TSB: The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. Follow the procedures outlined in this service bulletin to aid in locating, inspecting, and repairing refrigerant leaks
full bulletin at NHTSA ↗2021 Toyota Highlander visibility problems
severe Owners of the 2021 Toyota Highlander have filed 13 NHTSA complaints about the visibility at roughly $350 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See visibility across all vehicles →
Complaints
13
Recalls
0
Avg fix
$350
| Model year | visibility complaints |
|---|---|
| 2017 Highlander | 15 |
| 2018 Highlander | 5 |
| 2019 Highlander | 5 |
| 2020 Highlander | 5 |
| 2021 Highlander (this page) | 13 |
| 2022 Highlander | 14 |
| 2023 Highlander | 4 |
1injury
What stands out
No new NHTSA visibility complaint has been filed on this vehicle in over 3 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 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.
TSB: Some 2020 ? 2022 model year Highlander and RAV4 vehicles, and 2022 model year Tundra vehicles equipped with a start/stop switch may exhibit water entry to the vehicle from the HVAC drain hose being disconnected from the air conditioning radiator assembly and/or a grease/oil odor emitting from the vents. This condition may be caused by paraffin wax leaking from the evaporator. Follow the repair procedure in this bulletin to address this condition.
full bulletin at NHTSA ↗TSB: Some 2020 ? 2022 model year Highlander and RAV4 vehicles, and 2022 model year Tundra vehicles equipped with a start/stop switch may exhibit water entry to the vehicle from the HVAC drain hose being disconnected from the air conditioning radiator assembly and/or a grease/oil odor emitting from the vents. This condition may be caused by paraffin wax leaking from the evaporator.
full bulletin at NHTSA ↗TSB: Some 2018 model year Camry and Camry Hybrid, 2019 model year Avalon and Avalon Hybrid, 2020 ? 2021 model year Highlander, Highlander Hybrid, and Corolla, and 2021 model year Sienna Hybrid vehicles may exhibit decreased front windshield defroster performance at extremely low ambient temperatures. This condition may be the result of the fresh/recirculation servo actuator separating from the servo. This condition does not affect the airflow of the defroster. Follow the Repair Procedure in this bulletin to address this condition.
full bulletin at NHTSA ↗TT: When used in conjunction with the Repair Manual, these Blind Spot Monitor, Forward Recognition Camera, and Front Millimeter Wave Radar tips leverage SSTs and readily available tools to support target placement in varying shop environments.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report five distinct visibility issues in the 2021 Highlander. The sunroof glass has shattered spontaneously without warning or impact at mileages as low as 7,500 miles, with one incident injuring a rear passenger and another occurring at 19,000 miles—dealer diagnostics ruled out external impact.
Driver-side mirror vibration dominates the complaint set. Multiple owners report the mirror glass shakes and vibrates at speeds above 30–40 MPH, distorting the image and making lane changes risky, particularly on the interstate or in wind. Owners tested multiple new units on dealership lots and found the issue widespread across Platinum and Limited trims. Dealers have acknowledged this as a design characteristic of the new generation. Repair attempts—tightening mounting screws, replacing mirror glass alone, and replacing the entire assembly—have all failed to resolve the issue. One owner reports a lengthy troubleshooting history with dealership and Toyota, with no solution offered.
A separate windshield distortion issue affects visibility, with one owner reporting a wavy quality to the glass unrelated to dashboard reflections. An infotainment display screen malfunction at 45,000 miles rendered defrosters inoperable, blocking windshield clearing. Another owner reports defroster failure causing interior fogging and icing regardless of climate settings, forcing manual window clearing to maintain safe visibility.
Same Toyota Highlander visibility reports on nearby years: 2022
Failure modes owners describe
Sunroof spontaneous glass failure/shattering
Sunroof glass panel shatters without warning or external impact, with glass propelled outward from vehicle. Dealer diagnostics confirmed no impact damage was present.
When: 7,500 miles (Complaint #1); 19,000 miles (Complaint #3)
Symptoms owners cite: Loud popping or abnormally horrific sound from roof; Spontaneous glass breakage without impact; Shattered glass pieces propelled outside vehicle
Repairs/costs cited: Sunroof glass panel replacement
Driver side mirror vibration/shaking
Mirror glass vibrates and shakes at highway speeds (above 30–40 MPH), distorting the image and creating visibility hazard. Affects multiple units across Platinum and Limited trims. Dealers report this as a design characteristic of the new generation. Multiple repair attempts (glass replacement, mirror assembly replacement) have failed to resolve the issue.
When: Present across various mileages; noted early in ownership and persisting (38,000 miles noted in #7); occurs consistently at highway speeds
Symptoms owners cite: Mirror glass vibrates/shakes at speeds above 30–40 MPH; Distorted, blurry, or jittery image in mirror; Worse on highway or windy conditions; Night vision distorted by vibrating headlights; Difficulty obtaining clear line of sight when changing lanes
Repairs/costs cited: Loosened mounting screw tightened (temporary, did not resolve); mirror glass replaced (ineffective); mirror assembly replaced (ineffective)
Recalls/TSBs owners mention: Dealership reports issue is a characteristic of the new design; Toyota contacted by dealership with no solution offered
Windshield distortion
Windshield glass exhibits wavy or distorted quality that impacts driver visibility. Owner reports it is not a reflection issue from the dashboard but inherent to the glass itself.
When: Observed shortly after purchase; new vehicle
Symptoms owners cite: Wavy distorted quality in windshield glass; Impacts driver visibility
Recalls/TSBs owners mention: No current recall for this windshield issue
Display screen malfunction (black screen)
Infotainment display screen goes completely black, rendering multiple climate and visibility functions inaccessible, including defrosters.
When: 45,000 miles
Symptoms owners cite: Solid black display screen; Front and rear defroster functions inoperable; Unable to clear windshields, creating visibility hazard
Repairs/costs cited: Display screen unit replacement needed
Recalls/TSBs owners mention: Manufacturer notified; no assistance offered
Window defrost/defogger malfunction
Interior window defroster or defogger fails to function properly, leaving windows fogged or iced regardless of heating settings applied.
When: Not specified
Symptoms owners cite: Interior windows fog up and ice over; No defroster/defogger operation regardless of settings; Visibility compromised in side windows and rear-view mirror
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Visibility for interior windows defroster/defogger is not functioning. Inside windows are fogging up and icing no matter what heating setting is used. This poses significant risk of visibility in all windows. I have had to try to defrost the inside of my windows just to see out of my side windows and see in my rearview mirror. I have not gone to the dealership, but do intent to. No warning…
Had visibility trouble with your 2021 Toyota Highlander?
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 2021 Toyota Highlander?
It's a meaningful issue. 13 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $350.
At what mileage does the visibility typically fail?
Based on the 13 complaints filed, visibility issues most often appear around 27,375 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 $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/2021/Toyota/Highlander.
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.