This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes or during normal driving operation.
full bulletin at NHTSA ↗2018 Hyundai Sonata lighting problems
moderate 18 complaints filed with NHTSA · avg repair $250 · see lighting across all vehicles →
Complaints
18
Recalls
0
Avg fix
$250
What stands out
No new NHTSA lighting complaint has been filed on this vehicle in over 8 years — the issue may be aging out of the active population.
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.
This bulletin provides information regarding condensation related to moisture accumulation in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. The TSB illustrates the various causes of condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes, or during normal driving operation.
full bulletin at NHTSA ↗This TSB provides information on the headlight pattern changes on certain 2018 MY Sonata (LFa), Elantra (ADa)(AD), Elantra GT (PD), Santa Fe Sport (AN), and Santa Fe (NC).
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Eighteen complaints center on multiple lighting defects in the 2018 Sonata. The dominant issue is low-beam headlight performance: owners consistently report the beams illuminate only 15–30 feet ahead—roughly one to two vehicle lengths—forcing reliance on high beams for safe night driving on dark roads. Dealers confirm the beams are aimed correctly but offer no fix.
Separately, owners report distinct black notches, lines, and center projections visible in the beam pattern during night driving. These shadows shift and dart when the vehicle turns or crests hills, creating a distracting visual interference many find dangerous. Hyundai responded in writing that the black shadow is an intentional anti-glare design to prevent blinding oncoming traffic and refused headlight replacement. Internal TSB 18-BE-003 confirms this shadow pattern is normal for LED units and directs dealers not to attempt adjustment.
Additional failures include headlight condensation present from delivery and persisting after unit replacement, melted fog lamp sockets with wiring issues, and backup lights that burn out repeatedly with circuit problems. One owner also reported the windshield resists water-repellent treatment for reasons the dealer could not identify. Dealers routinely told owners nothing could be done.
Same Hyundai Sonata lighting reports on nearby years: 2015 · 2016 · 2017 · 2019
Failure modes owners describe
Low-beam headlights with insufficient projection distance
Low beams aim too low or fail to project far enough in front of the vehicle, typically illuminating only 15–30 feet ahead instead of a safe distance. Owners report the light cutoff line appears very close to the front of the car. Dealers claim proper aim but offer no remedy.
When: From purchase or early ownership; one report at 1,700 miles
Symptoms owners cite: Lights only illuminate 15-30 feet ahead; Insufficient visibility on dark roads and highways; Road markings invisible at distance; No reaction time for hazards (animals, pedestrians); Requires use of high beams to see safely; Unsafe for turning on unlit roads
Repairs/costs cited: Dealers state headlights are aimed correctly or claim no fix available. Hyundai TSB 18-BE-003 indicates this is normal behavior for LED units and directs dealers not to attempt adjustment.
Recalls/TSBs owners mention: Hyundai claims design prevents glare to oncoming vehicles. TSB 18-BE-003 states shadows are normal for LED and no adjustment should be attempted. Dealers told customers nothing could be done.
Black shadows, notches, and projections in headlight beam
Drivers report distinct black lines, notches, half-moon or triangular shadows, and a center projection visible in the headlight beam during night driving. These appear to float and dart across the road when turning or going over hills, creating a distracting and disorienting effect in the line of sight.
When: Observable during night driving conditions
Symptoms owners cite: Black notches or half-moon shadow in middle of beam; Black line across road approximately 30 feet ahead; Shadows dart across path when turning; Shadows move when going up hills; Very distracting visual interference; Shadows visible when lights shine against a wall
Repairs/costs cited: Hyundai responded in writing that the black half-moon/triangular image is designed to prevent glare to oncoming traffic and refused replacement. Service says system works within specifications.
Recalls/TSBs owners mention: Hyundai's written response states the black image is an anti-glare design feature to prevent blinding oncoming drivers and refused to replace headlight assemblies. TSB 18-BE-003 confirms this is normal LED behavior. Dealers instructed not to attempt adjustment.
Headlight condensation and moisture inside lens
Moisture accumulates inside the headlight lens, distorting the projected beam. Present from day of purchase; replacement headlights exhibited the same problem or worse within a day of installation.
When: From purchase on 10/1/18; persisted through replacement in November 2018
Symptoms owners cite: Condensation visible inside lens from purchase day; Moisture covers good portion of glass; Distorts projected beam; Worsens in bad weather; Replacement headlights also developed condensation immediately
Repairs/costs cited: Dealership replaced headlights once, but new units also developed condensation within one day.
Recalls/TSBs owners mention: Hyundai acknowledged problem, took photographs for investigation, but could not identify root cause. Owner left waiting for replacement solution. Owner found other vehicles in area with same problem.
Fog light bulb socket melting and electrical issues
Fog lamp socket melts, causing plastic warping and connector failure. Bulb found burned with grease accumulation in socket. Electrical system issues including radio staying on after vehicle shutdown, possibly related to grease applied to door sensor.
When: Fog light issues in July 2018 and September 2018; radio staying on noted separately
Symptoms owners cite: Fog light socket melted (September 2018); Plastic warped from heat; Bulb connector will not lock; Left fog bulb previously burned; Grease found in socket; Radio stays on after vehicle locked; Brake light also required replacement
Repairs/costs cited: Fog lamp/DRL assembly removed and replaced in September 2018. Grease applied to socket and door sensor.
Backup lights failing and circuit issues
Backup lights burn out repeatedly, causing the harness light holder to burn out in turn. Fuse and bulb replacement does not restore function. Owner notes recall exists for 2011–2014 models but not their 2018.
When: Not specified
Symptoms owners cite: Backup lights constantly burn out; Light holder harness burns out; Lights do not come on after fuse replacement; Lights do not come on after bulb replacement; No warning before failure
Recalls/TSBs owners mention: Recall exists for 2011–2014 model years but not for 2018.
Windshield coating or surface issue preventing water treatment adherence
Rain-X and similar water-repellent treatments applied successfully to all other windows but fail to adhere or activate on the windshield. Dealership attempts scraping but cannot identify or remove any coating. No root cause determined.
When: Early in ownership
Symptoms owners cite: Rain-X does not work on windshield; Rain-X works on all other windows; Windshield appears heavily tinted or dark at night; Unknown coating or surface property prevents product adherence
Repairs/costs cited: Dealership spent considerable time scraping windshield but nothing was removed.
Synthesized from 18 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The headlights on my 2018 Hyundai sonata limited have condensation in them. It has been there from the day I bought the car on 10/1/18. That day the dealership took pictures to send to Hyundai and 1 month later replaced the headlights. But the new headlights were worse than the original and the day after they were installed I returned to the dealership where the parts manager took more pictures…
Dim headlights are very weak, not aimed correctly or poor design. Not enough candle power to see dividing lines on highway. With bright lights things are good. I have talked with 3 other people who have sonata's, different year models, they have the same complaint. Not safe! I would like to know how this high safety item passed the ntsb!!!!
Had lighting trouble with your 2018 Hyundai Sonata?
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 2018 Hyundai Sonata?
It's a documented issue but not catastrophic. 18 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?
Based on the 18 complaints filed, lighting issues most often appear around 4,859 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
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/2018/Hyundai/Sonata.
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.