2017 Toyota Highlander: sudden loss of power

Filed Sep 21, 2026 · Driver assistance, Transmission · FL

customer support program ;; ZJC....Toyota has received reports about potential symptoms, such as a whine noise from the transmission while driving, harsh shifting, reduced power, , in the subject vehicles that are equipped with a model UA80 transmission. There is a possibility that a washer tab, designed to prevent the loosening of a nut inside the affected transmissions, was not sufficiently bent during assembly. This could lead to the nut loosening and, over time, lead to the symptoms described above. i.ve been having this issue with my transmission for a couple of years. my issue started ,when i first got this highlander back in 2017 .when coming to a stop ,i would get a thumping sound from tranny .i took this SUV to dealer ,twice for said tranny issue and pre collision system not functioning properly was told nothing wrong! this happened while suv was still under warranty! i eventually need to replace front windscreen : after which pre collision was functioning properly this was done by Safelite AutoGlass! a couple of months the tranny had a new issue ,tranny began to hesitate. a few months went by and then another new symptom developed ,i was getting shuttering at 1400 rpm ,which goy worst if you were at this rpm for a little while. I've been sick for a couple of years now and was not able to take to dealer to diagnose issues associated with tranny. i've kept driving my highlander with these issues ,since it started!! CUSTOMER SUPPORT PROGRAM ZJC addresses some of the issues i have with my transmission. i don't know why my transmission and vin# is not included in this program.. i'm worried if i went to doctors appt and highlander broke down ,what i'm going to do..i'm on social security disability ,i cant afford much !

Filed Aug 27, 2026 · Engine · CO

My 2017 Toyota Highlander, VIN [XXX], has just under 85,000 miles. I was notified at the dealership (Stevinson Toyota in Lakewood Colorado) who inspected the vehicle yesterday that the vehicle has developed a timing cover oil leak on the passenger side. After further research I learned this is caused by premature failure of the factory applied FIPG sealant at the timing cover’s T junction. This is well documented as a known, widespread defect in the V6 engine used across multiple Toyota and Lexus models between 2014 and 2019. This failure is not due to wear, neglect, or misuse. It is the result of a documented manufacturing flaw that requires full engine removal and carries an extremely high repair cost — a burden that should not fall on customers when the underlying cause is a defective sealant application at the time of manufacturing of the vehicle. I was quoted $5400. I am deeply concerned that Toyota has not issued a recall for this problem, despite its prevalence and the clear safety risks it presents. This leak is not merely a “durability issue.” It has legitimate and serious safety implications, including: •The potential for engine fire due to oil contacting hot components •Serpentine belt failure, which can cause sudden loss of power steering, alternator function, and vehicle control •Additional engine damage if the leak worsens •The possibility of the vehicle breaking down in unsafe or remote conditions Any of these outcomes pose a real safety hazard to drivers, passengers, and others on the road. Toyota’s decision not to address this known defect through a recall is extremely disappointing. I have reached out to Brand Engagement and was turned down by a gal named [XXX]. I then escalated the issue and was again turned down by a gal named [XXX]. I firmly believe Toyota should have issued a recall for this known issue costing consumers $5400 to repair a safety issue due to what is documented as a manufacturing defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B

Filed Jul 10, 2026 · Fuel system · NC

The engine stalled because the fuel pump is failing. We have found that many 2017 Toyota Highlanders have had the fuel pump recalled for this exact issue, yet our VIN is not included in this recall. We experienced the exact issue the recall was issued for stalling while driving. Issue on July 24, 2027: The engine stalled while driving on the highway at high speed and lost power steering, creating a major safety issue. We had our vehicle towed to a car care center. The car care center identified diagnostic codes related to low pressure fuel system pressure, engine stall history, etc. but cannot reproduce the issue. After checking multiple systems, he believes the issue is a failing fuel pump. Background: Over the past 6 months, we have had problems with the check engine light turning on. On multiple occasions, we have brought the car to get diagnosed and the reading has consistently been fuel pressure codes. Each time we get the car diagnosed, the technician could not reproduce the issues and cleared the codes without resolution.

Filed May 24, 2026 · Transmission · PA

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.

Filed May 7, 2026 · Transmission · MD

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)

Filed Aug 27, 2025 · Fuel system · UT

Today (8/26/2025) my wife experienced the engine light kicked on and that the AWD system needed to be checked. After fueling up it made knocking noises and difficulty starting, and took two times to start up. Ran an OBD scan and this is what it says, which is related to fuel pump low pressure. P117B - Fuel Pressure Sensor Circuit Range/Performance Severity - High Description - Indicates a problem with the fuel pressure sensor circuit, where the sensor's output signal is outside the expected range or performance criteria, leading to potential issues with fuel delivery or engine performance. P0174 - System Too Lean (Bank 2) Severity - High Description - Your engine is getting too much air and/or not enough fuel, this is known as a "Lean" condition. Excess oxygen is getting into your engine, which makes the combustion process less efficient. This could be caused by many different factors. Consequences of Continued Driving - Reduced power, Engine knocking, Rough idle

Filed May 23, 2024 · Transmission · WA

In city driving, vehicle began exhibiting slightly delayed shifting from 1-2 and 2-3. Downshifts from 3-2 seemed slightly rough. Approximately 5 minutes later when accelerating from a stop on an uphill grade, the shift from 2-3 was delayed (2nd gear disengaged, engine speed increase ~1000RPM, then shifted to 3 abruptly). At next stop, lower gears where not available. Vehicle seemed be in 4th(?) gear when accelerating from a stop. Very little power available. Had to engage hazard flashers and other vehicles navigated around our vehicle. Managed to limp car ~ 1 mile to home. Approaching driveway, Master Warning Light, Check Engine Light and 4WD Warnign light all illuminated. This issue created a loss of power that impaired the drivers ability to maintain a safe speed relevative to traffic. Had this issue occurred during high-speed operation, the vehicle may have been disabled in a high-risk area. Transmission appears to be unreliable.

Filed Mar 13, 2024 · Fuel system · 125,000 miles · WV

The contact owns a 2017 Toyota Highlander. The contact stated that while driving 50 MPH, the vehicle started jerking, the RPM decreased, and the vehicle started losing motive power. The message "Reduced Engine Power" was displayed. The contact stated that she came to a complete stop at a traffic light. The contact stated that while attempting to drive from a complete top, the vehicle stalled. The contact was able to restart the vehicle; however, the vehicle jerked increasingly while driving. The contact veered to the side of the road, where she remained. The contact stated that the failure had been occurring for months. The vehicle was previously taken to the dealer, where it was diagnosed and determined that the low-pressure fuel pump had failed. The vehicle was not repaired. The contact related the failure to the federal safety agency Campaign Number: 20V682000 (Fuel System, Gasoline) however, the VIN was not included. The manufacturer was notified of the failure and informed the contact that they could not assist because the VIN was not included in the recall. The failure mileage was approximately 125,000.

Filed Oct 9, 2023 · Transmission · GA

Driving on the highway vehicle suddenly drop speed. I was able to exit but not proceed forward once exiting. The vehicle was towed and diagnosed with need for new transmission. There was a customer support program bulletin POL 19-04 noting similar problems. However, Toyota is stating this 2017 is not associated with the program. The whine noise and reduced power are all listed with this program. The vehicle sudden reduce power may have resulted in a major accident on busy Atlanta highways. A known transmission issue that Toyota is not willing to support customer in resolving is unbelievable. I was basically told because the vehicle was not serviced at a Toyota dealership regularly, they cannot support.

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 Apr 5, 2023 · Electrical, Engine · NC

Within 6 months of purchasing this car used at a Toyota dealership, the check engine, exclamation light, and "Go to dealership/check AWD" lights came on. I took it to the dealership who told me it would cost $250 just to check the lights. I took it to a car parts store who said "it's throwing a bunch of old codes". The dealership also suggested during oil change about $800 worth of work needing to be done and said my warranty I purchased would not cover it so I left. I had the fuel system flush done somewhere else.The lights went off for about a week and then came back on. About a month later.... While driving down the highway at a speed of approximately 60 mph, the rpm's and speedometer went haywire - jiggling and then decreased (and a weird sound like the car revving) even though foot was on gas, the car rapidly lost power and had to pull over on side of highway at night - this is of course very unsafe. Had to pull over and turn off car. Would not start right away but did after a few minutes. Took to mechanic - they could not find anything wrong. Could not reproduce. A few days later, after getting gas, car would not start. Had to wait an hour and then it did. Took back to mechanic, discovered water on spark plugs so had spark plugs replaced. Four days later, all the warning lights back on and car running roughly (like maybe lightly missing?). Component or system failure cause still unknown and yes it is available for inspection. Very frustrated and frankly a bit terrified to drive this very expensive vehicle.

Filed Mar 12, 2023 · Transmission · WA

Transmission lost power while driving and began to slip. Had to pull over immediately. Check engine light illuminated. Happened again several more times before I was able to take to dealer. Dealer was able to reproduce and diagnosed as transmission failure requiring replacement for $10k. Due to the low miles and age (6 years, 3 months) I requested that Toyota help cover costs which they declined to do. This is a dangerous situation and I believe Toyota should have fixed as goodwill.