2020 Subaru Forester Transmission Problems

Check engine, forward collision warning, flashing "s"drive, no eyesight, automatic emergency braking warning lights, all came on at once and staying on. Possible thermo control valve issue - needs a recall!

While driving temperature light, check engine light, all ADAS lights came on as inoperable (cameras, warning, ABS, BSD/RCTA), no heat (including defrost) available to defrost or for cabin. Appointment 3/13 replaced thermo control valve assembly , coolant bypass valve, intake gaskets, fuel line, coolant, total charges $2070. Luckily had extended warranty I bought, that I had to make a claim on.

The thermo control valve on vehicle failed on 2020 Subaru Forester which is causing vehicle to loose acceleration, multiple errors codes displaying on the vehicle instrument dash panel and no heat in the vehicle (see attached photo for reference). The failure of this device could cause a vehicle fire depending on what position/ and or state the thermo valve failed in.

While accelerating to merge in the freeway the Thermo Control Valve malfunctioned, causing check engine light to come on which turned off all the safety features (lane assist off, precollision off, RAB and eyesight off) of my Subaru 2020 Forester Sport. I’ve researched the internet and shows it is a common issue. I brought it to a subaru dealership and was told it is not safe to drive the vehicle.

The thermo control valve (TCV) went bad at 54,000 miles. The result is that none of the safety features work anymore. Collision detection, Eye-Sight, lane change warnings, anti-skid, etc.

The Thermo Control Valve failed at 33,945 miles. Because of this, the heater, Eye Sight, Cruise Control, Lane Assist, and Collision Brake did not work. The engine was then only running at "Sport" mode.

41k miles P26A3 P26A5 ****Eyesight disabled*** ***Forward collision disabled *** Failed TCV and dealer will not cover because warranty period is over.

While driving, the 2020 Forester, the check engine light, collision light, eyesight function lights all went on at the same time. I brought vehicle to check diagnostics and it is showing Engine Coolant Bypass Valve "A" Control Circuit low in Power Train System.

Our thermo control valve (TCV) assembly failed and caused dangerous loss of speed and control while on the highway. Subaru is fully aware of the defect in their design as they issued a service bulletin to inform their service centers of a new, fixed TCV assembly that is retaining the same part number (a notice only sent to their service centers, NOT to owners). Please see attached.

While driving the vehicle suddenly stalled and stopped running. The dashboard illuminated with most lights and the check engine message came on the screen. I was thankfully able to get into the shoulder on the road safely without creating an accident or getting injured.

When climbing shallow hills, car will buck and surge. Engine RPM seemed to stay constant. The transmission seemed to be unable to decide on which gear it should be in.

The other day, the check engine light came on & Eyesight was disabled. I take it to the nearest mechanic who tells me that the cooling fans are running too long at idle & this could drain the battery. He also tells me to watch for the engine overheating.

Subaru of America is aware of the problem which impacts several models and model years, see Subaru Service Bulletin 16-132-20R. Transmission slippage and bounce feel during acceleration. Can be strong enough at times to visually see occupants moving with momentum/bounce at times.

2020 subaru forester just had a check engine light appear. The engine malfunction code is p26a3, which is a defective thermostatic control valve. This malfunction also affects the vehicle manufacturers advanced driver assitance systems such as: "eyesight" blind spot monitoring, lane keep assist, etc.

I purchased a 2020 Subaru Forester in 2020. Last week, the Check Engine light came on and it was due to the thermo control valve that need replaced. My car was outside of warranty at 70k miles and Subaru’s customer advocacy office will not reimburse despite this being a faulty defect for many 2018-21 Foresters.

Thermo control sensor failed which will damage the motor if overheating dealer says it's going to cost me $1500 and it isn't covered under drivetrain warranty which is 5 years 60000 miles I have 27000 miles

The thermo control valve failed causing the coolant to run at full and not allowing the engine to reach proper temperature and the heating system to not provide heat, also it caused multiple safety systems to turn off including eye sight, emergency braking, rear auto brake, lane keeping, adaptive cruise control, traction control.

Engine check light came on and after running a test it seemed as though the thermo control valve thermostat was not working properly which means the valve that lets coolant into the engine doesn't know what the temp is and when to release coolant.

The thermo control valve malfunctioned causing the check engine light to come on which shut down all the safety features in the vehicle including the front eye sight camera, blind spot warning, the rear automatic braking, lane departure warning, adaptive cruise control, and lane keeping assistance.

I was driving on a paved two lane rural route and hit a small bump in the road. Immediately, my check engine light came on and all the safety features turned off. Control panel showed multiple safety features off and the Sport mode indicator light blinking.

The thermo-valve controller gives out on this vehicle. Through searches and discussions with two separate dealerships, this seems to be an incredibly common issue. It's enough that Subaru has actually completely replaced the design of this piece for whenever it gets replaced.

At the time,time, car was not fully 2 years old.. its brand new.This is an addition to a post created a week ago. After the dealership offered to detail the interior of the car to solve the sulferic acid feeling I noticed that the flap above the driving wheel started to feel warm.

Tl* the contact owns a 2020 subaru forester. The contact stated that while driving and approaching a stop, the vehicle independently accelerated and vibrated for approximately 3 seconds before returning to normal operation. There was no warning light illuminated.

Thermo control valve is bad. Ask subaru to issue recall on 2019-2020 models.

Got warning P2A63 that the Thermo Control Valve is shot around 63k miles. Apparently this is happening very often in Subaru's made between 2019 and 2022.

Thermo control valve stays open. Needs replacement. Automatic brakes have gone on with no car in front of vehicle.

Ever since we purchased our Subaru, the RPM's seemed a little off and then at random times when I put it in reverse, it will just idle and I will slowly press on the accelerator and it will not engage in reverse and then random pop into gear and lunge backwards. It doesn't happen every time, but is scary when it does. This has been happening pretty much since we purchased it

Vehicle was stationary. Foot on brake in parking spot. Then vehicle accelerated on its own.