2017 Toyota Highlander acceleration problems

Filed Apr 13, 2026 · Acceleration, Driver assistance · IN

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

Filed Jan 5, 2026 · Acceleration, Transmission · WA

-- What component or system failed or malfunctioned, and is it available for inspection upon request? This report is regarding a premature transmission failure in our 2017 Toyota Highlander equipped with the UA80F 8-speed automatic transmission. Our highlander is currently stuck at High Tech Automotive in Wenatchee, WA 150+ miles from home after experiencing a transmission failure on the highway. -- How was your safety or the safety of others put at risk? During the transmission failure while driving on the highway the Check Engine Light came on as well as ABS light and vehicle went into a limp mode. The transmission failure and subsequent limp mode rapidly decreased our speed while traveling on the highway and forced us to limp the vehicle at low speeds across traffic putting ourselves and others traveling on the highway at risk. This vehicle has been well maintained and serviced in accordance with Toyota’s recommended maintenance schedule. Despite this, the transmission failed unexpectedly during a recent family road trip to Wenatchee, WA, leaving us stranded far from home. -- Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, the vehicle was towed to High Tech Automotive in Wenatchee WA (where it is currently stranded). The diagnostics report there confirmed proper transmission fluid level and a failed transmission with burnt transmission fluid. -- Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Not yet. A request for assistance was sent to Toyota today. -- Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps, or messages. We've had the vehicle maintained and there was a whirring sound which we had inspected at Dougs Auto Tune and Repair thinking it could be the timing chain or alternator but there was no indication of transmission issues.

Filed Sep 10, 2023 · Acceleration, Brakes · MA · crash · 1 injury

My car would randomly shut off at red lights, one time I was on a hill & thought I was going to roll back into the car in front of me. After restarting it would turn on. The radio would randomly shut off. We eventually replaced the battery. On a Fri.(Dec 17th) my car would not start, so my Husband drove the kids & I to school, upon my return the car started. He told me the wheel locks & I need to move it. Then on Mon. (Dec 20th) driving my daughter to preschool school…I have video from home camera showing your system will not let me attach a video) …my car stalling as I reversed out of the driveway. I loose all control, then you hear that I pulled the emergency break & stop just before two cars pass by. I then restart the car, it goes, I drive 3 houses down I pressed the break to make a left turn onto a side street, my car accelerated & smashed into a telephone pole on the drivers side. You can hear the crash on my home camera. The impact was so hard, it bent my a frame, my airbags did not deploy, my drivers side door would not open. I shifted the pole & cracked the frozen dirt ground around it as seen in the pics. I can provide a copy of the body work repairs. We paid our $1k deductible. The car jpeg image icon does is not show like the other pics attached, so I attached a screen shot as well. We have other pictures & video’s of damage to provide upon request

Filed Sep 22, 2020 · Acceleration, Transmission · 42,000 miles · PA

On 3 separate occasions at 30,000, 40,000 and 42,000 miles when driving at interstate highway speeds (around 70 MPH) with cruise control engaged, the vehicle has suddenly without warning switched to a low power limp home mode resulting in rapid deceleration in the midst of high speed highway traffic. I believe this is a very dangerous situation. Multiple warnings appeared on the dash including low power mode, check awd system, and see your dealer. Shutting off the vehicle and restarting it allowed the vehicle to be driven normally again. After all three incidents the vehicle was taken to the dealer for diagnosis. All 3 times the computer had stored codes for random multiple misfires along with a few others. All three times the dealer indicated that the codes did not point to a specific faulty part that they could replace, so there was nothing they could do. At my insistence that something be done after the third incident the dealer opened a case with the toyota tas system to ask for assistance in diagnoses. The only result of this was to switch some of the coil pack positions to see if the misfires followed the coil pack. The end result is that I have to drive it until it fails again, putting myself and others at risk. I also opened a case with the toyota customer experience center, they confirmed this was all toyota would do at this point.

Filed Nov 20, 2019 · Acceleration, Airbags · 25,000 miles · CA · crash

I turned my car to park in the church parking lot. I believe my foot was on the brake, it happened so fast, I am not sure. . All of a sudden the car began to accelerate on it's own! It scared the daylights out of me! Suddenly the car jumped through a wooden fence and off a five foot drop off to the street below. I was lucky there was a pile of gravel to stop me. I put it into park.the airbags did not go off. I was not hurt. But I am very stressed by the incident. It will be a month before it is fixed.

Filed Oct 8, 2019 · Acceleration, Engine · 14,680 miles · MD · crash

Tl* the contact owns a 2017 toyota highlander. While the contact was parking the vehicle, it suddenly sped forward, drove over a median, and crashed into a tree. There were no injuries and a police report was not filed. The manufacturer offered to inspect the vehicle or process a request for the vehicle to be repurchased. The contact was unsure of which option to take. Darcars toyota frederick (5293 buckeystown pike, frederick, md 21704, (301) 696-6300) was contacted, but did not diagnose or repair the vehicle. The cause of the failure was not determined. The failure mileage was 14,680. *bf manufacture was notified.

Filed Aug 22, 2019 · Acceleration · 19,850 miles · KY

Cruise control on speed at 45 MPH, lifted cruise lever 5 times to posted 50 MPH speed going onto interstate apron/bridge. Lifted the cruise cont lever and held to accelerate to posted speed of 60. Released lever at 60 MPH, but noticed car still accelerating. Pulled on lever to cancel when car was at 75 MPH. Car has 19,850 miles

Filed Aug 8, 2019 · Acceleration, Driver assistance · 37,516 miles · LA · crash · 1 injury

My toyota highlander would not go into park. The SUV lunged forward over curbing and into building. Then went violently into reverse and into a uncontrollable spin. Then the SUV went violently into drive and jumping over a curbing and into a ditch and was sitting on top of a natural gas line. During this whole time I was pressing the brake and pushing the ignition switch trying to turn off the engine. This was done in a parking lot as I was trying to park. *dt

Filed Nov 6, 2018 · Acceleration, Engine · GA

On sunday oct 21 2018, the driver had just left the olin rest area in north carolina, heading northbound on rt 77. After driving for a little bit the car suddenly acceleration unintentionally by itself. And the car started to zig zag across the highway lanes without the driver turning the steering wheel. The driver tried to press on the brake but it was not effective. The car then grazed an highway guardrail and it partially ripped off the rear left side and rear bumper. The driver kept pressing the brake without effect while swerving across the lanes. Then suddenly the brakes started to work and the driver was able to bring the car to a stop on the right shoulder. The driver put it into park but the engine kept revving at high RPM until the driver turned off the engine. I think the car had a sudden unintended acceleration incident due to the electronic throttle control. In addition, I think the zig zag was due to the electronic traction/ stability control, sending excessive power to a wheel on a particular side of the vehicle when it didn't need it.

Filed Dec 29, 2017 · Acceleration, Engine · 7,000 miles · OR

While driving up the I-5 grapevine at 72 MPH the car suddenly slowed without any warning to under 20 MPH. The check engine light turned on and the dash said awd system disengaged or error or some similar message and to take to the dealer. I was barely able to accelerate to get off the road. I pulled off, turned the car off and back on, and it started running again. I'm lucky I was not rear ended.