Assist problems of the 2020 Subaru Forester

I was stopped at a red light and the engine stalled. It read "for safety, auto restart disabled". All warning lights on the dashboard lit up. I had to put the car in park and restart it in order to drive. I was honked at and put in a dangerous position. This has happened at least twice now.

I was driving to work and many of my warning lights suddenly came on. This includes my check engine light, my lane assist light, my auto collision braking, my eye sight disabled and my cool engine light keeps going on and off. My cabin heating also isn’t working. There is no reason for this happening other than my thermo control valve failing.

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.

Error code (p26a3?)for - engine coolant bypass valve. Causes the "check engine" light to come on and automatically disables all of the safety and collision mitigation systems. The engine coolant bypass valve failure is common and a known issue and Subaru has already updated the part on newer vehicle models. The common failure of the coolant bypass valve should not be disabling the safety features and the collision avoidance systems.

Battery dead not even 2 years old. Known problem they won't fix. Lane assist was pulling us into other traffic lanes when wasn't supposed to almost causing accidents and now won't turn on.

I drive this v little, but the steering wheel has repeatedly tried to jerk me into the left lane when tuning right and right when turning left! I stopped using cruise, but it still does it. I am an advanced driver, but don't low, if I could overcome this if it acted like some other 2020 Foresters I've read owners state have gone off the road and rolled over! also the auto stop - start often shuts engine off when power is needed - is totally unpredictable! this is my wife's car, but she got it as the seat works with my v bad back! had I known the eyesight system would malfunction (I did not trust it, but hoped it would be ok!), I'd have insisted on getting a good older car without unproven so called driver aids! we really don't have the $ to replace the car!.

Lane keep assist feature the lane keep assist feature seems, in general, to over steer causing sway back and forth across the lane. While I find this bothersome, most recently, at highway speed, the lane keep assist pulled the car (suddenly and somewhat violently) onto an exit ramp rather than holding the right lane. No one was hurt. No damage occurred. I was able to yank the wheel back to the lane with the entire incident over in less and a second. Safety at risk? highway speed with unanticipated veer of intended path. It was good that traffic was quite light. I have not reported this to the dealer. No special warnings other than that the system "worked".