2017 Toyota Highlander

Vehicle is a 2017 Toyota Highlander (VIN [XXX]) experiencing the UA80 8-speed transmission whine defect (T-SB-0160-18) upon acceleration. An authorized Toyota dealership test drove and officially verified the transmission failure and recommended a full replacement. However, Toyota Corporate is refusing to honor the ZJC Customer Support Program warranty extension due to an arbitrary VIN cutoff. The failing internal transmission components pose a safety risk as they can lead to harsh shifting, slipping, or a sudden loss of motive power while driving in traffic. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

bought the car in 2018 and ever since it makes a rttling noise, Toyota says it is the hybrid system engaigeing, hybrid cars are not supposed to make noise.

Vehicle had history of hard shifting from 1st drive. On January 24, 2026 we heard a ringing sound as we were driving. Approximately 10 minutes after the noise began, the Check Engine light illuminated. We drove back home and connected our code reader to find P0741, P2714 and P2757. Had the vehicle towed to my Toyota Service Center and upon inspection, was informed that the transmission had failed and would require replacement. I was informed that although it was a 2017 with the UA80E manufacturered in April 2017 - it did not qualify for free replacement under Toyota. A rebuilt unit was secured and installed on 2/11/26. Toyota authorized $2000 Goodwill Assistance and their Warranty Labor Rate. I paid the remainder of the bill. The 'new' transmission also shifts hard and just doesn't feel like it it working right.

The contact owns a 2017 Toyota Highlander. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, who determined that the spark plugs needed replaced. The spark plugs were replaced by an independent mechanic, but the failure recurred. The vehicle was taken back to the independent mechanic, who retrieved diagnostic trouble codes P11F0 (Air-Fuel Ratio Imbalance) and P0305 (Misfire In Cylinder Number 5). The mechanic cleaned the fuel injectors, but the failure persisted. The contact was informed that the fuel injectors needed to be replaced. The vehicle was taken to a second dealer, Toyota of Cedar Park (5600 183A Toll Rd, Leander, TX 78641), who determined that cylinder #5 needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 151,000.

At 119500 miles a eev whining noise started. Only had all repairs done at a dealership.

There is a known issue with the transmission in my 2017 Toyota Highlander that causes premature failure. This is noted in a Toyota Customer Support Program Bulletin. The issues symptoms are the same as those my car has: a whining noise from the transmission while driving, harsh shifting, reduced power, and master warning light/check engine light illumination. I have contacted Toyota and explained this to them, but they have told me that my car's VIN number does not match the identified vehicles. I am reaching out as I believe there are vehicles with this problem that Toyota has not identified, and it could be a dangerous issue.

DESCRIPTION OF DEFECT: My 2017 Toyota Highlander experienced a complete transmission failure under normal driving conditions. The vehicle began showing symptoms including delayed shifting, hesitation when accelerating, and eventual loss of proper drivability. The issue was diagnosed by an authorized Toyota dealership, which confirmed internal transmission failure. The estimated repair cost provided by the dealer was approximately $9,000. I opened a case with Toyota Customer Experience and submitted an escalation request, but no assistance was provided and the claim was declined or ignored. MY CAR HAD A HISTORY OF REGULAR MAINTENACE DONE BY A CERTIFIED TOYOTA DEALERS My case # :XXX Due to the urgency of transportation needs and lack of manufacturer support, I have been forced to proceed with an independent transmission replacement. Which will cost me anywhere between $6,000 and $7,500 This failure occurred without warning severe enough to prevent continued safe use of the vehicle and raises serious safety concerns regarding sudden loss of power and drivability. SAFETY IMPACT: The transmission failure caused unsafe driving conditions including hesitation during acceleration and potential loss of power while in traffic, which could increase risk of collision. ADDITIONAL INFORMATION: VIN: [XXX] Mileage at failure: 168000 Dealer diagnosis confirmed transmission failure Manufacturer case opened and escalated with no resolution I am submitting this complaint to document a potential systemic defect and to support ongoing safety investigation and consumer protection review. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The transmission is whining when i coast. I fear the transmission might be dying.

In January during an oil change i was advised that my Toyota had a timing cover leak which is a costly repair. At this time my car was at 148k. i researched it recently and found that it could be dangerous to drive with this leak that Toyota did not advise me about after i had several phone calls with their corporate office and dealership. And even though it is a common problem with their 2017 Highlander they would not take responsibility for fixing it. It was disappointing after getting all of the service recommendations done that i would have to pay $4500.00 for engine work for a seven year old vehicle. This cost was a hardship for me because I'm still making a car payment. I also had to replace the battery every 1.5 years. The battery warning light never came on, leaving me stuck at an intersection until the tow truck arrived. It cut off because of the start/ stop feature and that would not start again. No warning. And after about 15 minutes my hazard lights went dead. This is an ongoing issue.

On April 5, 2026, my 2017 Toyota Highlander was involved in a side‑impact (T‑bone) collision on the front & rear passenger side. I was seated in the front passenger seat. The impact was hard enough that my insurance company declared the vehicle a total loss. During the crash, I struck my head, but no airbags deployed (front, side, or curtain). The vehicle is being released to Liberty Mutual Insurance. There were no warning lamps, messages or other symptoms of the problem prior to the failure. I am concerned that the airbag/SRS system may not have functioned properly in a crash severe enough to total the vehicle and cause a head injury to a front passenger. I am requesting that NHTSA record this incident and consider whether there may be a safety defect related to side or curtain airbag non‑deployment in this vehicle. Crash date: April 5, 2026 Approximate speed of other vehicle: [unknown] Location of impact: front passenger side (T‑bone) Result: vehicle declared total loss, head injury to front passenger, no airbag deployment.

The radar cruise control system on my 2017 Toyota Highlander is not functioning properly and creates a safety hazard. When initially setting the radar cruise control, the system works as expected. I can accelerate to a desired speed, press the “set” control, and the vehicle maintains that speed correctly. The problem occurs when I try to increase the set speed. After setting an initial speed (for example, 45 mph), I accelerate to a higher speed (such as 65 mph) and press the “set” control again to update the cruise setting. Instead of setting the new speed, the system reverts to the previously stored speed. When this happens, the vehicle rapidly decelerates and applies braking to return to the lower speed. This sudden and unexpected braking creates a dangerous situation, especially on highways, as it can put surrounding drivers at risk of a rear-end collision. I have tested this multiple times and experience the same result each time. This issue only occurs when using radar cruise control and does not occur with standard cruise control. note this has been an ongoing issue since the day I purchased my vehicle in January 2017. I notified the dealership about the issue and they stated they would open a case with Toyota

Power training went out I-70 in warren county mo where all the construction is. It put my 4 autistic kids in danger. No insurance looked at the vehicle. However a mechanic did look and diagnosed it which look over a week for. Kaizen auto in wentzville mo diagnosed it

The component that has been deemed in need of replacement is the UA80 8-speed transmission. It is available for inspection as of today's date, April 1, 2026. My and my family's safety has been put at risk of the transmission failing, especially at highway speeds. The problem was reproduced and diagnosed at both a local repair garage in Westwood, MA and the Nucar Toyota dealership in Norwood, MA. Both facilities inspected the transmission, heard a high-pitched whining noise, and determined it was irreparable and needs to be replaced. This high-pitched whining noise is a known and well-documented problem with these transmissions and needs to be included in a widespread manufacturer's recall.

Purchased a brand new 2017 Toyota Highlander XLE 9 years ago. I followed all recommended maintenance and service schedules from the manufacturer. There has always been a faint whine noise present during acceleration. In December of 2023 and about 112,000 miles the transmission began to slip in gears 3 and 4. I brought the vehicle into Balise Toyota in West Springfield, MA for diagnostic services. It was determined that my automatic transmission was failing and needed replacement. Luckily I had purchased an extended warranty through All State and the repairs were covered under warranty. The cost of this repair was upwards of $9,000, so at the time I felt extremely fortunate. That was 2 years ago but my luck would only last so much. Since the remanufacturered transmission was installed by Toyota there has always been a faint whine noise during acceleration. I summed it up to a bad serpentine belt, pulley or alternator because how could it be the new transmission that had been installed? There is only 37,000 driven miles on it and you would expect it to last much longer. Well expectations are just that, expectations. The reality is I am now back to square one because my transmission is beginning to fail yet again. I experienced the transmission slip between 3rd and 4th gears twice on my way home from work yesterday. I set up an appointment at Balise Toyota in West Springfield, MA for tomorrow 03-29-26. My question is how can an 8 1/2 year old vehicle with 150,000 miles on it be in need of a third transmission? The answer is because of defective manufacturing and engineering. There are several class action lawsuits that have been filed in as many months due to the UA80 transmission found in Toyota Highlanders 2017 - present. There are documented claims that Toyota knowingly installed defective UA80 transmissions into these vehicles.

March 5th purchased a battery from Autozone Z net Fit Match that caused cascading electrical and life -safety risk while traveling from hewitt, TX to Washington DC for our families spring break trip including 4 minor children. Component: 12-Volt Battery / Electrical System / Power Steering / Service Brakes Summary: Vehicle suffered catastrophic failure of Power Steering and Braking systems while in motion due to the installation of an incompatible lead-acid battery recommended by AutoZone’s 'Z-Net' catalog. Despite Toyota Technical Service Bulletin T-TT-0523-19 (Jan 2019) stating this VIN requires an Enhanced Flooded Battery (EFB/AGM) for its Stop-Start system, the retailer’s database continues to misidentify standard batteries as compatible. This mismatch causes a voltage drop that disables critical safety modules ('Limp Mode'). I have video evidence of the catalog error. This is a systemic misrepresentation affecting 2017+ Toyota Highlander safety compliance.

My husband and I were driving down the highway when the front part of our sun roof shattered.

Transmission failed in May 2025, around 95,000 miles. Had to have entire transmission replaced. Shop said metal filings were found in the fluids, leading to the breakdown and need for full replacement. No other warning lights or lamps indicated a problem. A high pitched whining noise was the indicator, which then led to several visits to the shop, monitored the issue, changed fluids, but the transmission eventually failed. Transmission failed in May of 2025, it took 3 months for a new transmission to be built and shipped to the midwest for install in Aug 2025.

Transmission yes it’s available for inspection rite now on vacation on a very steep hill the transmission quit pulling at the top of the hill in the middle of a very narrow street and we had to ease backwards down to a place on the hill to turn around and get to level ground all this happened with no previous warning

Purchased my 2017 Highlander in June of 2017. At 4912 miles noticed the transmission was slipping. Contacted the dealership and was told from an employee that in his 20 plus years he had never had a transmission do that. Took it to the dealership and it was the transmission. It was replaced under warranty. In January of 2026 took it to the dealership after noticing a weird whinnying sound when running. After running a diagnostic test I was informed that my transmission needed replaced again. It only has 72,426 miles. Was told that the transmission was on back order and when asked if safe to drive, told yes.

The contact owns a 2017 Toyota Highlander. The contact stated that when the vehicle was taken to a dealer for routine maintenance, the dealer informed the contact that the rear main seal was leaking and needed to be resealed. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 95,402.