2018 Toyota Highlander: complete transmission failure

Filed Nov 3, 2026 · Transmission · IL

The transmission started whining over the summer and has been gradually getting worse. I took it in and was told it needed a new transmission. The vehicle just has 72,000 miles on it and the whine started around 67,000 miles. From my research, this appears to be a known issue with Toyota. If the transmission goes out while I’m driving I could lose control of the vehicle and/or become a hazard, and put my life at risk as well as others on the road.

Filed Oct 30, 2026 · Transmission · UT

My 2018 Toyota Highlander AWD (75,000 miles) was diagnosed with internal transmission failure on its UA80F 8-speed automatic transmission. The diagnosis confirmed fluid shear and internal metal wear requiring a $9,000+ replacement. The UA80 series is subject to Toyota TSB T-SB-0160-18 and Customer Support Program ZJC for factory assembly flaws involving retaining hardware and bearing wear. Toyota denied goodwill coverage because my VIN falls outside their narrow ZJC date window. Component Failed & Inspection Availability: UA80F 8-speed automatic transmission assembly (powertrain). The vehicle and transmission are intact and available for the federal safety agency or manufacturer inspection upon request. Safety Risk: Premature internal mechanical failure of the UA80F transaxle presents a severe highway safety risk. Gear wear, fluid shear, and bearing failure in this unit can rapidly progress to a sudden loss of forward propulsion, gear slippage, or full transaxle lockup at high speeds, creating an extreme collision hazard. Dealer/Independent Confirmation: Yes. Confirmed by a technician during a professional inspection that documented stored transmission codes (P0741,P2714 & P2757) and a $9,000+ replacement estimate at 75k miles. Manufacturer/Other Inspections: Inspected by an authorized Toyota dealer and escalated to Toyota Customer Experience (Case File Opened). Toyota acknowledged the diagnosis but denied goodwill assistance due to VIN parameters. No police or insurance inspections have occurred. Warning Lamps & Prior Symptoms: A Check Engine Light illuminated, prompting the inspection, but self-cleared before arriving at the dealer. Stored TCM codes confirmed an active failure. This self-clearing behavior masks an active mechanical defect, creating an additional safety hazard.

Filed Oct 28, 2026 · Transmission · WI

UA80 transmission which has known issues failed. Dealer reports that while the transmission has exact symptoms of other UA80 transmission that are covered under recall, our serial number is not covered. Quoted $12454 to replace transmission that has known failure issues

Filed Oct 27, 2026 · Transmission · MI

Within 1 mile of the Dealership, the new to us, 2018 Highlander was: -Lunging, not accelerating/Delayed shifting -Unpredictable surging -unintended acceleration -Excessive revving before upshifting I brought it back to the dealership & was given a loaner vehicle Once the transmission line was supposedly fixed, I drove it home. Then discovered it had leaked onto my driveway. They took it back & fixed something in the transmission again. After a few months, we thought it was good to go. In October 2026 it was doing all of the above lunging, lack of response from Transmission Again. I drove it to the dealership. Then told I needed a replacement Transmission. They said line rusted and was leaking. I have been asking if they have pictures from prior services. I have continually gotten under body washes & don’t believe that it started rusting while I was the owner. This transmission is obviously defective like the ones in class action lawsuits. I have called the dealer & now Toyota Customer Care to discuss them doing the right thing. Which I believe would be them taking responsibility and paying for the new transmission. It has been a month of waiting for a transmission to be located.

Filed Aug 27, 2026 · Transmission · VA

Transmission failure happened suddenly. I pulled out of a car wash and car would not accelerate. I was in heavy traffic and car wouldn’t move.

Filed Aug 20, 2026 · Transmission · IL

Vehicle has a high pitch whine on acceleration. Was diagnosed by Toyota dealer. Advised to replace the transmission. This VIN is not included in the CSP ZJC warranty but is a 2018 and is experiencing the same issue. Sound began at 110k miles.

Filed Jun 7, 2026 · Transmission · TX

Transmission failed at 65,000 miles right after the warranty expired. Cost to fix is $8,000. This is an epidemic issue with Toyota Highlanders built from 2017 to 2023. Tried to get dealer to cover but they said they refuse. They said that Toyota Corporate settled by paying all dealerships for potential repairs due to this issue, however all funds have been depleted. Basically no help at all. Pursued issue with Toyota Corporate for several weeks of escalations and appeals. In the end they completely refused to offer any solution other than for me to pay out of pocket. This issue should have been a nationwide recall due to the systemic failure on thousands of Toyota Highlanders. Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 4, 2026 · CA

My car had around 52,930 miles on it when the transmission suddenly went out and left me stranded in [XXX]. I always took my car to the North Hollywood Toyota dealership regularly, twice a year since I bought the car for regular service maintenance. When I was quoted nearly $7,000 to replace the transmission, I sold the car. Why would a 2018 Japanese car with such low mileage and in great condition suddenly have transmission problems? Something doesn’t add up. I had to get towed home. I’m wondering if other Toyota Highlander owners have experienced unexplained transmission problems as well. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 28, 2026 · Transmission · CT

Transmission failure (whining noise similar to the well-documented issue with UA80F 8-speed transmissions). I reported the noise and requested a specific diagnosis at approximately 95k miles --- no warning lamps/warnings were visible, just noticeable noise while driving without the radio on. On May 22, 2026, Torrington Toyota confirmed that the transmission was failed, but vehicle is drivable. As I purchased a Toyota Extended warranty, Toyota has approved the order of a remanufactured unit, which is on back order, so repair date is TBD/unknown. I lack confidence in the long-term viability of remanufactured unit, as this UA80F transmission continues to have issues, and will cost me $12k+ after the warranty expires, in the likely case that the remanufactured unit fails. There should be a long-term fix to this expensive issue.

Filed May 11, 2026 · Transmission · MN

UA80F Transmission failure at 100k miles for the 2018 Toyota highlander SE. No warning lights, engine noise (high pitched whine while driving). Took to the dealer and was told the transmission needed to be replaced.

Filed Apr 9, 2026 · Transmission · CO

The UA80 8-speed automatic transmission failed catastrophically without any prior warning symptoms while driving on the highway. During normal acceleration to pass another vehicle, the engine revved to 5,000 RPM as the transmission slipped, then dropped to 3,000 RPM coasting. After exiting the highway approximately one mile later and coming to a stop at a red light, the transmission would no longer engage in any forward gear. The engine revs freely when placed in drive and the accelerator is pressed. Reverse still functions. The vehicle had to be towed from the roadside. This created a serious safety hazard. The driver was stranded on the side of a busy road and lost all forward propulsion without warning while operating at highway speed. The failure occurred suddenly with zero prior symptoms. The vehicle was operating normally around town earlier the same day. The driver had no advance warning of any kind, no warning lights, no unusual noises, no shifting irregularities, before the catastrophic highway failure. This is consistent with reports from other UA80 owners who describe sudden, total transmission failure at similar mileage. The loss of forward propulsion at highway speed posed an immediate safety risk to the driver and surrounding traffic. The driver had to navigate to the shoulder and then reverse off the roadway to reach a safe location to wait for a tow truck. I contacted Toyota Customer Experience at 800‑331‑4331 and was assigned a case number. Goodwill assistance was denied twice. I was told the system would not allow the representative to proceed. I was disconnected twice during attempts to escalate to a supervisor. My case was then closed without resolution. Over 430 the federal safety agency complaints have been filed regarding UA80 transmission failures across multiple Toyota and Lexus models from 2017-2024. The pattern of failure is well documented. I am requesting the federal safety agency investigate this transmission platform and the adequacy of Toyota's limited CSP ZJC coverage.

Filed Apr 8, 2026 · Transmission · CO

I am reporting a documented safety defect in my 2018 Toyota Highlander (VIN: [XXX] ). On March 31, 2026, a certified technician at Groove Toyota (Work Order #XXX) performed a diagnostic inspection to investigate a severe 'airplane whine' noise. The technician verified the noise and used a stethoscope to pinpoint the source as 'very loud coming from final drive,' officially recommending a full transmission replacement at an estimated cost of $8,475. This failure is a direct mechanical match for a known factory assembly error (insufficiently bent locking tab) acknowledged by Toyota in Technical Service Bulletin T-SB-0160-18 and Customer Support Program ZJC. Despite the technician's formal diagnosis that the vehicle is mechanically unsound and requires immediate replacement for safe operation, Toyota Corporate denied my request for assistance (Case #XXX) on April 8, 2026. Toyota cited my vehicle's VIN does not fall into the customer support program, although it's essentially the same transmission, effectively refusing to remedy a documented manufacturing defect. This vehicle has excellent service records, and Toyota’s refusal to honor the spirit of the ZJC program leaves me with a documented safety risk that the manufacturer refuses to address. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)