2018 Kia Optima Electrical System Problems
NHTSA component category: ELECTRICAL SYSTEM · data through 07/12/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How electrical system ranks on this vehicle
Share of the 228 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 Kia Optima overview page.
What owners report
“The engine consumes all the oil within 1000 miles. The oil light comes on around 800 miles after oil change. The dealership did the 3…”NHTSA complaint 11519357 — filed 04/27/2023
“Normally, when the doors are open my car will tell me. The doors notify me that they're open but my trunk was not showing that…”NHTSA complaint 11493460 — filed 11/14/2022
“Rough idle, chugged along before killing engine power. Has happened a couple of times. No check engine light has come on”NHTSA complaint 11486765 — filed 09/27/2022
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Electrical System complaints by year filed
Frequently asked questions
Does the 2018 Kia Optima have electrical system problems?
Electrical System is the #3 most-reported problem area on the 2018 Kia Optima: 31 of 228 complaints on file (13.6%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2018 Kia Optima have in total?
228 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 9 involved a crash, 10 involved a fire, 8 reported injuries, and none reported deaths.
What does NHTSA's electrical system category include?
NHTSA assigns each complaint to standard component categories; this page reports the ELECTRICAL SYSTEM category exactly as NHTSA defines and records it.
