2021 Subaru Forester Complaints

UNKNOWN OR OTHER — Filed 10/09/2026

Driver side rear window spontaneously failed while driving on the highway. Passenger experienced cuts due to glass fragments

POWER TRAIN — Filed 09/30/2026

The transmission very suddenly (perfectly fine one day, bad the next) developed a severe transmission slip. Like getting rear ended feeling transmission slip. Dealership quotes the CVT control valve body.

ENGINE,FUEL/PROPULSION SYSTEM — Filed 08/16/2025

On two separate occasions, less than one year apart after Subaru Service replaced my battery with a “larger” battery without my knowledge my vehicle suffered sudden, catastrophic electrical failure while moving in active highway traffic, causing an immediate loss of propulsion and creating a life-threatening safety hazard. This has happened two times the second time less than a year after the “larger” battery replacement. This car has less than 50,000 miles on it and has a perfect service record all done at AutoNation Subaru Carlsbad. We refuse to drive this car, even though it has been serviced and a new battery has, yet again, been installed. We have no faith in this car and are not willing to put ourselves in a life-threatening situation again. We also do not feel comfortable selling this car, even though we have received many above market offers. We do not feel that we can sell this car in good conscience to an unknowing next victim. It is unsafe to drive and can lose power at any moment while driving without any explanation given from Subaru. The first battery failure occurred prematurely in August 2025. Asked repeatedly why a car battery would fail while driving? Could not get a straight answer except that someone finally said it could possibly be from the auto stop start system The new larger battery failed less than one year later in August 2026, so it didn’t even last a year and it was larger. The service department at AutoNation Carlsbad told me my car passed all the test and I have nothing to worry about. This goes against any common sense. How could this happen 2 times where no issue has been disclosed. Both situations were extremely traumatic and dangerous and I feel lucky that I was able to come out of it. I’m not sure the next time would be the same. We are not able to drive this car because common sense tells us there is a bigger issue going on. So far we’ve communicated with Subaru of America and were denied California Lemon law without reason.

ELECTRICAL SYSTEM — Filed 06/15/2026

The contact owns a 2021 Subaru Forester. The contact stated that while trying to roll up vehicle windows from driver sits and passenger sit they would roll up to 3/4th all the way up and they would roll back down after. The contact stated this was a recurring event. The dealer was aware of failure and diagnosed issue needing repairs for window regulator and run channels for driver and passengers side. Manufacturer was made aware of failure and let contact know it was outside of warranty. The failure mileage was approximately 22,500.

POWER TRAIN,ELECTRICAL SYSTEM,ENGINE — Filed 07/01/2026

My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning lights illuminate, a continuous alert sounds, and the vehicle cannot proceed until I shift to Park and restart manually. This has left me immobile in live traffic at lights, stop signs, and mid-turn. The system also attempts to shut down in unfavorable moments, such as mid-turn, or as I am already releasing the brake (meaning it was depressed only lightly or briefly); it then tries to restart while still mid-shutdown, producing a pronounced shake. This is not a battery-charge problem. It has occurred even when the battery tested above its rated cold-cranking amps, and after each failure the engine restarts smoothly by manual start, indicating the starter, engine, and fuel systems function normally. I raised this before 2024, but it was not recorded until May 2024. At that visit the dealer performed the TCM reprogramming in Service Bulletin 16-147-24 (Forester, auto start/stop engine speed drop on restart) plus an ECM update. A later visit added another ECM update. A dealer has now identified yet another TCM reprogramming, quoted for a fee. The failure has persisted across all of these updates. Dealer staff acknowledge repeated customer complaints with these exact symptoms and say there is no known effective fix. Because ISS cannot be permanently disabled through any factory control, I must remember to disable it manually every drive to avoid a restart failure in traffic. The vehicle is available for inspection. This is an ongoing, unresolved safety defect that repeated manufacturer software remedies have failed to correct, and it can leave the vehicle disabled in live traffic.

ELECTRICAL SYSTEM — Filed 10/24/2025

Persistent Battery Drain on a 2021 Subaru Forester Limited. Problems began in year 4 of ownership (~17,000 mileage), after Subaru Starlink Subscription services expired. Red (Error) Starlink SOS indicator light was evident, where a normal light would show green. Battery would fully drain after about 3-4 days of inactivity while parked in a commercial garage. After repeated dead batteries, a jump-starter battery pack was used regularly, as well as a wall-outlet battery charger. The problem has not resolved with a new and appropriately specified AGM battery, replaced in December 2025. The only solution is to pull the engine-bay fuse #5, which disables the Data Communication Module (DCM), as well as other features (hands-free microphones and audio system). By pulling the fuse #5 consistently, the problem has ceased, even after a two-week period of no use. This provides irrefutable evidence that the DCM powered by fuse #5 is the source of the battery drain. The only resolution Subaru would offer was to insist on a dedicated diagnostic visit to a dealership, with the associated costs of hundreds of dollars to be borne by me, the customer, without a clear understanding of the costs or remedies to resolve this problem. I feel unsafe driving my vehicle for more than short trips given the risk of stranding or further electrical malfunctions that would impact critical vehicle functions or safety systems.

UNKNOWN OR OTHER,ENGINE,FUEL/PROPULSION SYSTEM — Filed 04/05/2026

While driving this car on April 4, 2026 at around 6PM, I experienced the distinct smell of gasoline. I had driven for about 5 minutes on our way to a local restaurant that is approximately an 8 minute drive from our residence. My wife said that she had just filled the gas tank that afternoon. After arriving at the restaurant, I checked the gas cap to ensure it was tightly sealed. I also checked to ensure no fuel was leaking from the car. After finishing dinner, we I drove the car back to my residence and once again, 5 minutes into the drive, I smelled gasoline. After we arrived home, I check the vehicle exterior for leaks and found no liquids under the car. The following day, April 5, 2026 at approximately 1115 AM, having once again found no liquids or gasoline under my car, I drove the car to my local repair shop; an 8 minute drive. About 5 minutes into the drive, I smelled gasoline again. I parked the car at the repair shop, but while adjusting the parking to fit better between the painted lines, I saw and heard a large puff of smoke from the hood area. I immediately put the car into Park, shut off the engine and ran from the car. After exiting, I saw that the car ignited with visible fire under the engine compartment. I called 911 to request fire department help. No damage to any structures or other cars occurred. Q1 Above: No the car is totaled and unavailable for inspection as far as I know. Q2 Above: I had to run from a burning car. Q3 Above: No. Q4 Above: Yes, the car was inspected by my insurance company, USAA. Q5 Above: No, there were no warning lights or any indictor that there was trouble. I would like to note that the car was brought in to my Subaru dealership service station (Hyman Brothers in Midlothian, VA) for a heater element safety recall several months ago.

POWER TRAIN,ENGINE — Filed 03/04/2026

The contact owned a 2021 Subaru Forester. The contact stated that while driving at approximately 4 MPH and slowing to park, the vehicle accelerated on its own. The contact stated that the vehicle drove out of the parking lot and crashed into a wall. The contact stated that the air bags deployed and that the vehicle had then shifted into reverse (R) and driven out away from the wall and crashed into a parked vehicle and stopped. The contact stated she was unaware of any warning lights. The contact stated that she had 1 passenger in the front seat and 2 passengers in the rear seat. The contact stated that everyone was shaken and achy, but no cuts or other injuries. The contact stated later that the passengers went on their own to seek medical attention. The contact stated that the passenger front bumper, hood, and wheel well were damaged, and the rear bumper on the passenger side had damage from the crash with the parked vehicle. The contact stated that the other vehicle had minor damage to the right rear quarter panel. The police were called and issued a report. The vehicle was towed to a collision repair shop, but had not been repaired. The vehicle had not been diagnosed for the independent acceleration and reverse failures. The contact stated that her insurance provider had not yet declared the vehicle a total loss. The manufacturer was not informed of the failure. The failure mileage was approximately 30,000.

ELECTRICAL SYSTEM,UNKNOWN OR OTHER,FORWARD COLLISION AVOIDANCE — Filed 08/11/2025

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.

AIR BAGS — Filed 12/18/2024

See attached document for complaint.

STEERING,LANE DEPARTURE — Filed 07/10/2025

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.

VEHICLE SPEED CONTROL — Filed 03/24/2025

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.

ELECTRICAL SYSTEM,UNKNOWN OR OTHER,SERVICE BRAKES — Filed 11/25/2024

1. The car shut off several times, with the steering wheel locking up and becoming stiff, the brakes failing to respond, and loud, erratic sounds emanating from the vehicle. The car is available for inspection. 2. Yes, the car crashed resulting in damage to the car, driver, and other driver (e.g. car in front). 3. This is the second time the car has been brought to the dealership (the second time being Subaru South Hill in Pennsylvania) and they cannot identify the problem. 4. The vehicle was not inspected by police, or insurance, as far as I am aware. 5. There were no warning signs before the failure.

UNKNOWN OR OTHER — Filed 04/30/2024

To whom this may concern, My name is [XXX] . I was the owner of a 2021 Subaru Forester. I bought this car brand new and I loved this car. One of the biggest reasons I bought a Subaru is because of the multiple safety features the car has. I've had this car for three years and always felt safe until last week. During a road trip on [XXX] at [XXX] My car hit a deer on the front drivers side and within seconds caught on fire. The entire car was engulfed in flames within 3 minutes. All passengers were unharmed and we were able to get 95% of our stuff out of the car. This experience was pretty traumatic knowing that I was supposed to be driving the safest car in America and it caught on fire very easily from a baby deer hit. Not only did my car catch on fire but it left us stranded in the middle of Utah. Thank god it was in a big enough town that had a car rental. Insurance is still assessing my car and I'm currently in the market for a new car but with everything that happened it makes me feel very uneasy about getting another Subaru. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE,FUEL/PROPULSION SYSTEM — Filed 11/06/2023

Vehicle was parked and idling unoccupied for under 5 minutes when an extremely noxious, hot blast of fumes came from underneath the back. Black smoke immediately entered the passenger cabin through the vents and flames were visible in the engine compartment and running onto the ground. Entire vehicle was burned beyond recognition in a matter of minutes. Ten days earlier the TCV, a known problem, had been replaced at a dealership per TSB 09-80-21. The vehicle had been driven under 300 miles since the replacement. Afterwards, a manufacturer rep inspected the vehicle, indicated the fire started in right rear of the engine compartment, could have possibly been a fuel leak, but damage was too extensive to determine the exact cause. The referenced TSB explicitly requires a new fuel line for every TCV replacement.

POWER TRAIN,VEHICLE SPEED CONTROL,ENGINE — Filed 02/12/2024

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.

VEHICLE SPEED CONTROL — Filed 05/30/2023

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.

POWER TRAIN — Filed 12/23/2022

The contact owns a 2021 Subaru Forester. The contact stated while shifting the vehicle into the drive gear, the vehicle accelerated at high speed without any warning and drove into the wall of her garage causing front damage to the vehicle. The contact stated that the vehicle hesitated to turn off. No one was injured. The vehicle was not diagnosed. The dealer was not contacted. The manufacturer was not notified of the failure. The failure mileage was 8,000.

POWER TRAIN,SERVICE BRAKES — Filed 12/08/2022

The contact owns a 2021 Subaru Forester. The contact stated while depressing the brake pedal and attempting to park in the driveway, the vehicle excessively independently accelerated in speed. The brake pedal failed to stop the vehicle and the vehicle was shifted into Park in order to come to a stop. The vehicle caused damage to the door and garage. There were no injuries reported. The vehicle was not diagnosed. The dealer was contacted, and they stated they were not aware of any recalls or complaints for the failure. The manufacturer was not contacted. The failure mileage was 10,000.

UNKNOWN OR OTHER — Filed 11/02/2022

I purchased a 2021 Subaru Forester with approximately 9000 miles on the odometer. Purchase was made on October 18, 2022, then on October 19, 2022 I experienced unintended acceleration on my way home that day with the car. The car just seemed to have a mind of its own and just "took off" at high speed and quickly it returned to normal. I simply thought I did something wrong and kept driving the car. Then on November 2, 2022 while in my driveway, the unintended acceleration happened again and this time the car hit a building on our property and both the building and the car suffered severe damage.

POWER TRAIN — Filed 08/17/2022

Car was parked on driveway (6 degree slope to rear) Car was placed in park Driver exited car to go into house when she came out car had rolled down the driveway to hit another car parked across street rear facing bot cars had rear damage. The same thing happened to the car one week later when parked in the garage placed in park but started to roll back. Was able to stop it because I was still in the car I use the parking brake now all the time

VEHICLE SPEED CONTROL — Filed 08/10/2022

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.

VEHICLE SPEED CONTROL,SERVICE BRAKES,ENGINE — Filed 07/09/2022

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.

AIR BAGS,VEHICLE SPEED CONTROL,FUEL/PROPULSION SYSTEM — Filed 05/29/2022

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

ENGINE — Filed 06/12/2022

The contact owned a 2021 Subaru Forester Sport. The contact stated while driving at 75 MPH, the front end of the vehicle crashed into a small deer. The air bags did not deploy. The contact veered to the side of the road. The contact's friend who was occupying the front passenger seat exited the vehicle and inspected the front end of the vehicle. The contact's friend then advised her to immediately exit the vehicle as there were flames underneath the hood of the vehicle. The contact stated while she was exiting the vehicle and letting her three dogs who were occupying the rear seats out of the vehicle, the fire expanded to the entire front end of the vehicle. The contact stated that the vehicle burned significantly. The contact was able to extinguish the fire with the assistance of the fire department. A fire department report was filed. A police report was filed. The vehicle was towed to an independent mechanic, where it was totaled. The contact sustained a soreness on the right knee but did not seek medical assistance. The dealer was notified of the failure but did not provide any assistance. The manufacturer was not notified of the failure. The failure mileage was approximately 20,000. The VIN was unavailable.