Adaptive Cruise Control problems of the 2020 Subaru Forester

Within one month the same thing happened. I turn on the car and the eyesight warning light is on (eyesight feature disabled), flashing "s" drive is on, "break" light is on, and check engine light is on. Due to this cruise control isn't working. My plan was to take it to a mechanic/dealership that Monday. By Monday morning, after about 15 minutes of driving, all warning signs disappeared. This exact thing happened a few weeks later (this morning). I started googling issues and seems like this is an issue for many customers and is just a malfunctioning thermo control valve, no actual problem. What do I do about this? this is much less important - but also seems like a quality issue, at drivers side, the seat cover is starting to crack, looking like this is car is over 10 years old, we've had it for less than 4 years and this shouldn't be happening on a car of this caliber. Photos attached.

Started engine after parking and check engine light came on, eyesight disabled, and flashing “s”. Stopped driving and took vehicle to dealer. Diagnosed as thermo control unit. Told they didn’t have a loaner and was safe to drive for a few days. Has no heat and engine would not warm up. No safety systems. Retained 3 days later to dealer when loaner was available. Repaired under powertrain warranty.

The thermal control valve stopped working. The car has <50k miles on it. The error also results in many/all of the safety systems being deactivated (no adaptive cruise control, no lane centering, no rear braking, etc. ).

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. The check engine computer readout diagnostic trouble code was p26a5 "engine coolant bypass valve "a" position sensor circuit range/performance". The vehicle was taken to a Subaru dealer who found the thermo valve performance was out of spec. This vehicle has not been recalled although the manufacturer replaced the part in 2021 vehicles acknowledging the valve was faulty. Because of the mileage on my vehicle, it was not covered under the warranty although many have been replaced under the manufacturer's warranty due to the failure of this valve under the 60,000 mile warranty. I believe this should be a recall item for others who experience this issue.

While I was traveling I stopped at a rest area and when I restarted my car, my panel lit up like a christmas tree. All my safety assist systems were disabled and my check engine light came on. When I got home I had my mechanic run the codes and it came back to the thermo control valve. This happened on 8-29-2023. I researched the problem and Subaru put out a service bulletin in February 2022 but never notified me. My car is out of warranty now and am forced to drive without my safety systems because, 1- they don’t carry the part in stock and 2- the cost to repair is over $1400. 00. Subaru was aware of the problem but kept it quiet. I feel this is a scam and Subaru should recall this part. I was warned that my car could die at any time. I bought it for those very safety systems as I am a senior citizen and rely on them now.

In April 2022 after owning the car for 4 weeks the eyesight went out. I was told it was due to the thermal control module. That was replaced. I’m n June 2023 the ac went out. They said it was the blower motor. That was replaced. In September 2023 the ac went out again. At that point they found the cause was actually a fully melted fuse box and fuses. They replaced the fusebox and the entire ac system. I have had 3 batteries in the vehicle since March 2022. In December 2024 they found that my car needed an update and the update friend the transmission controls module. Then the starter went out at the same time. After that was fixed a week later all the lights in my dash came on and there were no safety features running in the vehicle. I reach out to Subaru and I was told this was all normal wear and tear in the vehicle and it just happens. A melted fuse box and safely features just randomly dying on a 4. 5 year old car goes deeper than that. There has been almost $12000 in repaired performed on this car and the ones remaining are undiagnosed as they have never seen the codes before. This is a mush larger issue and Subaru refuses to do anything.

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. Since I just passed 60k powertrain warranty (around 62k), it is not covered and had to pay over $3,000.

When I was driving this car one night, every dash light was suddenly activated and remained on -- and as a result all safety features were deactivated. When I was able to do so, I touched the battery cables together to reboot the system. I had to do this 3 times over the course of 4 days. Realizing the problem was chronic, I took the car to the dealership (a 2 hour drive), where a service tech explained the problem 'was caused by a low battery. ' this car is only 2 years old. A new car battery should last longer than 2 years. It thus seems to me the battery was defective or the car improperly drained it somehow. More important, there is no warning that a 'low battery' -- one which can easily start a car -- could still deactivate safety features while driving.

Dtc p26a3 thermo control valve ? all my safety features are disabled until the part becomes available- it is apparently on back order and/ or not part of an active recall or both ? having difficulty getting information from my dealer/service dept.

Our windshield spontaneously cracked and the crack has grown very quickly. I looked online only to see that this has happened to several others.

Windshield developed a crack. No known even such as a debris strike was occurred. Crack was first noticed when the car was parked.