2021 Subaru Forester Driver assistance Problems

My Subaru Forester has a significant safety defect. If my web searches are representative this software problem affects multiple models and years of Subaru. I have addressed this problem with the local dealer, Subaru America, and Subaru Japan and have been told "that is the way it was designed and it is supposed to do that." As you may imagine that is not a satisfactory answer to a significant safety issue; I can only imagine Ford saying the Pinto was designed with a gas tank that explodes in a collision or a more recent Takata claiming that their seatbelts were designed that way. So here is the problem in a nutshell (and I have a host of Emails from various levels of Subaru if you want the details of how I have attempted to get them to address the issue.) There is a sensor on the gas cap that detects if it is not fully closed since that is a pollution control issue. (More on that later) When that sensor is activated, it disables the Subaru Eyesight system and when the Eyesight system is disabled it disables every safety feature except the seatbelt and it lights up the dash with a dozen alarms none of which have anything to do with the gas cap. That takes down collision avoidance, lane changing, and autodim headlights among others. It also wants you to check the engine and consult the users manual. None of that has anything to do with the actual situation. Now I have taken the car to the dealer who assures me it is operating as designed and there is no fault in the sensor. When you close the gas cap there are audible clicks and as a 190 pound man I can assure you that the cap is fully closed when I close it. But on a random basis the dashboard lights up despite the fact that the gas cap is fully engaged and the safety systems become disabled. Usually it stays lit up until I refill the tank, but its behavior is not predictable - occasionally it just resets as I drive. Besides the obvious hazard of having safety systems which do not work, havi

NHTSA ID

11738084

Incident

May 14, 2026

I am writing to file a formal complaint regarding repeated, severe, and dangerous malfunctions of the vehicle's engine Start/Stop (Idle Stop) feature. The system is failing to operate as intended, resulting in the engine stalling while the vehicle is in motion or under crucial driving circumstances, creating significant safety hazards. History of Incidents I have experienced four separate incidents where the engine unexpectedly stalled or shut down, creating extreme risk: Incident 1 (Railroad Tracks): The engine stopped while I was actively driving over railroad tracks. The car stalled on the tracks, and within seconds of the engine restarting, the crossing gates came down and a train passed. I narrowly avoided being hit by the train, missing the impact by approximately ten seconds. Incident 2 (Heavy Traffic/Bridge): During heavy, back-to-back traffic as a bridge (PGA bridge) was opening, the car momentarily stopped and then resumed movement. The unpredictable stopping motion created a severe risk of being rear-ended, as the following vehicle would have had difficulty anticipating the sudden, unintended stop. Incident 3 (December 2025): While taking a right turn, the engine stopped suddenly, with dash lights blinking, during only a slight pause in vehicle movement. This occurred while the vehicle was still maneuvering. Incident 4 (The following day): The engine stopping malfunction described in Incident 3 occurred again the next day. Attempted Repair and Ongoing Concern Two years ago, the dealership installed a new battery following the first two incidents. However, the problem has now recurred this week (December 2025). The dealership has informed me that using a third-party device to permanently disable the Start/Stop function would void the powertrain warranty. Causing Mechanical Stress: I believe the continuous, potentially faulty activation is putting unnecessary stress on the battery, electrical system, and engine components, which may ultimately shor

NHTSA ID

11702915

Incident

Dec 1, 2025

My Subaru has an auto start/stop. I was at a complete stop, making a left-hand turn, and my car completely shuts off with the following message: For safety, auto restart disabled; eyesight with a \ through the words, put car in park and restart vehicle. In the time it took me to put the car in park and restart, I was almost T-bone. This was terrifying. This had happened on previous occasion in stop and go traffic which is dangerous because my car has come to a complete stop without any warning to me where the driver behind me There are no warning symbols, warning lights, or any type of signal or symptoms to notify me that my car was going to stop completely.. Typically I remove my foot from the break, the car starts and then I put my foot on the gas pedal and the car moves forward. In the situations described above the car just stopped.It just flat out stopped. There’s never been any indication or signal to indicate the car is not going to restart The retailer replaced my battery and said it should help. I called the Subaru factory rep who was of no help. She said she is not a trained technician and all that she could offer to do was to contact the retailer. The dealer was not able to reproduce the problem. The retailer replaced the battery without any response about the safety issue. I asked if Subaru had a safety board I could report this too and the factory rep said no, but she will document it and they’ll do an internal review to see if we have any other similar issues reported, however, they will not contact me because they don’t talk to the public about these issues. I told her there are hundreds of these if not, thousands concerns online stating the same issue. The rep said she would document my concern. Documentation is good if there’s a fix but I’m concerned about the unnecessary death of a driver.The retailer also advised I could do the auto start override, I’m trying to make a point of how serious of a safety issue this problem can be. Thank you!

NHTSA ID

11698565

Incident

Oct 29, 2025

Unintentional Acceleration - 2 times within 4 days of each incident. 9/17/25 while stopped to pull into a parking lot my 2021 Subaru Forester accelerated as I was stopped. I had to slam on the brakes, take a deep breath and was shocked at the pull and speed the car wanted to go. 9/20/25 Pulled into a parking spot, not moving and the car again pulled and accelerated. Again I slammed on the brakes to stop from crashing into other vehicles or whatever was in the vicinity the car wanted to go. There were no warning messages, no symptoms prior to these 2 incidents. The car only has about 24,000 miles on it and all maintenance has been done on time and at the dealership. No outside mechanics have ever worked on the car. I called AAA to tow me as I was not safe to drive the car and had it towed to the Suburu Dealer where I purchased the car. This is an extremely dangerous situation. The floor mats were not near the gas pedal or the brake pedal and It was absolutely 100% not my error in foot pedal placement. I will not drive the car any longer until the dealer calls to tell me what is wrong or what they have found to be the problem. There is a civil lawsuit against Subaru for this situation but when mentioning it to the dealer they acted like they knew nothing about it. This is not something that should be ignored. I was lucky the 2 times it happened and I hope to God it never happens again!

NHTSA ID

11688867

Incident

Sep 17, 2025

I was going down a highway using the lane keeping assistance feature. Suddenly the vehicle stopped following the road and ran me into a ditch. I was able to steer back onto the road, but if the ditch had been deeper I believe there would have been a rollover accident. The root cause is that when the audio system is turned up in the vehicle, the warning chimes do not interrupt the music or sound loudly enough to be heard over it. When the vehicle needs manual intervention assistance staying on the road, the driver may not hear the warning sound in time before the system disengages. The warning chime sounds need to be able to be heard over the audio system. This exact thing has happened to me 2-3 times in the last year.

NHTSA ID

11688606

Incident

Sep 20, 2025

After arriving home from a short drive to the grocery store I parked my car in the drive way and went inside. On the drive home I could hear a low humming coming from the speakers and the car was decelerating when the accelerator was not being pressed, no warning lights or sounds came on. About 10 minutes after I parked a neighbor knocked on the door letting me know my car was smoking from inside the hood. Within a minute or 2 the entire hood of the car was engulfed in flames. The entire front half of the car burned to a crisp, the fire also burned half a tree. The car was burning so hot that it melted the hood of the car, had I parked it with the hood facing my house my house would have caught fire. The problem has not been reduced or confirmed by dealer or independent service. The vehicle is being stored by the insurance and for the time being is accessible for investigation. Because I was having trouble with the infotainment system, the humming coming from the speakers, and a recent warranty extension by from Subaru for the infotainment system due to known issues I suspect that the fire was caused by electrical issues.

NHTSA ID

11681870

Incident

Aug 11, 2025

Vehicle unexpectedly brakes for no apparent reason, has almost caused us to be rear ended. Subaru inspected vehicle, says the Eyesight ADA camera needs to be replaced at our cost. This vehicle is only 4 years old and has 38,000 miles. This is clearly a safety defect.

NHTSA ID

11680144

Incident

Aug 12, 2025

On August 12, 2025, at approximately 10:16 AM, while driving at normal speed on CR-43 NW southbound just past Minnesota Ave in Big Lake, MN, my Subaru’s EyeSight Driver Assist System, specifically the Automatic Emergency Braking (AEB) / Pre-Collision Braking System, suddenly activated without warning and with no obstacle present. The braking was abrupt and unnecessary, causing the vehicle behind me to nearly rear-end mine. Road conditions were clear, dry, and unobstructed, with no pedestrians, vehicles, or hazards in my lane. This appears to have been a “false positive” from the AEB system. This sudden stop placed both my safety and the safety of other drivers at serious risk, and in different circumstances could have caused a collision resulting in injury or death. The vehicle is available for inspection upon request. The problem has not been reproduced or confirmed by a dealer or service center because Subaru requires a $200 diagnostic fee, which I have not paid. The vehicle has not been inspected by Subaru, police, insurance, or any other parties for the same reason. No warning lamps, error messages, or other indicators appeared prior to the incident. All systems appeared to be functioning normally before the unexpected braking occurred. I am concerned this defect persists beyond 48,000 miles, outside the limits of prior settlements, and believe Subaru should issue a recall covering all affected vehicles, regardless of mileage, to prevent potential crashes.

NHTSA ID

11680124

Incident

Aug 12, 2025

While driving on I-17 Southbound near mile marker 311 at approximately 75 mph, I experienced a sudden and dangerous malfunction of the Lane Keep Assist (Auto-Steer) system in a 2021 Subaru Forester. The feature was active at the time and unexpectedly veered the vehicle sharply toward the concrete wall on the left shoulder of the highway. I attempted to regain control, but due to the abrupt nature of the malfunction, I overcorrected and collided with the wall on the rear driver side. There were no vehicles in the immediate vicinity, or this could have resulted in a multi-vehicle collision at high speed. I hit my head during the impact but did not require emergency medical services at the scene. Road conditions were dry and clear, with no visible debris or extreme weather factors. There were no warning lights or error messages from the vehicle prior to or during the incident. The Auto-Steer system did not disengage on its own before veering off course. This was the first time driving this particular vehicle, which was a company car, and I immediately reported the incident to my employer. The damage was reported and the vehicle is seemingly available for inspection. At the time of this report, the issue has not yet been formally diagnosed by a dealer or service technician. The failure of this driver-assist feature significantly endangered my safety and potentially the safety of others had there been nearby traffic. I am filing this report so the issue can be investigated, and similar malfunctions prevented in the future.

NHTSA ID

11672501

Incident

Jul 10, 2025

I commute with my car and recently it started to speed up all by itself. I removed my floor covers thinking the gas pedal might be stuck on it but that wasnt the problem. While accelerating from a stopped position, it revs up and accelerates rapidly all by itself. Tapping the break pedal to deactivate accidendal cruise control doesnt work. I have to slam the break just to stop it from accelerating on its own. This is the fourth time it's happened. I have my personal mechanic change the oil every 3k miles and follows the factory recommendations on all other manufacturers recommendations. Very scary to drive because it happens at random.

NHTSA ID

11667900

Incident

Jun 19, 2025

Was stopped at traffic light. Start Stop system was engaged. Engine turned off as normal. When I took my foot off the brake the engine did not engage and the Eyesight warning light came on that the Eyesight system was not functioning. Put the car in park and engaged the ignition button and the engine started. Turned off the Start Stop system and the car functioned normally after that. Have read postings on Subaru forum that this has happened to others.

NHTSA ID

11654189

Incident

Apr 11, 2025

The contact owned a 2021 Subaru Forester. The contact stated that his wife attempted to turn into a parking lot while her foot depressed on the brake pedal, the vehicle jolted into acceleration, ultimately crashing into two parked vehicles at 5 MPH. The front passenger side of the contact's vehicle crashed into the front of two vehicles. No property damage was reported. The vehicle came to a stop upon impact. The air bags did not deploy. The vehicle was not towed. The Steering Responsive Headlight Warning Light was illuminated. A police report was filed. The vehicle was destroyed. No Injuries were reported. The local dealer was not contacted, and the vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 39,500.

NHTSA ID

11653275

Incident

Mar 24, 2025

Mileage

39,500 mi

**Component Malfunction**: The windshield developed cracks shortly after purchase, which expanded without impact, affecting visibility and causing the Safety Eyesight system to malfunction. **Safety Risk**: The expanding crack impaired vision and led to safety system malfunctions, posing a risk to driver and passenger safety. **Problem Reproduction**: It is unclear if the issue has been reproduced or confirmed by a dealer or service center. **Inspection Status**: The vehicle has not been inspected by the manufacturer, police, or insurance representatives. **Warning Signs**: There were no warning lamps or messages prior to the failure; the issue appeared in the first week after purchase.

NHTSA ID

11617156

Incident

Jul 22, 2024

I’ve owned the vehicle under a year and am already on my second window replacement. I drive the same route everyday and ever experienced windows cracking in any other vehicle before this vehicle.

NHTSA ID

11598420

Incident

Jul 1, 2024

The 2021 Subaru Forester had been functioning normally with no warning lights. About 25 minutes into the drive I had come to a stop light on an upward incline. When the light turned green I moved from the brake to the gas as usual. However the auto-start function on the car failed, causing the engine to stall. A loud clunking sound was heard and the dashboard lit up with multiple lights, although I do no recall which ones were illumined. I attempted to press the gas again and the car did not respond. During this short time my foot was pressing on the gas the car rolled backwards and collided with the vehicle behind me. I continued attempting to press the gas pedal and still no acceleration was made. After parking and restarting the car it has resumed normal function. I have not yet visited the dealership so this issue has not yet been reproduced, nor has the offending system been inspected. I'm summary, the automatic engine start failed at a critical location, putting myself and others in serious danger and ultimately caused a crash.

NHTSA ID

11571429

Incident

Feb 12, 2024

The contact owns a 2021 Subaru Forester. The contact stated while driving 40 MPH, the automatic emergency braking system activated, bringing the vehicle to a complete stop. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was taken to the dealer, who was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 24,000.

NHTSA ID

11560155

Incident

Nov 30, 2023

Mileage

24,000 mi

I slowly pulled into a parking space at a grocery store. I took my foot off the accelerator, and the car jerked forward, traveling maybe 2-3 feet. I quickly put my foot on the brake and was able to stop the car. I took the car to the dealer, and the service consultant told me that she thought that a memo had just come in addressing the kind of incident I had. She also told me that another customer's car had accelerated into a bush and that the owner was so rattled that she traded her car in for another car. However, the service repairman said that he ran a lot of codes and was unable to find anything wrong. He told me that Subarus have never had unintended acceleration problems. Now I have a loaner car from Subaru, and my car is at the dealership awaiting a visit from a higher-up Subaru person who is over the local technicians. Last year, I brought the car in for several issues, one of which was an unintended acceleration while parking at another grocery store. Last year I was told that the instrument that looks for problems ran lots of codes and could find no record of the incident.

NHTSA ID

11544282

Incident

Sep 10, 2023

The contact owns a 2021 Subaru Forester. The contact stated while parking the vehicle in a parking lot, the vehicle accelerated independently and jumped the curb and into the bushes. The contact attempted to reverse the vehicle but continued to also accelerate independently in Reverse. The contact stated the gear shift was on Neutral and continue to Rev loudly. The contact stated the vehicle stop on its own due to the tires deflating. The contact stated no one was injured nor sought medical attention. A police report was not filed. The vehicle was not drivable. The contact towed to the local dealer but was unable to duplicate nor diagnosed the failure. The manufacturer had been informed of the failure. The failure mileage was unknown.

NHTSA ID

11527951

Incident

May 30, 2023

Braking system sometimes is activated by a sign on the side of the road, by a tree if we are turning, or nothing at all. Nearly in 2 rear end collisions when the system activated incorrectly. We cannot drive into our garage with the system activated...brakes keep slamming on. The only safe way to operate this subaru is to manually turn it off every time we start the car. Subaru dealership states it cannot recalibrate the eyesight system as it does not have that ability. Dealership is in Corvallis oregon. Lane notification system also has issues in construction zones (it tries to steer the car into the water barriers marking the lane changes. At least the side warning system can be permanently disabled. We have filed many complaints with subaru to no avail. Promised return phone calls never happen, phone transfers to their technical department result in dropped calls. This system is dangergous!!!

NHTSA ID

11522161

Incident

May 15, 2023

The first incident occurred when I drove into a parking space, applied the brakes, and the car suddenly sped forward, so I had to repeatedly jam on the brakes to make the car stop. Fortunately, no person or vehicle was directly in front of me. In the past week, we have experienced problems with the ADAS. We were backing into a parking space at night and made contact with a parked car. Our car made no warning sounds or lights to warn us. The following day, the blind spot detector light went on and off intermittently, sometimes with an exclamation point, and sometimes without an exclamation point. The lights on the mirror did not come on when cars were approaching from behind. We are making an appointment with the dealer ASAP.

NHTSA ID

11510842

Incident

Mar 6, 2023

It was a very cold night on Dec. 21, 2022. I traveled out of town. I don't recall seeing or hearing anything hit my windshield. However, on Dec. 22, 2022 when I got back in my car, I noticed a very long scratch across the windshield. It is now Mar. 1, 2023 and it has gotten much worse. I am unsure how to go about getting it fixed because I cannot pay for the repairs.

NHTSA ID

11509755

Incident

Dec 22, 2022

My Forester needed new tires at 13,250 miles. I had my tires rotated and that is when Subaru noticed the worn tires. I called Subaru Corporate and they informed me that do not replace tires. I bought new tires and then went to have a wheel alignment. The technician told me he could do the alignment but he couldn't adjust the Lane assist diagnostic or the VDC and other safety features. Now I am unsure what to do. I have tried to resolve this with Subaru of America without resolution. Hopefully, you will be able to help me. Why are Subaru dealers not doing these adjustments? Thanks for your help with this serious situation. [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

NHTSA ID

11504436

Incident

Jan 27, 2023

The contact owns a 2021 Subaru Forester. The contact stated that while the vehicle was parked, she shifted the gear shifter into reverse(R) and the vehicle experienced unintended acceleration and lunged backward, crashing into another vehicle. Additionally, the vehicle made abnormally loud noises and was extremely hot after it was turned off. The contact did not sustain any injuries. No police report was filed. The vehicle was taken to the dealer, and the dealer inspected the brake system. The dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 7,000.

NHTSA ID

11482284

Incident

Aug 10, 2022

Mileage

7,000 mi

on 7/9/22 @ 6:00p I was with my wife & 2 grandsons going into a diner parking lot. as I was slowly going into a spot the car suddenly and without warning accelerated causing the car to drive over a cement parking stop, over a 1foot high cement wall, through a chain linked fence which had privacy covering, down into a 12 deep ravine. after shutting off the car my grandsons, wife & myself had to crawl out through the rear hatch. when things quieted down we realized that none of the safety features were activated (anti-collision warning, anti-collision braking) I thank God no one was hurt. Subaru needs to look into this so in the future no one ever experiences this.

NHTSA ID

11473641

Incident

Jul 9, 2022

I was coming out of my garaged ( car was facing forward) . The car seemed to hesitate as I tapped the gas pedal. I thought maybe this was because the car sensed the sides of the garage via the rear view mirror sensors. I am always careful when exiting my garage so as not to ding the rearview mirrors. I repeatedly tapped the gas lightly about three times but the car hesitated each time and did not want to seem to move forward. One last time I tapped the gas and the car bolted out of the garage jumped the curb across the street at an unexpected rapid speed. I did not have my foot on the gas pedal. The car lunged forward , crossed the street and hit the garage door and frame of the house across the street for me doing structural damage. I believe this to be unintended acceleration for which other Subaru models have experienced problems. The air bags did not deploy. Please see similar accident for another example of this same scenario with the same make model and year as my vehicle: https: //www.google.com/amp/s/www.torque net.com/1084/subar-acceleration-lawsuit-update-forester-slams-garage/amp

NHTSA ID

11469925

Incident

May 29, 2022