2023 Toyota 4RUNNER

Purchased size 265/70R17 tires (Michelin Defender LTX M/S2) exhibiting severe highway vibration immediately post-installation. The vibration persisted continuously for two years across every rotation, posing serious handling and steering risks. For two years, local shop staff gaslit the customer, claiming an "out-of-round" tire or casing defect was impossible to avoid warranty obligations. During a visit in front of store management, staff repeated the claim in front of management. The customer then presented real-time technical data from Google on the spot, forcing staff to admit casing defects happen. Despite this, management cleared the driver to leave, assuring the vehicle was safe to operate with an infant inside. To obtain objective proof, an authorized TOYOTA dealership inspected the vehicle. The dealer verified steering, suspension, and alignment were completely sound and documented the root cause in writing: "Found front left tire has casing deformation." When escalated to corporate executives—including Robert Moyer and top management—an internal email chain revealed local shop management and corporate leadership actively placing profit over safety, contradicting logs and technical facts to deny warranty coverage. Confronted with dealer documentation and caught in their deceptive paper trail, the company fully refunded all tire replacement and balancing costs. Internal casing deformation is a critical safety hazard; belt/casing failure at highway speeds creates extreme risk of sudden tread separation or blowout. Dealership diagnostic documentation and the deceitful Executive email chain are available upon request. I also have video of shaking while on the freeway with my infant child in the car moments after Costco management assured me we were safe.

New, strange noise started in Dec'25 (41K miles; 2yrs 9 months). No warning lights. Diagnosed as failed brake accumulator (first at an independent shop, later at the dealer). Apparently the accumulator is part of the full master cylinder assembly which must be replaced. Toyota has quoted $3,200 to complete this repair and is telling me it must be out of pocket.

I was driving the vehicle and suddenly the steering wheel started to getting hard to turn it and the dash board doesn’t show any failure I went right away to dealership close by they inspected the vehicle they states there is a power steering failure but the car never showed any failure on dashboard or safety system

Windshield cracked approximately 2” from the bottom all the way across while using the defroster to clear ice from it. I was still parked at the time. I am unsure how long it will stay water tight or become worse. One concern is the crash avoidance and the automatic high beam sensor are both attached to the windshield and don’t want them to fail. I also don’t want the entire piece of glass to shatter and land in my lap while driving. The dealer refused honoring the repair under warranty. They only use one particular repair shop (which I suspect they own) and even quoted me a price for replacing the ruined glass. In addition to paying for that I would need to pay the dealer to recalibrate the crash avoidance and headlight sensor. I have yet to report the damage to my insurance. As of yet there are no warning lights showing.

The contact owned a 2023 Toyota 4Runner. The contact stated that while her father was driving under 30 MPH on a side road, the driver swerved to miss a deer. The vehicle drove off a hill, rolled over and landed on its top, and all the seat belts simultaneously unbuckled, causing all the passengers to hit their heads against the roof simultaneously. Additionally, the contact noticed an abnormal fuel odor. The contact stated that she was unable to exit the vehicle. The contact's brother assisted the contact in exiting the vehicle, and all passengers were able to exit the vehicle. The vehicle then caught on fire. The fire department arrived at the scene, but it was unknown whether the fire was extinguished by the fire department. The origin of the fire was unknown. A police report was filed. It was unknown whether the air bags deployed. The vehicle was towed and deemed a total loss. The contact sustained neck and back pain, bruises and headaches. The contact stated that the headaches could be due to an impact on the brain cyst in the back of the contact's head. The contact's son sustained neck pain, back pain and bruises. The contact's brother and father sustained unknown injuries. All the passengers went to the hospital the following day and were still receiving medical assistance. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 10,000.

the rear manual tailgate has opened 3 times while the vehicle was at highway speeds and the doors would be locked. the latest incident happened on 1-30-26, at highway speed (70mph) the tailgate opened completely without warning. the indicator on the dash did light up and an alarm did sound. I had been on the road approximately 10 miles without incident before that. this was the third time this happened, although the first two the door did not completely open, only became unlatched but stayed shut. all three times were mornings that were extremely cold. (below -1 F) each time i made sure there was no ice or snow or other object in the way of securely closing the tailgate. even if there were, the door would not be closed from the onset and the dash warning should have indicated the door was not completely latched.

Started driving on the freeway when we heard something on the roof of the car and when I opened the moonroof cover from inside the car I could see that the entire moonroof had shattered. All the glass was flying off the car and onto the freeway.

After adjusting the vehicle lock sound level in the settings, it completely disabled my key fobs and the panic function on the key fob. Had to take to dealer to fix. Dealer had never seen the issue before. Been reported online many many times. Dealers and Toyota refuse to acknowledge a known issue.

Component: Tire – Dunlop Grandtrek AT20 P265/70R17 Vehicle: 2023 Toyota 4Runner (approx. 25,000 miles) After a standard tire rotation, I began experiencing severe steering wheel vibration (flutter) at highway speeds (55–65+ mph) and during braking. The issue started immediately after rotation and has not gone away, even after returning the tires to their original positions. The dealer replaced rotors and pads, but the vibration remained. There are no warning lights, and no visible tire damage. This condition has been reproduced by the dealer. Upon researching, I found that Toyota issued Tech Tip T-TT-0602-20 for this exact issue — citing steering vibration caused by Dunlop Grandtrek AT20 tires on 4Runner models. I also found similar complaints from other owners on forums and the NHTSA database. The issue appears to be related to internal tire defects (e.g., belt separation or out-of-round tires) which are not externally visible. This problem affects safety due to potential loss of steering stability at high speeds, and could worsen over time. Tires have not been replaced yet, but I plan to pursue road force balancing and a manufacturer warranty inspection. I'm glad that I was able to find this problem early before it cause tire explosion. Tire Size: P265/70R17 Tire Brand/Model: Dunlop Grandtrek AT20

Vehicle begins to shake when speed reaches 60 to 70 MPH (issue has been happening since the vehicle left the lot). Shaking can be felt in the steering wheel, gas/brake pedals and front seats. Vehicle has been taken to a Toyota dealership three different times and after three realignments and tire rebalancing, the issue still persists. Several 4Runner owner forums are experiencing the same issue in this make, model and year; and suspect the issue might be stemming from a malfunctioning or broken needle bearing.

The car just accelerated while during into parking lot. I used brake but did work and hit on to the pole. It accelerated pretty fast. The parking lot store has a video of me coming in slow and the the car accelerated.

My vehicle is rear-ended by a large earth mover branded as a Kenworth. My vehicle was then pushed into another. After the initial impact, my engine went racing above 5,000 RPM. It was disengaged from the transmission. I switched my car into neutral, shut my car off and the engine was no longer racing when I restarted the car. Because of an engine racing, I am concerned about the potential that somebody's transmission would be engaged and it could cause serious further injury.