2017 Toyota Highlander: transmission slipping

Filed Oct 3, 2026 · Transmission · PA

Our Toyota Highlander XLE which has 137000 miles on it has the very well documented "whine" issue with the UA80 transmission. This "whine" issue/failure has resulted in at least two TSB's to be generated by Toyota and is considered the beginning stages of a total transmission failure. It impacts 2017 through at least 2022.The symptoms (whine sound/grinding sound/DTC codes/rough operation/unexpected slippage) are identical in all years. Toyota covered a small subset of the total number of failures suggesting an improperly installed "washer" was at fault. The online community impacted by this failure, most of which are outside of that serial number range, clearly do not feel the same way. Failures have occurred on vehicles with as little as 50,000 miles. The issues of transmission slippage/failure to maintain speed/failure accelerate are all safety risks. This problem has been confirmed MANY times by Toyota and it's network of dealers. I had my own vehicle inspected (at my expense) by a local Toyota dealer and they confirmed the failure. In my particular case, the "whine" sound is the only initial symptom with the expectation of other symptoms and issues if I continue to drive the vehicle.

Filed Jul 8, 2026 · Transmission · PA

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)

Filed Mar 29, 2026 · Transmission · MA

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.

Filed Jan 15, 2026 · Transmission · OK

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.

Filed Oct 20, 2025 · Transmission · MA

Transmission when the car first starts up is slipping. No dipstick for checking Transmission fluid.

Filed Jun 24, 2025 · Transmission · FL

Car suddenly began to slip out of gear and have difficulty shifting smoothly. After having car examined by 2 repair shops it was determined the UA80 Transmission needed replaced. Repair shop advised car was not safe to drive with this condition. Warning lights for Check Engine and Check AWD system and traction control came on at the same time as the slipping and rough shifting.

Filed Jul 21, 2023 · Transmission · OH

Several times on the highway when getting up to speeds around 70mph the transmission would rev but not accelerate or maintain speed - usually slowing to around 40-50mph or slower depending on the hill grade. The check engine light came on, initially was told it was probably a fluke. The mechanic couldn’t get it to do the same thing for him. Brought it back again when the issue persisted. He suspected the transmission was slipping, referred me to the dealer. The light was off by then, the dealer said they couldn’t diagnose with no light so we needed to wait until it came on. It finally came on while driving on I71 but the car completely lost all power and I was stranded on the side of the highway and had to be towed to the dealer. I did a quick google search and saw a class action suit for this vehicle and year in which the plaintiffs complained of the same issues. Toyota opened an extended warranty on vehicles with this transmission. I called Toyota to see if my VIN was included and they confirmed it is. The person I spoke with (“Cannon”) assigned case # 20612000768. Per the dealer, my vehicle only met half of the criteria to be included under the program. We were stuck with a $6,149 bill to replace the transmission. The dealer won’t even guarantee it for 30 days because it’s a used Toyota transmission, which to me speaks volumes.

Filed Jan 19, 2021 · Transmission · 44,000 miles · CO

On highway traffic came to a complete stop we sat with foot on brake maybe 2-3 minutes when I released brakes car would not go for a second then started going, no noises that I recall. 2nd time after I turn and start to speed up it feels like its slipping or really sluggish, this has now happened a few times, it seems to be when I first drive the car in the morning. Have not noticed it as much after it warms up and I drive for a while. I have 44,000 miles currently and did buy it new.