What 473 owners told NHTSA about the 2021 Toyota Highlander

Premature AC refrigerant leak and failure in system in the 2021 Toyota Highlander due to corroded/defective rear AC lines located near the exhaust/spare tire, observed at very low mileage and upon official inspection at the nearest Toyota dealership. Noticed early in ownership and decided to have the vehicle scanned when air being released only continued to grow warmer in the sweltering summer months. Reporting due to advice from friends and owners in my exact situation with the very same issue as well as the pricey three-thousand dollars and upwards quote to have this work done from Curry Toyota, 3026 E Main St, Cortlandt, NY 10567. Vehicle purchased new to avoid these very issues.

NHTSA ODI 11664841

This is a supplemental complaint to add more detail to a prior submission. I am the original owner of a 2021 Toyota Highlander with 10,000 miles at the time of the issue worsening to the point that I finally broke down and was forced to pay the Toyota dealership's hefty diagnostic fee. The air conditioning system has failed due to a refrigerant leak in the rear A/C lines, specifically near the exhaust area under the vehicle. The dealership diagnosed the issue and quoted me over $3,000 to replace “all necessary components in the rear.” They offered no coverage or goodwill repair despite the vehicle’s age and mileage. Upon researching the issue for longer than a year at this point, I discovered far too many similar complaints from other Highlander owners (years 2019–2021) describing identical failures — typically rear A/C lines corroding, cracking, or leaking prematurely. In some cases, customers were told Toyota is aware of the issue but not issuing a TSB or recall. In other cases, dealers said no permanent fix exists. These repairs are prohibitively expensive and, in some reports, recurring due to poor line placement or dissimilar metal corrosion near heat sources. This significantly impacts safety in several ways: Impaired Visibility: The AC system is integral to effective defogging and defrosting of the windshield, especially in humid or cold conditions. Without it, visibility is severely compromised, increasing the risk of an accident. Driver Impairment: In extreme temperatures, lack of climate control can lead to driver fatigue, distraction, and reduced concentration, posing an indirect safety risk. I am reporting it to request NHTSA monitor the trend. This seems to reflect a possible engineering or design flaw, and the number of similar owner reports suggests it may warrant further review by Toyota and NHTSA. Customers should not be facing multi-thousand-dollar repairs on near-new vehicles with basic systems failing. Thank you for tracking this issue.

NHTSA ODI 11664890

Windshield side beveled trim driver’s side snapped and flew off on the highway into oncoming traffic and the passenger side is also loss and almost coming off.

NHTSA ODI 11654176

The contact owns a 2021 Toyota Highlander. The contact stated that while operating the vehicle, the display screen malfunctioned and displayed a solid black screen. During the failure, several functions and features could not be accessed or activated, including the front and rear defrosters. The contact was unable to clear the front and rear windshields, which created a visibility hazard for the driver. The vehicle was taken to the local dealer, who diagnosed that the display screen unit needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 45,000.

NHTSA ODI 11649388

The contact owns a 2021 Toyota Highlander. The contact stated while driving at 55 MPH, the driver’s side mirror was vibrating abnormally. There were no warning lights illuminated. The vehicle was taken to a dealer and the vehicle was diagnosed and it was determined that the screw securing the mirror had loosened. The vehicle was repaired; however, the failure persisted. The manufacturer was not made aware of the failure. The failure mileage was approximately 38,000.

NHTSA ODI 11647068

I just bought this 2021 Highlander XSE & the drivers side mirror vibrates above 30mph. I feel this makes it very hard to see properly especially on the interstate traveling 70mph & trying to get a clear view of the roadway & cars around me. I took the car to my local Toyota dealer & was told this is a common problem among the new design with the Highlander’s. I do not feel safe not being able to see properly.

NHTSA ODI 11614133

Vehicle windshield glass has a distorted and wavy quality that impacts visibility for the driver. I have contacted the dealership about this issue and there is not a current recall for the windshield. The windshield says Toyota Pilkington laminated acoustic heated [XXX] , DOT15. I purchased this vehicle in the last week and did not notice the distortion on the short test drive. At first, I thought it was a reflection issue from the dash, but it is not. This should be investigated and remedied. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11546874

We purchased 2021 highlander in March 2021. Since the day we experienced some vibration in the driver side mirror and we first notice bad vibrations when we drove above 40 to 50 mph. We never bought this up with Toyota or the dealer untill May 5th 2023. When we created a case with Toyota, they directed us to the dealer. Once we scheduled the service they confirmed the vibration and replaced Part Number: 879400E351. After the replacement we noticed that the vibrations are getting bad even during lower speeds now. The mirror is vibrating during idle and any speed higher than 30/ 40mph. We scheduled another appointment with the dealer and the manager did test drive another highlander 2022 model and confirmed that it is also vibrating. It was surprising to see that all the highlanders have these mirror vibrations. They said eventhough theres is vibration, it'd be considered normal. I rive mostly during night. The driver side mirror is blurry, vibrating and is extremly difficult to drive the car and is scary that the image on the mirror is not steady and create confusions to the driver. Changing lanes or entering to highway is really challenging as the mirros are vibrating too much and extremely hard to concentrate. This may even can cause major accidents as the image is not clear. The vibrations (humps, dips, rumble strips) are even translated to driver side vibrations and is very hard to see. The dealer even agreed to it but said that it’s a Toyota flaw in design because all Highlanders have this… and after talking to them, they said the only way Toyota would even look at this issue or have an engineer take a look in to it is if they get enough complaints or see a pattern. This is why I am reporting this to NHTSA. I want to keep Americans road safe and sound to all my fellow humans. They also said Toyota RAV4 also had these issue and Toyota issued a TSB however there is nothing on Highlander. I humbly request NHTSA to seriously look in to this and assist us.

NHTSA ODI 11523053

The driver side mirror wiggles at highway speed or with strong wind and the image in the mirror is not clear which causes the driver to do a double take on where and how far the car is. This is a safety issue that needs to be addressed and fixed by Toyota. I’m not the only one experiencing this issue, see other reports. Thanks for your quick action on this matter.

NHTSA ODI 11522023

While driving my 2021 highlander on the road my Driver side mirror shakes alot. It makes my visibility shaky when im trying to switch lanes. I took the car to toyota and newer models are having same issue the toyota dealer told me

NHTSA ODI 11514374

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 messages present.

NHTSA ODI 11498163

The contact owned a 2021 Toyota Highlander. The contact stated while driving approximately 50 MPH with a passenger in the rear passenger seat, she heard an abnormal popping sound and the sunroof exploded from the inside-out without warning or impact. The shattered pieces of glass were propelled outside the vehicle. The occupant in the rear passenger seat sustained a cut on the finger but did not seek medical assistance. The vehicle was taken to the local dealer where it was diagnosed that the sunroof glass panel needed to be replaced and it was confirmed that the failure was not due to an impact to the sunroof. The vehicle was repaired. The manufacturer was not notified of the failure. The contact stated that she was concerned about a potential reoccurrence of the failure. As a result, she traded the vehicle. The failure mileage was approximately 7,500.

NHTSA ODI 11489082

Driver side mirror vibrates and gets worse on the interstate and windy days. It does not give clear, steady view. Night time all you see is shaking headlights. It’s highly distracting and discomforting to eyes and causes headaches. Taken it to dealership plenty of times. It was replaced one time and still same issue. Dealership contacted Toyota about the issue and still no solution.

NHTSA ODI 11488021

The contact owns a 2021 Toyota Highlander. The contact stated that while his wife was driving at 65 MPH, she heard a loud abnormally horrific sound coming from the roof of the vehicle. The contact's wife immediately pulled over and upon inspection, she discovered that the sunroof had shattered without incident. The contact's wife drove the vehicle to the dealer and the vehicle was left in their possession. Days later, the dealer informed the contact that it appeared to be previous damage to the sunroof had caused the failure and that the damage would not be covered under warranty. The manufacturer was not notified of the failure. The vehicle has been repaired. The failure mileage was approximately 19,000.

NHTSA ODI 11441746

Since purchasing this 2021 Highlander Platinum in July 2021, the glass of the side mirrors are always 'shaky' at speeds above 40mph. The dealer has replaced the glass, which did not improve the issue. They then replaced the entire mirror assembly, which still has not fixed the issue. The mirror is shaky/jittery enough to make it difficult to look into while driving prior to changing lanes.

NHTSA ODI 11428182

THERE IS DEFECT IN THE TOYOTA HIGHLANDER PLATINUMS' DRIVER SIDE MIRROR. THE MIRROR GLASS WILL VIBRATE LEFT AND RIGHT WHEN DRIVING. IT DISTORTS THE IMAGE IN THE MIRROR. WHEN ON HIGHWAY, IT IS VERY NOTICEABLE. THIS KIND OF VIBRATION SHOULD ONLY OCCUR IF YOU DRIVE OVER THOSE POTHOLES OR RIPPLE ON THE YELLOW DOUBLE SOLID LINES OR SHOULDER OF ROAD. I HAVE TEST DRIVEN MULTIPLE ONES OF THE SAME TRIM ON THE DEALERSHIP'S LOT TO TRY TO GET DEALERSHIP TO LOOK INTO REPLACING/FIXING MY MIRROR, BUT THEY ARE SAYING ITS A CHARACTERISTIC OF THE VEHICLE SINCE THE OTHERS ARE DOING IT. ALSO TEST DROVE A LIMITED TRIM AND THE VIBRATION WAS WORST THAN THE PLATINUM. I HAVE NOT HAD THIS ISSUE WITH OTHER 4 WHEEL CARS. TOYOTA WILL NOT ADDRESS THIS ISSUE JUST BASED ON MY COMPLAINT SO I AM PUTTING THIS COMPLAINT SO HOPEFULLY TOYOTA WILL ADDRESS THE ISSUE.

NHTSA ODI 11416722