2019 Subaru Forester Engine Problems

Engine lost power and was misfiring while many warning symbols appeared on the dash. There was a divider separating the lanes. The car coasted to almost to a stop, but the engine chugged enough to slowly turn left at the first opening in the divider and just barely made it off the main road. The engine stopped. I restarted it several times. The engine was misfiring barely running. The electric brake was applied on its own. The car did not respond to moving the shift selector out of park, so the car was immobilized. I put the 4-way flashers on and called AAA. There seemed to be no way for me to move it out of park or release the electronic parking brake. AAA could not respond quickly and suggested I call the police to divert traffic around my car for safety which I did. The tow truck operator was able to disengage the wheels and was able to flatbed it to the nearest repair shop. This being Saturday 1/3/26 it wasn't until Tuesday the repair shop determined the car would not run long enough to provide a reliable diagnosis due to the multiple trouble codes coming up on the computer analysis. I had the car towed to the nearest Subaru dealership who replaced the thermos control valve under their warranty extension. The dealership said usually when this part fails it just triggers a check engine light and not the dangerous situation I experienced. I believe a recall to replace this part should be issued on all cars with this defective part as its failure can cause a dangerous situation without warning.

The contact owns a 2019 Subaru Forester. The contact stated that after starting the vehicle, there was white smoke coming from the exhaust pipes. The vehicle was towed to the local dealer who diagnosed that the engine PCV had failed, causing catastrophic damage to the engine. The contact was advised that the engine needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure and informed that the vehicle was previously serviced under NHTSA Campaign Number: 19V856000 (ENGINE AND ENGINE COOLING); and the engine was replaced as part of the recall repair. The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 122,000.

My car is a 2019 suaru forester 54,268mi I was driving from Houston to Dallas on the freeway during a thunderstorm on [XXX] [XXX]. I got off the freeway and was almost on the road near my house when my car engine suddenly died, I had no control of my car, my car engine would not start anymore. I had no problems with my car before. I towed it home the next day and had it checked with a scanner and it came up with about 25 check engine codes. 5/14/2025 Subaru dealer (ewing of plano) had it checked and had the thermo control valve replaced because it was bad. They had no previous notices or recalls. If my car had stopped in the middle of the freeway it could have been a major accident..other people's lives are important..please look into this issue INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Auto start/stop shut off engine at drive thru line. Locked up brakes and could not get it to unlock and restart car. It has happened on a number of occasions. After multiple attempts trying and letting it sit for a couple of hours, somehow got it to unlock and start. Thank goodness we haven’t gotten into an accident

When I first noticed that my car wasn’t heating properly, it was in May 20 24 when I purchased the car and Carvana dropped it off to my place of residency. When I notified someone of this issue, they told me it probably just needed coolant. I did as instructed and noticed that I was adding in coolant frequently. On February 19, 2025 I returned home one evening and noticed that smoke coming from my car and coolant was leaking from underneath. I called roadside assistance in order to get my car towed and into service at the Subaru dealership. After inspection, the mechanic noticed that there was oil inside the coolant suggesting that there may be an issue with the head gaskets then warned me not to drive my car because there could be further issue with the engine as a result of the head gasket being blown.

When I break and stop the car power is reduced, at times it stalls out and be hard to start again when starting back up in traffic. This is also starting to happen in my other Forrester of the same year.

At a stop light, auto stop engaged. When foot put on gas, engine died and every warning light the car has appeared on the dash board. It took several tries, but I did get the car started again. Took to dealer who confirmed the incident and replaced the starter at 38, 126 miles. The fuel pump relay was also replaced. After this incident, the cancel auto stop/start button was used most of the time when driving the car. 10 months later, forgetting to engage the cancel button, and the auto stop/start working, the car once again died at an intersection. We were able to get it restarted and it went back to the dealer. They again confirmed that the starter was faulty and once again replaced it and the fuel pump relay. This occurred at 44,770 miles. Thankfully, In both incidents, we were stopped at intersections with traffic lights. The first was in a left turn lane surrounded by cars on a hill. I was able to engage the parking brake before I rolled back into anyone. The second incident was at a flat intersection. Others were stopped around us and no one was approaching us with speed. My concern is that this will occur when waiting to make a left turn at an intersection and the car would roll forward into traffic. Another concern is if highway traffic is stopped and then starts moving again. If the car stalls and won't restart, traffic around you would go forward and traffic behind them would approach your stalled car at speed. Someone is going to be killed from this problem if they haven't been already.

While driving, the engine stalled and many dash lights came on. The thermo control valve was the cause. There was no warning and fortunately I was able to park off of the roadway. The car was towed to the nearest Subaru dealership at a cost of $223.00. The car was repaired under the extended warranty, but I am out the towing fee. Had the defective part been recalled, I would not have experienced this engine failure.

On [XXX], while driving back home in the evening, the car started to make noises, that became quite loud very fast. I was able to drive to my home, less than 3 miles away, but I could not restart the car anymore. No warning lights were on. It was around [XXX] pm and I was afraid of what might have happened it the car became disabled. The next morning, the car was towed to the MileOne Herb Gordon Subaru Dealer in Silver Spring, MD. I was informed that the rod crankshaft bearing had failed. The engine short block had to be replaced. It is unbelievable to me that a car that had less than 58,000 miles and have been properly maintained will have such a catastrophic failure. The cost to fix this failure: $10676.39 since it is out of warranty for time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My SUBARU has a Start-Stop feature which automatically stops and restarts the engine when the vehicle is stationary for a short time, such as at a stop sign or red light. Several times within the last month I was stopped for a light or stop sign and the vehicle shut down completely. Engine turned off. I have attached a file showing the display on the dash. This was very unsafe as cars behind me were getting impatient while I had to figure out how to restart the car. It was very scary. After researching the problem online and taking the car to my mechanic it turns out that the battery was low. The battery was replaced and auto restart is working correctly now. It seems that with all the warning messages that are displayed (windshield washer fluid is low) that some indicator that the battery is low should display rather than this unsafe scenario.

The contact owns a 2019 Subaru Forester. The contact stated while driving 55 MPH, the vehicle started hesitating while depressing the accelerator pedal with the check engine warning light illuminated. The contact activated the hazard lights and coasted the vehicle off to the shoulder. Due to the failure, the vehicle was towed to a local dealer where the vehicle was diagnosed with a defective thermal control valve. The contact was informed that the thermal valve was covered under an Extended Warranty by the manufacturer. The manufacturer was notified of the failure and a case was filed. The vehicle was repaired. The failure mileage was approximately 30,000.

The auto stop/start function is erratic. Many times the function fails to start the car after a stop. The car stalls. It requires car to put in park and have to restart the car. This causes delay for traffic to move. When this happens, it creates a safety issue. The car behind may start to move and cause accident because the rest of the traffic has started to move. Sometimes the car driver behind you honks the horn as the rest of the traffic starts to move. The 2019 Subaru Forester has only 31000 miles. This has been happening once a week since June 2023. It is becoming a safety concern for me. This started to happen around 25000 miles on the car.

The contact owns a 2019 Subaru Forester. The contact stated that while his son was driving at approximately 60 MPH, the check engine warning light illuminated. The contact's son stated that the vehicle was emitting smoke from the exhaust pipe. The contact stated that his son pulled off the highway and stopped the vehicle and had the vehicle towed to the dealer. The dealer diagnosed the vehicle and determined that the positive crankcase ventilation valve (PCV) had separated and needed to be replaced. The vehicle was not repaired. The contact was advised by the dealer that the failure was related to NHTSA Campaign Number: 19V856000 (Engine and Engine Cooling) which was already completed on the vehicle. The manufacturer was informed of the failure. The failure mileage was approximately 130,000.

Engine failed without warning while driving on a busy highway on 4/20/2024. The engine suddenly stopped and tried to automatically restart itself only to immediately shut down, simultaneously dashboard lit up with multiple warning lights ( eyesight disabled, check engine light, RAB off, brake light etc). No power to the car with inability to accelerate. My husband driving the vehicle was able to maneuver the car over 2 lanes in heavy traffic to the rumble strip between 4 lane highway and a 2 lane acceleration entrance ramp. We came within seconds of being hit which could have been a very serious accident. Since the car had no power we weren't even able to get to the right shoulder. We had to sit in the vehicle over 2 1/2 hours waiting for a tow surrounded by high speed traffic on both sides. The cause of engine failure was a defective Thermo Control Valve, diagnostic code P26A6. Subaru recently issued an extended warranty in April for the TCV which is present in many of its vehicles. It should be a RECALL and not just an extension of the warranty since failure can be quite serious resulting in the engine completely shutting down. We had NO previous warning that the car was at risk for unexpected stopping. Car is well maintained with only 34,608 miles (2019 model) and had been in the shop the DAY before the incident getting routine car service. The service manager knew what the problem was by description before even performing the necessary interrogation for diagnostic codes. He was able to get the vehicle to start and drive it into the dealer repair shop by simply removing the TCV before starting. We were the 3rd vehicle in that day for replacement of TCV. He stated they replace 5-10 a week although most present with a check engine light and some with other warnings such as eyesight disabled. The factory original TCV has been replaced with a reportedly revised TCV. Risk of engine failure without warning as result of faulty TCV is putting lives at risk.

See attached document for complaint

The check engine light went on and the diagnostic code read was P26A3, Engine Coolant Bypass Valve is failing in my 2019 Forester, which only has 46,000 miles on it. Subaru was aware that this part was defective in the 2019-2021 models, because in Feb of 2022 the part was replaced and a service bulletin 09-80-21 was issued with instruction for replacing the part, but did not issue a recall, despite this problem causing the advanced safety features to stop working and directly affecting the proper functioning of the engine. My car is just out of warranty, and the quote to have my mechanic replace the part is almost $1200 which I am unable to afford and do not feel I should have to pay for. Subaru should be help to account for this issue.

Thermo control valve failure, P26A3 code, eyesight safety assistance warning light ,check engine light, pre collision braking light, lane assist light.

Check engine light came on roughly 3 days prior to incident. Temperature control/coolant bypass valve failed (replaced by dealer at my expense with now updated design), caused the car to unexpectedly lose power rapidly and enter limp mode, dropping from 55 MPH down to 5 MPH in seconds. The incident occurred on a rural road. I had been on an interstate during rush hour roughly 15 minutes prior and could have caused a crash if the incident happened there.

The contact owns a 2019 Subaru Forester. The contact stated while driving at an undisclosed speed, several unknown warning lights illuminated. The contact stated that the audible alert sounds were excessively loud and the warning lights were so bright that the contact became frantic. The contact stopped at a local Auto Zone. The Auto Zone mechanic inspected the vehicle and informed the contact that the failure was due to a failed heater control valve. The vehicle was taken to the dealer where it was diagnosed with a failed heater control module, and it was determined that the heater control valve needed to be replaced. The vehicle was repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 79,128.

I started my vehicle and the check engine light came on. In addition, my eye sight turned off and the letter S started blinking. I also had clicking noises when I turned the vehicle off. I read some forums and this is a thermo control valve problem that happens to many Subarus in 2019-2021 range. As I took the vehicle to check the codes, the heater did not work and the cold engine light kept coming on. The codes read P26A3. Other reports are: NHTSA 11490232; 12479843; 11511658; 11490977; 11479843; and many others. Apparently Subaru is aware this valve and has come out with a new replacement that costs a high dollar amount to change out.