TECHNICAL SERVICE BULLETIN: INFORMATION FOR HEADLAMP CONDENSATION AND MOISTURE - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information relating to some Kia models that may exhibit fogging, condensation, and/or moisture inside a headlamp assembly. Generally, a fogging condition is considered normal and can be eliminated by turning on the headlamps with the engine running for up to 30 minutes or during normal driving conditions. Headlamp assembly replacement WILL NOT be necessary in most cases.
full bulletin at NHTSA ↗2016 Kia Optima lighting problems
moderate Owners of the 2016 Kia Optima have filed 38 NHTSA complaints about the lighting, typically surfacing around 55,300 miles at roughly $250 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See lighting across all vehicles →
Failure mileage
Complaints
38
Recalls
0
Avg fix
$250
| Model year | lighting complaints |
|---|---|
| 2012 Optima | 17 |
| 2013 Optima | 26 |
| 2014 Optima | 14 |
| 2015 Optima | 14 |
| 2016 Optima (this page) | 38 |
| 2017 Optima | 11 |
| 2018 Optima | 9 |
When does it fail?
Of the 38 lighting complaints filed for the 2016 Kia Optima, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 38 lighting complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 12 model years of Kia Optima in our records for lighting problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering lighting on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
TECHNICAL SERVICE BULLETIN: HALOGEN HEAD LAMP LOW BEAM BULB CONNECTOR REPLACEMENT - This bulletin provides information regarding the procedure to repair the bulb connector on some 2010MY~ vehicles listed on the table below, which may exhibit a bulb connector concern. To correct this concern, replace the connector with a new and improved part.
full bulletin at NHTSA ↗TSB - SERVICE ACTION: OUTSIDE REAR COMBINATION LAMP HARNESS REPLACEMENT (SA334) - This bulletin provides the procedure to replace the outside rear combination lamp harness on some 2016-2017MY Optima (JFa) vehicles, produced from September 25, 2016 through March 16, 2017, which may exhibit an intermittent inoperative brake light with the possibility of a ?Check brake light? warning on the instrument cluster display.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners describe the 2016 Optima as having chronic lighting electrical issues. The dominant problem is headlights in AUTO mode shutting off randomly while the vehicle is in motion, sometimes with dashboard light indicators cycling between AUTO and OFF. The blackout typically lasts seconds to minutes and requires toggling the headlight switch to restore function. Owners report this happens on highways, city streets, and back roads—often when using turn signals—making night driving dangerous. Dealers consistently fail to reproduce or diagnose the fault.
Beyond AUTO mode failures, owners report the auto mode activates lights on bright days and fails to activate in darkness, the opposite of intended behavior. Moisture regularly infiltrates taillight and headlight assemblies, corroding LED ribbons and causing bulbs to burn out every few months; one owner replaced nine taillights in four years despite warranty coverage. Some owners cite wiring harness deterioration and melting, creating dim or non-functional lights and potential fire risk.
Secondary electrical issues include parking lights turning on overnight while parked, passenger brake lights extinguishing when headlights activate, headlight flicker tied to turn signal use, and poor beam pattern that fails to illuminate road sides. Dealers rarely find actionable faults during inspections.
Same Kia Optima lighting reports on nearby years: 2013 · 2014 · 2015 · 2017
Failure modes owners describe
Headlights shutting off randomly in AUTO mode
Headlights disable intermittently while driving, most often when the light control is set to AUTO. Owners report the exterior headlights and sometimes dashboard lights go completely dark for several seconds to minutes, then illuminate again without driver input. The malfunction occurs both day and night, on highways and city streets, and sometimes correlates with use of the turn signal. Reactivating involves toggling the headlight switch or briefly switching to manual ON then back to AUTO.
When: Occurs intermittently across all reported mileages; one complaint at 69,500 miles
Symptoms owners cite: Headlights shut off completely while driving; Exterior and sometimes interior lights go dark simultaneously; Turn signal may trigger the malfunction; Dashboard light indicator shows AUTO setting switching to OFF; Lights reactivate with switch manipulation
Repairs/costs cited: Dealers unable to reproduce or identify root cause in most cases. One complaint mentions multifunction switch repair attempted; another mentions headlight switch inspection with no issues found.
Auto headlight mode malfunctioning—lights on/off inappropriately
The AUTO mode for headlights operates erratically, turning lights on during daylight hours and off in darkness independent of ambient light changes. When set to manual ON mode, lights function normally. Owners report the system is behaving opposite to design intent, creating safety hazards especially at night.
When: Occurs intermittently; no specific mileage noted
Symptoms owners cite: Lights activate automatically on bright sunny days; Lights deactivate in dark conditions without driver input; No correlation to actual environmental lighting; Manual mode functions properly as control; Issue is intermittent and difficult to diagnose
Headlight assembly moisture ingress and LED failure
Taillight and headlight assemblies are not water-tight. Moisture collects inside during wet weather, causing LED ribbons to corrode and fail. Owners report replacing taillights multiple times under warranty (within 60,000 miles) and out-of-pocket after warranty expires. One owner replaced nine taillights in four years.
When: Occurs after rain or wet conditions; failures reported throughout ownership
Symptoms owners cite: Moisture visible inside light assembly after rain; LED ribbon corrosion and darkening; Complete light failure; Repeated failures requiring replacement
Repairs/costs cited: Kia replaces under warranty to 60,000 miles; replacement cost approximately $500 per taillight unit after warranty. One owner reports nine taillight replacements in four years.
Recalls/TSBs owners mention: Covered under 60,000-mile warranty; no coverage beyond.
Headlight wiring harness deterioration
Wiring harness connected to headlight assembly melts or degrades, causing bulbs to burn out frequently. One owner reports bulbs failing every three months, and notes the condition may present a fire hazard in addition to visibility loss.
When: Recurring; bulb burnout cycle every 3 months reported
Symptoms owners cite: Bulbs burn out frequently; Wiring harness visibly melted or damaged; Headlights very dim; Potential for fire hazard
Repairs/costs cited: Requires wiring harness replacement and bulb replacement
Headlight beam pattern poor—inadequate side-to-side illumination
Headlights illuminate only the road directly ahead with minimal spread, making road signs on the sides invisible at night. Visibility is substantially reduced on country roads and unlit areas, creating a safety hazard.
When: Observed at night on country roads
Symptoms owners cite: Headlights do not fan out across road width; Side-to-side visibility poor; Cannot read road signs on sides of road; Overall visibility at night severely reduced
Parking lights activating and deactivating on their own
Parking lights turn on automatically while the vehicle is parked with the engine off, then deactivate hours later without driver input. This drains the battery and indicates an electrical control issue.
When: Overnight, while parked with engine off
Symptoms owners cite: Parking lights illuminate without ignition on; Lights remain on for several hours; Automatic deactivation without driver input
Brake light and headlight interaction—passenger brake light extinguishes when headlights on
When exterior headlights are illuminated, the passenger-side brake light goes out. The brake light functions normally when headlights are off. This indicates a wiring or relay fault affecting both circuits simultaneously.
When: Occurs consistently when headlights are on
Symptoms owners cite: Passenger brake light dark when headlights on; Brake light functions normally when headlights off; Occurs both while driving and parked
Headlights flicker or dim when turn signal activated
Operating the turn signal causes headlights to flicker or briefly dim. The issue suggests a voltage or wiring interaction between the turn signal circuit and headlight circuit.
When: When turn signal is activated while driving
Symptoms owners cite: Headlights flicker when turn signal used; Brief dimming coinciding with signal activation
Synthesized from 38 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Mid september, 2020, I began to notice that my headlights would turn off as I was driving. They would cut off for no more than 15 seconds and turn back on. I didn't think anything of it, until I started having issues with other components of my 2016 Kia optima. On 11/30/2020 I was driving at 30mph through a residential area. As I was approaching a stop sign, my engine light came on. When I tried…
Had lighting trouble with your 2016 Kia Optima?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the lighting problem on the 2016 Kia Optima?
It's a documented issue but not catastrophic. 38 complaints have been filed. Repairs average $250 and most owners catch it before it causes a breakdown.
At what mileage does the lighting typically fail?
Across the 19 complaints that reported odometer mileage, most lighting failures cluster between 35,000 and 62,000 miles, with the median around 55,300. A quarter of owners report trouble before 35,000; a quarter make it past 62,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $250 for lighting repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to lighting?
No active recalls currently cover lighting issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2016/Kia/Optima.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.