Warnings Problems of Toyota 4Runner

Toyota 4Runner owners have reported 6 problems related to warnings (under the forward collision avoidance category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota 4Runner based on all problems reported for the 4Runner.

1 Warnings problem of the 2023 Toyota 4Runner

Failure Date: 05/26/2025

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.

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2 Warnings problem of the 2023 Toyota 4Runner

Failure Date: 11/07/2023

November 2023l, my 13 year old daughter and I were involved in a car accident. A vehicle made a left hand turn in front of us and we collided (t-boned) the passenger side of the other vehicle. There were no warning lights, notifications of car crossing in in front of us, the assisted brake system did not activate, the air bags did not deploy, the on car assistance showed no accident reported. Other than the seat belts in the vechilde, no other safety features engaged. We have not been able to locate anyone who can confirm why no of the safety features did not work. Why did none of the safety features work and who can I contact. We no longer feel safe in this vehicle .

3 Warnings problem of the 2020 Toyota 4Runner

Failure Date: 07/18/2023

System malfunction—the ‘brake’ alert flashed and chirped when there was no obstacle on the road. Safety issue—I was about to hit the brakes but I realized in time there was no need. Confirmed? no not at this time. Possibly have it reviewed at next maintenance. No inspection yet. This has occurred infrequently in the past.

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4 Warnings problem of the 2006 Toyota 4Runner

Failure Date: 03/26/2022

Since an inspection oct 2021 the rust/corrosive on the frame has become. Dangerously close to rotting thru the entire frame! it’s not driven in the winter months when snow or ice melt (salt) is on the roads to prevent situations like this. With only 75,000 miles always garage kept and maintained like it’s brand new this vehicle might be able to be saved for a model in a shop class to practice welding. Something needs to be done because this ifvvjj.

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5 Warnings problem of the 2022 Toyota 4Runner

Failure Date: 01/26/2022

I purchased a 2022 Toyota 4runner and 9 days later the wiring harness was destroyed by rodents most like squirrels. Toyota switched to soy based wire insulation without taking precautions in the design to protect the wiring from rodents attracted to the insulation material. The resulting damage cost $8000 to repair and it will take months for the harness to be in stock. This failure caused all safety features to be disabled leaving the vehicle without standard safety functions.

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6 Warnings problem of the 2021 Toyota 4Runner

Failure Date: 01/25/2021

While driving in a snowstorm on an interstate highway at night on 1/25/2021, two important safety systems failed due to ice and snow buildup on the vehicle. Failure 1: the pre collision system (pcs) warning light illuminated indicating temporary failure of the pcs system (see photo 1). This was due to ice and snow buildup on the forward sensor, located on the front grille (see photo 2). Problem could only be rectified by stopping and physically removing the ice buildup, as referenced in the Toyota owner's manual, page 252. I recommend the sensor be relocated in front of the rear view mirror high on the windshield, where windshield defrost and the angle of the glass will reduce or eliminate the buildup. In the short term, perhaps a plastic air deflector or shield can be fabricated which will keep ice from interfering with the sensor. Failure 2: headlight high beam failure. The design of the headlight cover facilitates ice buildup over the entire structure (see photo 3). Since the high beam bulb is inboard and aft of the low beam bulb, it cannot penetrate the ice buildup at all, and makes the high beams completely ineffective. Weather conditions were: outside air temp: 30 to 32 degrees; night; heavy snow; altitude: 3,000 to 6,563 feet.

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Other Common Forward Collision Avoidance related problems of Toyota 4Runner



4Runner Service Bulletins
4Runner Safety Recalls
4Runner Defect Investigations