2019 Subaru Forester: false forward collision warnings

Filed Nov 21, 2025 · Driver assistance · FL

The contact owns a 2019 Subaru Forester. The contact stated that while driving approximately 70 MPH, the Forward Collision Avoidance system activated, and the vehicle immediately decelerated to 56 MPH. The failure was intermittent but had occurred several times over 5 years. The contact had to manually turn off the Forward Collision Avoidance system to avoid the failure. The vehicle was taken to the dealer, who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was unknown.

Filed Mar 31, 2025 · Driver assistance, Seats · IL

1) The seat is cracking on the drivers seat. The vehicle only has 64,000 miles on it. No word from Subaru. 2) Parking collision warning system works part of the time. Dangerous when the system does not detect a person or vehicle in the blind spot.

Filed Jun 5, 2024 · Electrical, Engine · MI

I have had multiple issues with my car for the past month. First, my rear right wheel has been making a fan-like sound when going above 35mph and it gets louder until 70mph. It is most likely the wheel bearings going out but, I only have around 50,000 miles on the car. This seems to be a common issue with Foresters. Secondly, my rear Harman Kardon speakers have stopped working. This also appears to be a recurring issue with Forester's, with both their standard and premium sound systems. Lastly, my engine check light turned on and shut off my adaptive cruise control, forward collision warning, emergency braking, and rear automatic braking. I'm surprised that these issues are still happening to Subaru since they have been complained about by consumers for years.

Filed Apr 24, 2024 · Acceleration, Airbags · 34,000 miles · GA · crash · 1 injury

The contact owned a 2019 Subaru Forester. The contact stated while parking the vehicle, the vehicle suddenly accelerated to approximately 80 MPH unintendedly. The contact stated that she depressed the brake pedal, but the vehicle failed to respond. There was no warning light illuminated. The contact stated that the vehicle spun several times, causing her to lose control of the vehicle. The contact stated that the vehicle hit several power generator boxes while spinning. The vehicle then turned around and drove across the street unintendedly, and the front end of the vehicle crashed into a pine tree. The contact stated that the forward collision avoidance failed to engage. The air bags failed to deploy. The neighbors assisted the contact out of the vehicle. The contact stated that she was shocked and was assisted in a chair. The contact that she later felt pain all over the body and was taken to the hospital, where she was informed that she had sustained a broken sternum, bruises, and pain all over the body. The insurance company towed the vehicle to a tow lot, where it was totaled. The dealer was notified of the failure. The manufacturer was notified of the failure and sent a field engineer who retrieved the EDR from the vehicle. The manufacturer later informed the contact that the information retrieved from the EDR indicated that there was no vehicle malfunction and that the air bags had not deployed because the impact was not significant. The failure mileage was approximately 34,000.

Filed Mar 2, 2024 · Engine, Transmission · MA

While driving on a highway outside Milford, CT my vehicle is check engine light suddenly illuminated. I had a sudden loss of power, no heat, and the engine temperature was unable to read. Engine temperature was not accurately reporting and showed it as being cold as indicated by blue light warmup light. My eyesight, pre-collision system, and sport mode was disabled due to the engine light being illuminated. The vehicle was seen at a Subaru dealer, who diagnosed the issue to be the thermo control valve. Dealership informed me that it was unsafe to drive and I risk complete engine failure, overheating, and or fire if I continue to operate without required repair. As a result, I was stranded overnight, three hours away from home. Repair was completed on [XXX] at cost of $1830. I learned at the dealership that this is a known issue, in 2021 Subaru replace the plastic components of this part with aluminum due to similar issues experience by many customers. Customers are reporting vehicles going into “limp mode” and even engine damage. I learn that there is a class action lawsuit regarding the same issue, which can be reviewed here: [XXX] Please help to recall vehicles and push Subaru to repair/refund. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 6, 2023 · Electrical, Transmission · WA

Defective/failed thermal control valve. Valve failed while I was driving, resulting in safety systems (e.g., lane keep assist, pre-collision braking). Looking this up, this is a known issue to Subaru.

Filed Nov 3, 2023 · Driver assistance, Engine · NY

The check engine light came on and all of the eyesight components on the car were disabled as I was traveling down the highway at 70 mph (this included the adaptive cruise control, the lane departure warning, forward collision warning, etc). In addition, the engine thermostat light came on and the heater and defroster stopped working. It was cold and rainy and the window started to fog up and I was unable to clear it without a functioning defroster. This was definitely a safety issue and I had to stop driving. The car was taken to a subaru dealer today and diagnosed with faulty thermo control valve. The technician told me the car should NOT be driven in this condition due to the problem being in the engine coolant system. This is a known issue on the 2019 Forester, and other Subaru models as well, and has a TSB originally issued in Sept 2021. (#09-80-21) My car has 70K miles and therefore is just out of the warranty period. I will have to pay over $1500 to replace this part and because it is a safety issue I have no choice but to pay for the repair. It is a part that is known to be defective and I am requesting that a recall should be issued before others are also put in potential danger and/or forced to pay large sums of money to get it fixed.

Filed Oct 6, 2023 · Driver assistance, Engine · VA

4 days ago my Check Engine light came on. In my car, when this happens, it disables all Eyesight features - collision warning, lane departure warning, etc. Work hours being what they are, I drove home that night and back to work the next day with it on. I managed to get it scanned when it popped a code for the Coolant Bypass Valve. Searching that code online lead me to DOZENS AND DOZENS of forums, posts, stories of the same code popping up on other 2019-2020 Subaru's. They all had to take it in for a hefty repair. It also led me to a Service Bulletin issued last year, which showed that Subaru had rebuilt the TCV so it could withstand corrosion, unlike the previous version. So naturally I took it into my local dealership to have it looked at, and sure enough - the TCV needed to be replaced. WHY HASN"T THIS PART BEEN RECALLED YET??? Given there is no thermostat on my cars dash, I would have no clue whether my car was overheating due to this faulty valve, until its too late. It seems like this is a big potential safety issue that Subaru needs to address, and someone needs to force their hand.

Filed Jul 23, 2023 · Driver assistance · VA

As a result of code P26A3 (engine coolant bypass valve), the cars Eye Sight system is turned off as well as lane departure, reverse automatic braking, and pre-collision braking system. While code P26A3 may in fact refer to a serious problem with then engine, there is no reason why a safety system should be shut off!

Filed Jul 11, 2023 · Driver assistance, Engine · NY

I am writing to report a safety issue with my 2019 Subaru Forester, which I believe may affect many other Subaru vehicles as well. Specifically, I have experienced a problem with the thermo control valve, which has caused the EyeSight safety features to be disabled and potentially poses a safety risk. I first became aware of this issue when the EyeSight safety features on my vehicle were automatically disabled due to a malfunction. I brought my vehicle to a Subaru dealership for an inspection, and they determined that the thermo control valve was faulty and needed to be replaced. It was alarming to learn that many other Subaru owners had experienced the same issue, and some had even experienced engine failure as a result. The EyeSight system is a driver assistance technology developed by Subaru that uses cameras and sensors to monitor the road and surrounding environment, alerting drivers to potential hazards and providing automatic braking support if necessary. This technology has been recognized as one of the most advanced driver assistance technologies available, and is designed to help prevent accidents and reduce the severity of collisions. The EyeSight system includes features such as adaptive cruise control, pre-collision braking, lane departure warning, and sway warning, which work together to provide a comprehensive safety package for drivers and passengers. These features are critical in keeping drivers safe. I am concerned that this issue may be more widespread than initially thought, and that it may pose a safety risk to drivers and passengers of affected Subaru vehicles. The faulty thermo control valve can cause the EyeSight safety features to be disabled, which can lead to reduced safety performance, accidents, and potentially harm to drivers and passengers. Sincerely, Davide Alves

Filed Jun 23, 2023 · Driver assistance, Transmission · MO

Was driving in the right-hand lane on the interstate with the cruise control set, went to change lanes as I was approaching a slower moving semi truck going up an incline. Cruise control deactivated with no inputs from myself. Vehicle began to decelerate. Looked at instrument cluster, the Check Engine Light was on along with Eye Sight Off symbol. Additional symbols for forward collision avoidance and rear active braking were also on. No warning signs were present prior to the cruise control turning off. The unexpected loss of power increases the risk of collision while traveling on the highway. Vehicle was taken a Subaru dealer, diagnosed with code P2682, Coolant Bypass valve performance, with a recommendation to replace the coolant bypass valve.

Filed Aug 10, 2022 · Driver assistance, Electrical · ND

I recently bought this vehicle (used) with ~1900 miles. After 1.5 months of owning the vehicle, I suddenly had several warning lights as well as systems disabled within the vehicle. The first time this occurred I was about 2 hours into a drive, and suddenly my eyesight disabled, check engine light came on, cruise control disabled, lane departure disabled, collision warning and automatic braking disabled. After pulling over to inspect, I also realized my trunk would no longer open. I took it to a dealership who said it was due to low battery voltage—despite there being no spectacular incidents to drain the battery since I purchased the vehicle. They recharged the battery and the problem was temporarily fixed. However, once I retrieved my vehicle from the dealership the check engine light and disabled features were still prevalent. I once again had them recharge the battery—despite there again being no events causing the battery to drain—to which the problem was solved. Again, about an hour into my drive back home, the check engine light and features suddenly disabled. This is detrimental to my safety as a driver—as every safety feature suddenly disables without warning during my drive.