TECHNICAL SERVICE BULLETIN: HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) BLOWER MOTOR FUSE RELOCATION - This bulletin provides the procedure to relocate the Heating, Ventilation, and Air Conditioning (HVAC) blower motor 40-ampere fuse on some 2016-2020MY Optima (JFa) vehicles produced from August 28, 2015 through June 23, 2020 which may experience an inoperative blower motor due to a blown multi-fuse at position #3. The HVAC system provides cooling and heating to help maintain a comfortable environment inside the vehicle cabin. The blower motor provides primary airflow for the HVAC system. Extended use of the HVAC system at high fan speeds may cause damage to the multi-fuse terminals fo
full bulletin at NHTSA ↗2016 Kia Optima visibility problems
moderate Owners of the 2016 Kia Optima have filed 22 NHTSA complaints about the visibility, typically surfacing around 69,600 miles at roughly $350 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See visibility across all vehicles →
Failure mileage
Complaints
22
Recalls
0
Avg fix
$350
| Model year | visibility complaints |
|---|---|
| 2012 Optima | 20 |
| 2013 Optima | 17 |
| 2014 Optima | 11 |
| 2015 Optima | 5 |
| 2016 Optima (this page) | 22 |
| 2017 Optima | 4 |
What stands out
Among the 10 model years of Kia Optima in our records for visibility problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering visibility 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: WINDOW REGULATOR DRUM GEAR REPLACEMENT - This bulletin provides the procedure to replace the window regulator drum gear on some 2016-2017MY Optima (JFa) vehicles, produced from September 01, 2015 through July 31, 2016, which may exhibit an inoperative window regulator due to a drum gear separating and/or breaking.
full bulletin at NHTSA ↗PITSTOP: OUTSIDE MIRROR GLASS CONTROL INOPERATIVE - This Pitstop provides information on the repair procedure for an inoperative mirror glass on the outside door mirrors for 2016-2019MY Optima (JFa) and Sorento (UMa) vehicles.
full bulletin at NHTSA ↗TSB: DEFOGGING LOGIC ? NORMAL OPERATION, DISABLING, AND ENABLING - Starting with 2010MY, all Kia vehicles, except Rio (JB), incorporate a defogging logic to prevent the interior windows from becoming excessively fogged. Depending on the specific model, the HVAC control head monitors ambient temperature and/or cabin humidity to determine which settings will best prevent the windows from fogging. If the system detects lower ambient temperature or higher cabin humidity, the defogging logic may automatically switch ON the A/C, and/or set the air intake mode to Fresh Air. If the user changes these settings, the defogging logic will take control again after 3 to 5 minutes, depending on the procedu
full bulletin at NHTSA ↗TSB: SERVICE ACTION: PANORAMIC SUNROOF INSPECTION AND REPAIR (SA270) - This bulletin provides information on some 2016MY Optima (JFa) vehicles, produced from September 28, 2015 to August 8, 2016, which may exhibit a buzzing noise that may increase with intensity in conjunction with the HVAC fan speed, a popping or clicking noise when driving over bumps or turning, and/or a loose folding cover, depending on the vehicle production date. For details regarding each type of inspection/repair, refer to its respective section below. Before conducting the procedure, verify that the vehicle is included in the list of affected VINs.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Power window regulators are the dominant complaint. Owners report windows dropping unexpectedly during highway driving (25–75 MPH), sometimes all four windows failing within days or weeks of each other. At 48,000 to 156,000 miles, multiple windows commonly go inoperable or stuck partially open. Owners describe gear disintegration or corrosion inside the regulator housing. A service bulletin (SA418) confirms Kia knows this is endemic to the model. Replacement costs $600–$650 per motor; parts are frequently backordered with no interim solution from dealers. Warranty doesn't cover the failures.
Sunroof glass shattering without impact is the second major hazard. Owners report loud explosions at 30–55 MPH and while parked, with glass fragmenting outward at low mileage (one at 5,000 miles). One owner mentioned learning of a lawsuit. No recall emerged in these narratives.
One owner describes rear windshield degradation—increasing cloudiness and haze that blocks visibility, especially at night. Dealers deny warranty and claim unfamiliarity with the issue.
A single owner reports daytime running lights blinking on and off unpredictably, rendering night driving unsafe. The dealer couldn't replicate it, and the manufacturer offered no real help.
Same Kia Optima visibility reports on nearby years: 2013 · 2014
Failure modes owners describe
Power Window Regulator Failure
Window regulators fail, causing windows to drop unexpectedly while driving or sit partially open. Gears disintegrate or corrode. Multiple windows commonly fail on the same vehicle, sometimes within days or weeks of each other. Owners report windows dropping at highway speeds (25–75 MPH), creating safety hazards for passengers and allowing rain/debris into the cabin.
When: Between 48,000 and 156,000 miles; some failures occur early (under 50k miles) while others emerge later
Symptoms owners cite: Window drops suddenly while driving, sometimes without driver input; Window fails to roll up when switch is depressed; Window stuck partially open; Multiple windows fail sequentially on the same vehicle; Window opens independently without driver input; Loud banging or grinding sound associated with failure
Repairs/costs cited: Replacement window regulator motor typically $600–$650 per unit; replacement regulator gear/assembly approximately $200 for parts alone. New regulators shipped with blue gear instead of original white gear. Parts frequently backordered; dealers unable to provide interim solutions. Some owners report needing to manually prop windows or use paper/car covers as workarounds.
Recalls/TSBs owners mention: Service Bulletin SA418 acknowledged the defect as a common problem for this model/year. One owner cited undisclosed NHTSA recall related to window failure. Dealers commonly inform owners repairs are not covered under warranty and at owner expense. Manufacturer has not provided broad remedial program despite acknowledged pattern.
Sunroof Glass Spontaneous Shattering
Sunroof glass panel shatters or explodes outward without impact, collision, or driver action. Failure occurs during normal driving at moderate speeds (30–55 MPH) and also while parked. Shards scatter into roadway or passenger compartment, creating serious safety risk for occupants and following vehicles.
When: Between 5,039 and 80,500 miles; no mileage correlation evident
Symptoms owners cite: Loud explosion or bang heard during driving; Sunroof glass shatters or explodes outward without warning; Glass shards enter cabin or scatter on roadway; Sunroof glass fractures during normal operation
Repairs/costs cited: Sunroof replacement required. One owner reported dealer repair denied because vehicle was out of warranty. Repairs not completed for most complainants.
Recalls/TSBs owners mention: One owner mentioned learning of a lawsuit regarding the failure; manufacturer design defect suspected but no recall or TSB cited in narratives.
Rear Windshield Degradation and Reduced Visibility
Rear windshield develops cloudiness or haze, obscuring visibility both from outside looking in and inside looking out. Condition worsens at night, reducing driver's ability to see traffic and obstacles behind vehicle. Owner reports windshield was present when vehicle purchased new; no accident history.
When: Over several years of ownership; complaint filed at approximately 80,000+ miles based on ownership timeline
Symptoms owners cite: Rear windshield becomes increasingly blurry or cloudy; Visibility impairment worse in low light/night driving; Haze visible from both exterior and interior perspectives
Repairs/costs cited: No repairs attempted. Kia dealers claim windshield not warranted and stated they are not aware of the problem.
Recalls/TSBs owners mention: Dealers deny warranty coverage and claim no awareness of the issue despite customer reports to multiple Kia dealerships.
Headlight On-and-Off Blinking and Dropout
Daytime running lights or headlights blink on and off intermittently and cut out entirely, making night driving unsafe. Failure pattern cannot be replicated by dealer diagnostics, complicating diagnosis.
When: Approximately 90,000 miles
Symptoms owners cite: Daytime running light blinks on and off; Headlights turn off without input; Unable to drive vehicle safely at night
Repairs/costs cited: Dealer unable to replicate or diagnose failure; no repair completed.
Recalls/TSBs owners mention: Manufacturer instructed owner to return to dealer but provided no assistance or additional troubleshooting guidance.
Synthesized from 22 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had visibility 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 visibility problem on the 2016 Kia Optima?
It's a documented issue but not catastrophic. 22 complaints have been filed. Repairs average $350 and most owners catch it before it causes a breakdown.
At what mileage does the visibility typically fail?
Across the 15 complaints that reported odometer mileage, most visibility failures cluster between 48,000 and 90,000 miles, with the median around 69,600. A quarter of owners report trouble before 48,000; a quarter make it past 90,000. 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 $350 for visibility 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 visibility?
No active recalls currently cover visibility 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.