2020 Subaru Forester

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. Their were no messages prior to all the lights turning on and I was able to bring into the dealer for oil change but not able to make an appointment for repair for a few days from 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.

The check engine light illuminated and the thermo control valve failed at 3 years old. The defrost and heater stopped working immediately making visibility extremely difficult . The eyesight and automatic braking system were also disabled due to the TCV issue. My Forester mpg dropped to under 20 mpg. The Subaru dealer inspected and confirmed code P26A3 and stated the thermo control valve needs to be replaced.

Corrupted Driver Assist Software. Dashboard icons for hands on steering wheel, dynamic vehicle control, lane change control were flashing that systems were off, controls were turned off randomly. Vehicle was not tracking appropriately in its lane, steering was not acting correctly. Car at times acted as if it were being blown by a strong crosswind. Steering between lanes was not consistent. Icon warning that my hands were not on steering wheel when both my hands were on the steering wheel.

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".