PARK-OUTSIDE: NO · OVER-THE-AIR FIX: NO
Park itPark outside Specimen badges — shown on a recall card only when NHTSA sets the flag. None of the campaigns above carries either flag. Always check your own vehicle by VIN at nhtsa.gov/recalls.
What owners report
“-Knock Sensor Detection System - ECU Logic Improvement - I Was driving with my infant son in the backseat. I was going 70 mph when…”NHTSA complaint 11524617 — filed 05/31/2023 · ENGINE
“Car smoking white , and driving slow after I hit a pothole when it was raining hard.”NHTSA complaint 11524344 — filed 05/29/2023 · ENGINE
“The contact owns a 2018 Kia Optima. The contact stated that the vehicle was sputtering while being started. The contact stated that the vehicle also…”NHTSA complaint 11522447 — filed 05/17/2023 · ENGINE
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Complaint trend by year filed
Frequently asked questions
What are the most common problems with the 2018 Kia Optima?
Engine issues are the most-reported category, cited in 129 of 228 NHTSA complaints (56.6%), followed by unspecified/other issues (37), electrical system (31), power train (18). Complaints are unverified owner reports.
How many complaints does the 2018 Kia Optima have?
228 complaints were on file with NHTSA as of 07/12/2026. Of those, 9 involved a crash, 10 involved a fire, and 8 reported injuries. No deaths were reported.
Does the 2018 Kia Optima have any recalls?
Yes — 2 NHTSA safety recall campaigns, including campaign 18V161000. Recall repairs are free at authorized dealers. Check your specific vehicle by VIN at nhtsa.gov/recalls.
Has NHTSA acted on the 2018 Kia Optima's reported problems?
Recall or investigation data is partly unavailable for this vehicle right now — check your VIN at nhtsa.gov/recalls for the authoritative answer.
Is a complaint proof of a defect?
No. Complaints are reports submitted by consumers to NHTSA. NHTSA does not verify individual complaints, and a complaint is not proof that a defect exists.
About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/12/2026.
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