2019 Toyota Highlander

My 2019 Highlander was driving totally normal, when all of a sudden the transmission started slipping and then would no longer accelerate. I was on a windy back road in Alaska with no service, so after letting it sit for a bit I tried to drive it again. It then drove maybe 1/2 more miles before slipping completely and no longer accelerating. No check engine lights came up. I got it towed to my house where a mechanic took a quick scan and said there was a number of transmission codes popping up.

The transmission (power train) in this vehicle shows symptoms of a known defect in Toyota's UA80 8-speed. Since approximately (Aug 2026/~70k mileage), it has produced shining/grinding noised at increasing speed. these symptoms match failure patterns described in Toyota's own Tech Service Bulletin for transmission, which have led to documented cases of sudden power loss, gear slippage, and complete failure in other owners of this and related models. I have not yet experienced complete loss of propulsion, but given the documented failure patterns, there is a foreseeable risk this could occur without warning while driving, including traffic or while merging, creating a safety hazard. I took the vehicle to Toyota of Manchester, NH dealership on [XXX] and requested repair given the known TSB coverage. Toyota denied repair assistance, citing lack of dealer service records, despite transmission fluid being a lifetime-fill component unrelated to this failure mode. I am filing this proactively due to the documented risk of sudden failure, and because Toyota denied to address a known, symptomatic defect before it progresses and declined to take responsibility for the repairs or repair assistance for this defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The UA80 8-speed automatic transmission failed at 87,896 miles. Symptoms began as slipping in 1st and 2nd gears and harsh jerking when accelerating from a stop, with the engine revving while the vehicle failed to move. This is a loss of motive power that can occur without warning in traffic. On 8/31/2026 a Toyota dealer diagnosed a failed transaxle requiring complete replacement, with a whine traced to the differential inside the transmission, and quoted $11,126.81. This matches the failure mode in Toyota TSB T-SB-0160-18, which Toyota addressed for some 2017-2018 VINs under Customer Support Program ZJC. My 2019 has the same UA80 unit but falls outside that program. The replacement part is backordered with no ETA per Toyota's own case portal. The vehicle is maintained on schedule and available for inspection. Toyota declined goodwill assistance and refused to provide the denial in writing.

The component that malfunctioned is the vehicle’s automatic transmission. The transmission developed a progressively worsening humming/whining noise during acceleration. The transmission is no longer available for inspection because the vehicle has been taken to an independent transmission repair shop for diagnosis and repair. The problem creates a safety concern because the transmission developed significant internal wear or damage and could potentially worsen or fail while the vehicle is being driven. A transmission failure could result in loss of power or unexpected changes in vehicle operation, increasing the risk of an accident, particularly while accelerating or merging into traffic. The problem was reproduced and confirmed by a Toyota dealership. The dealership diagnosed the noise as coming from the transmission and determined that the transmission requires replacement. The dealership recommended replacing the transmission rather than repairing the specific internal component causing the noise. The vehicle was inspected by the Toyota dealership. It is now at an independent transmission repair shop for repair. No police or insurance inspection was involved. There were no warning lights or warning messages on the dashboard before the problem. The first symptom was an unusual whining noise from the transmission area. The noise later changed into a more noticeable humming sound that increases with acceleration and vehicle speed. The vehicle continued to operate, but the abnormal transmission noise persisted and progressively became more concerning.

My 2019 Toyota Highlander AWD vehicle started making a whining noise around 85,000 miles. This high pitched whining sound occurred while accelerating and became louder and louder with time. I researched the issue and found out that the same issue had occurred on 2018 Highlanders and Toyota issued a Customer Service Bulletin T-SB-0160-18, which addressed the repair and replacement of these UA80 transmissions regardless if the warranty had expired or not. After visiting my local Toyota dealer, they confirmed that the high pitch whine was the final drive noise with the UA80 transmission and the exact same issue as the 2018 Highlander. If left unchecked, my transmission would eventually fail. Since my 2019 Highlander is not part of any recall, and at the moment, not part of the Customer Service Bulletin T-SB-0160-18, I was left to take care of the repair on my own. I contacted Toyota Corporate and requested financial assistance on the the approximate $7,000 charge to replace my transmission. Toyota told me that my car was not under warranty, but they could pay for my 50% of my cost to replace my transmission. I had to pay $3,535 (half of the total cost) to repair my transmission. Since this issue is a manufactured flaw with the assembly of the transmission, I believe the entire repair should be covered 100% by Toyota; therefore, a recall should be issued or the 2019 Highlanders should also be included in the Customer Service Bulletin T-SB-0160-18.

My 2019 Toyota Highlander has the same UA80 transmission that Toyota was required to fix under CUSTOMER SUPPORT PROGRAM ZJC, which covers 2017-2018, the transmission has the same whining noise and shifting issues. Toyota must accept responsibility for their manufacturing error where the washer tab was not bent properly, allowing a nut to loosen leading to the whining noise. I expect the NHTS to require them to cover their 2019's as well, as a consumer we are getting screwed here.

In April of 2026 started hearing a whining noise in the engine of my 2019 Toyota Highlander. The vehicle has 110471 miles. Have had it checked at the dealership twice and a mechanic twice. All have said the transmission is going out. I have had the transmission fluid replaced, but it did not help. Apparently, Toyota knew about this problem and still sold the car. I am unable to drive car because I am afraid it is going to break down. The dealership said they could replace the transmission for 8762.64 dollars. Toyota has since stopped making UA80 eight speed auto transmission.

I have a 2019 Highlander XLE AWD that had 85000 miles when the transmission started whining. It got worse pretty quickly so iI took it to a transmission shop. They rebuilt it for $6700.00. I drove it for another 9-10 thousand miles and the whine is back. I'm not sinking another $6700.00 into another transmission. I've talked to several transmission shops and I'm being told there isn't a true fix. Rebuild it and it will come back, guaranteed. What recourse do I have? The car only has 102,000 miles which is typically nothing for a Toyota. But it all started at 85000. Something needs to be done. I see programs for the 2017 and 2018 models but not the 2019. It's the same transmission. The issues crop up after the vehicle has gone out of warranty.