2019 SUBARU FORESTER Power Train Problems

The electrical system fails, and the battery is not charging sufficiently. When the auto start/stop engages, the car does not restart in traffic. Requested a battery test at the dealership in May 2025; was told it could not be done that day because it would require leaving the dealer service shop. Eventually, the electrical system became unstable, and the car stopped in traffic on 11/07/2025. Replaced battery following OEM specs. In February 2026, symptoms reappeared with a new battery failing on 02/15/2026, resulting in all saftey systems failing in traffic when auto start/stop enages.

While at a Stop as the engine turns off and awaits decompression of brake to turn on again vehicle moves forward bit, then the engine shuts down while in drive (stalls) had a vehicle hit me in rear but luckily I had my trailer hitch on because it saved me from body damage . I had to place in park and restart this has happened several times before and I’m kinda nervous and makes my wife nervous when stopping at lights or stop signs it might turn off in the middle of the intersection. When this occurrence happens all dash lights pop up … I checked engine with code reader after the incidents but it doesn’t give out any info on what could possibly be happening. I had the Dealership change the Thermo control module in 2025 but these occurrences has happened before and after the TCM replacement.Having the dealership...

- *Incident 1 (2023):* While driving, my vehicle suddenly stopped while in drive gear, accompanied by a high-pitched alarm and multiple engine service lights. It took over 30 seconds to shift into park and restart the vehicle. The incident occurred at an intersection, and I was fortunate to avoid any collisions. - *Incident 2 (September 2025):* The same problem recurred on two separate occasions- AFTER CERTIFIED REPAIRS. The vehicle came to a complete stop while driving uphill at a decelerated speed, and also while stopped at an intersection. In both instances, the gear was in drive, and the vehicle shut down completely, displaying engine service lights. *Previous Repairs:* - *TCV Replacement:* The Thermo Control Valve was replaced under warranty due to a faulty issue affecting the EyeSight system. - *Battery Replacement:* The battery was replaced under warranty in 2023 after the initial incident. Whats concerning is that my dealer said...

50k Mileage Mark: When the vehicle turned off at the stop light to save gas, the car stalled. I had to frequently put the car back in Park, and restart the engine. Since then, I had to turn off the “auto turn off” function for fear of the car stalling on the road. This has caused unnecessary anxiety and fear while driving, harming my psychological wellness. Since the 50k mark this has happened about 10 times. The most recent issue was this month

CVT Transmission failed and not repairable. 6 months out of warranty but under mileage for warranty at 37,000 miles. Fairly new vehicle that is useless w/o $9,000 for a replacement transmission. Exact same defect in 2018 and older models that Subaru is covering repairs and extended warranty for those years.

Subaru Transmission is wonky! Makes noise... Feels unsafe... sent to shop... they say it needs a new transmission

On April 16, 2024 the Thermo Control Valve on my 2019 Subaru Forester failed while I was going 70 mph in the middle lane of rush hour traffic. All of the warning lights came on at once as my engine stalled. I lost all mechanical power and was barely able to make it off the highway without getting hit. There was no prior warning that the Thermo Control Valve was bad. I had the car serviced at a Subaru dealership three weeks before the incident and was told that everything looked good on my car. The dealership replaced the Thermo Control Valve under extended warranty coverage. I have a second 2019 Subaru Forester that also falls in this group of vehicles, but Subaru will not replace the Thermo Control Valve until it fails.

While driving on a highway outside Milford, CT my vehicle is check engine light suddenly illuminated. I had a sudden loss of power, no heat, and the engine temperature was unable to read. Engine temperature was not accurately reporting and showed it as being cold as indicated by blue light warmup light. My eyesight, pre-collision system, and sport mode was disabled due to the engine light being illuminated. The vehicle was seen at a Subaru dealer, who diagnosed the issue to be the thermo control valve. Dealership informed me that it was unsafe to drive and I risk complete engine failure, overheating, and or fire if I continue to operate without required repair. As a result, I was stranded overnight, three hours away from home. Repair was completed on [XXX] at cost of $1830. I learned at the dealership that this is a known issue, in 2021 Subaru replace the...

Check engine light came on and gave code P26A6 which came back the thermal control valve which is a well known issue with this make and model vehicle.

Power Control Valve malfunctioning at 26,000 miles. Causing all safety features (auto braking & lane departure) to be shut off.

Defective/failed thermal control valve. Valve failed while I was driving, resulting in safety systems (e.g., lane keep assist, pre-collision braking). Looking this up, this is a known issue to Subaru.

When driving, ALL lights on the dash went on and vehicle safety features did not work- no cruise control, automatic breaking, automatic headlight adjustments, etc. We were over 500 miles from home and had the oil changed but it did not fix the problem. Had $72,000 miles on it, 4 years old. We had to drive home that distance to get it repaired over a 2-3 day period. No safety features were enabled as we drove. Thermo Control Valve was deemed faulty and replaced. Seeing after the fact that the TSB was issued without any VIN numbers: [XXX] , I believe it should include our VIN number and be recalled and the replacement paid for. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My wife was driving her 2019 Subaru Forester (purchased new) and the Eyesight disabled and the check engine light came on. The car was still running, but not as it normally would. It had less power but would still maintain the speed limit. At home the car idled differently, like it was running too rich or too lean. The exhaust also smelled funny.

Was driving in the right-hand lane on the interstate with the cruise control set, went to change lanes as I was approaching a slower moving semi truck going up an incline. Cruise control deactivated with no inputs from myself. Vehicle began to decelerate. Looked at instrument cluster, the Check Engine Light was on along with Eye Sight Off symbol. Additional symbols for forward collision avoidance and rear active braking were also on. No warning signs were present prior to the cruise control turning off. The unexpected loss of power increases the risk of collision while traveling on the highway. Vehicle was taken a Subaru dealer, diagnosed with code P2682, Coolant Bypass valve performance, with a recommendation to replace the coolant bypass valve.

On June 20, 2023, the "check engine" light came on my 2019 Subaru Forester and "Eyesight" flashed on my dashboard as disabled. I immediately went to my mechanic and he ran a diagnostic which showed the following: "P26A3 - Engine Coolant Bypass Valve." My car has 75,000 miles and is out of warranty for the powertrain. In reviewing online forums, this problem is a recurring one that is affecting many Subaru owners. The cost is $1,200 to $1,500 to fix. I believe this should be a recall issue. Other drivers have noted sudden engine shutoff but I have not experienced that yet. The car is currently in the shop. Subaru knows this is a problem.

On January 1, my wife was returning home from a grocery run when our 2019 Forester’s dashboard suddenly lit up like a Christmas tree--Check Engine, EyeSight, Anti-Lock Brakes, Anti-Skid, and blue Temperature lights all came on simultaneously. The Forester did not lose any appreciable power but the heater stopped working and was only blowing cold air. My wife was only a couple of miles away and brought it straight home. I checked under the hood but had no idea what was going on, so I drove it over to my local Autozone for a scan, and it came back with the 'P26A3' Code, as well as 'P3300,' and 'P2100' (Throttle Control Motor-Circuit Open). I brought our Forester back home, did some online research, and discovered that this code typically indicates a thermal control valve assembly (TCVA) failure. Our vehicle's 60,000-mile powertrain warranty had just expired but fortunately, we live near...

Eye-sight system shutdown and the car, although it was drivable, ran rough. Since there is a huge reliance on the monitors as they are designed to "forward think" to aid the driver, this was a major disruption to the driving experience. Not knowing what the disabled components affected, was a huge cause for alarm. Upon seeing the check engine light come, my wife brought the car home and I hooked up my device to read the code (P26A3 - showed up). Then I looked up that code and was directed to multiple incidents where that very same thing has become frequent on this model and a few others like it. We called the Winston-Salem NC Subaru Dealer (Flow) and they suggested we bring the Forester in for a check. Once they checked the vehicle out and confirmed the code we mentioned, they told us the "TCV" problem was found on...

The Thermo Control Valve had went out. When the valve went out, the Subaru Eyesight became disabled. This also turned off the forward collision, automatic emergency braking, blind spot warning, lane departure, and rear cross traffic warning and braking. Subaru has a service bulletin, 09-80-21, stating the issue.

Auto safety systems compromised with illumination of check engine light and engine temp warning light. Subaru dealership service department determined problem with Thermo Control Valve. Engine was not overheating as the vehicle was being driven in winter time, February in Alaska. Only indication of problem was indicator lights and reduced heat from cabin heat system. Vehicle went into "limp" mode as soon as warning lights illuminated, disabling advanced safety systems.

Driving uphill when the car suddenly jolted, lost power, and all warning lights became illuminated. All safety features were disabled as well. The sudden stop almost resulted in being rear ended and the car was barely drivable afterwards. Diagnostic trouble codes: P26A6, P2004, P2005, P060B, P0191, P24B9, P2200, P2400.

The engines shut down or stalled on me while driving completely. It did not accelerate when I was trying to move the car off the road. the engines sputtered / shaken , all the lights came up on the dash board, smokes started to come out of my engines. this problem is similar to the recent Subaru recall on the fuel pump. Please add 2019 Forester on your list of recalls. This is a serious and dangerous issue, i could have been killed if I was dring on the freeway. I was lucky it shut down on a little local street when I was dring slow , about 30 - 35 mpg. Imagine if this happened on the freeway, it could have created a chain reaction , and a lot more people will be involved, and deaths might be involved. Please add Subaru 2019 forester sport on your list immediately...

On 10/7/2022, all the warning lights came on and stayed on, even after tightening the fuel cap and replacing the battery. I brought the car to Ocala Subaru this morning, and paid for a diagnostic that shows the Thermal Control Valve needs replacement. Apparently this is now a common problem on this year and model Subaru. I was told that this is not covered under the powertrain warranty, even though it is part of the engine assembly, and is a very expensive repair, even though the car has only 43,669 miles on it. I was told the part is on national back order and that the car is okay to drive, but that most of the safety systems that have the lit warning lights are now disabled. This is the car my wife uses to transport our 6-year-old granddaughter to school and swim practice and events, as well as elsewhere,...

check engine light came on end of August. Took into dealership early September (9/6/22) to find that the P26A3 code or Engine Coolant bypass Valve is defective. I have 47k miles on my 2019 Forester, so luckily it is under the powertrain warranty ( up to 60k). however, dealership is backlogged and waiting on parts . they were giving out loaners but can no longer do it due to the long lead time on parts as well as no place to let vehicles park for several months. I have been driving my vehicle at a limited capacity, however, living in Michigan the days are getting colder, and the need for my defrost to work properly is a must. with this issue my vehicles heating system is never warming up . thus causing a safety issue when I cannot use defrost on my car while waiting for parts to come in....

The problem seems to be a faulty Thermo Control Valve Assembly. When I started the car, the dashboard lit up with several warning signs including the check engine light and 6 or 7 other warning lights. I also received texts and emails from Subaru saying to have my vehicle serviced ASAP. My 2019 Forester only has about 16,000 miles on the odometer. Continuing to drive would cause damage to the engine and potentially the car could abruptly stop on its own. Our car has been in the service department of our dealership for five weeks. I just received a call this morning that we had to return the loaner rental today, but that the thermal control valve is not expected until mid- or late-October. (It is now September 20.) I researched several Subaru blogs, and it seems that many others are having the same issue with their Foresters. Our dealership...

The problem cited below is on a 2019 Subaru Forester with 20,101 miles. The 'check engine' light came on when I started my vehicle as well as all the ADAS warning lights came on. All ADAS were inoperable. The car was drivable so I cautiously drove it to a Subaru dealership. While driving, I noticed the engine never warmed up. Running a cold engine causes an emissions problem and may be a violation of an EPA standard. The problem was diagnosed by the dealership as a faulty Thermo Control Valve Assembly, Part Number (21319AA010). Upon researching the problem on www.SubaruForester.org, I discovered over 240 similar postings about the same complaint on the same model car. I consider this to be a Safey issue with a potential of significant engine damage causing engine failure as well as making all the ADAS inoperable. Subaru of America is aware of the extent of...

The contact owns a 2019 Subaru Forester. The contact stated that the vehicle was in the park position in a parking space but was unsure if the shifter was in park when without warning, the vehicle rolled down a hill and crashed into a chain link fence and burial wall. No warning lights illuminated. The air bags failed to deploy. No injuries were sustained. No medical attention was needed. A police report was not filed. The vehicle was towed to an independent mechanic but was not diagnosed. The vehicle was not repaired. The dealer was notified of the failure and the contact was advised to schedule an appointment to have it diagnosed. The manufacturer was not notified of the failure. The failure mileage was approximately 36,000.

My 2019 Subaru Forester Sport only had 41,000 and the thermal control valve on it failed. The engine is running really cold and sometimes without warning certain safety feature shutoff as a result. There were no warning signals before it failed but when it went out the check engine light came on as well as about 5 other warnings. I had it diagnosed at Young Subaru in Ogden, UT. After doing some research I found that this specific part recently underwent a design change due to this malfunctioning. I’ve found several other Subaru owners that are having the exact same issue where the safety features are completely disabled as a result of this poorly manufactured part. This part needs to be recalled asap before it can continue to cause more damage to the engines or the people who drive these vehicles

The contact owns a 2019 Subaru Forester. The contact stated while at a complete stop at the car wash waiting for his turn, the vehicle accelerated suddenly and unintendedly, and crashed into a concrete brick wall. The air bags deployed. The contact sustained a whiplash, laceration on the left arm, muscle injuries in the back, skin abrasion on the upper arm, Skull laceration. The contact was pinned in his seat by the shoulder strap of the seat belt. The contact was transported to the hospital with the assistance of the emergency units. The vehicle was towed to a body shop where it was totaled. No police report was filed. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 14,000.

The failure is affected by the braking system and control logic of the ignition key switch, gear shift and emergency break button. A coffee cup at the drive through collapsed spilling coffee. Through a sequence of moves I found myself rolling out of the drive up line, across the parking lot right towards the sidewalk and highway on the other side. The engine was off, the brakes would not function, I could not move the shift lever and the ignition key would not re-start the car! I had no control or ability to change anything in the span of 10 seconds. Only the landscaped run of bushes at the edge of the parking lot saved us. At the drive up window the car was in neutral. I could not change the position of the shifter if I had my foot on the break as we were rolling. Nor could I...

The contact's wife owns a 2019 Subaru Forester. The contact stated that as his wife attempted to park her vehicle into a parking spot, the vehicle independently accelerated while her foot was on the brake pedal without warning. The contact's wife steered the vehicle to avoid hitting other vehicles as the acceleration continued; she was eventually able to stop the vehicle. Prior to the failure, the contact stated that while his wife was driving at 35 MPH, the vehicle independently accelerated without warning with her foot was on the accelerator pedal. His wife had to repeatedly depress the brake pedal before the vehicle came to a complete stop. The contact had taken the vehicle to the dealer where it remained in their possession. The manufacturer had yet to be notified of the failure. The vehicle had yet to be repaired. The failure mileage was approximately 21,000.

The car was parked for a week while visiting. (It has recently had its 30,000 mi.service) When I got in and started it, all the dashboard lights lit up including check engine. I tried reaching a Subaru near where I was visiting. No luck so I called my Subaru in VT. I was told I was safe to go as long as the Check Engine wasn't blinking. It wasn't so I drove home (I did note the steering wheel felt "tight".) When I went into the dealership upon my return, they did their computer diagnostic test. It was explained it could be as simple as not tightening the gas cap. The computer turned up something in the wheel. At first, he wanted to give me an appointment a week and a half out, but then found a car he could loan me that following Monday. I wanted to know why...

WHEN DRIVING IN THE HIGHWAY THE VEHICLE STARTS TO JERK VERY STRONG AND HIGHWAY SPEED IS LOST MAKING IT DANGEROUS TO DRIVE AND POTENTIALLY CAUSING AN ACCIDENT. I HAVE TAKEN THE VEHICLE TO THE DEALER AND THEY WILL DO NOTHING ABOUT IT. IT IS A KNOWN ISSUE FOR THIS VEHICLE MODEL AND SUBARU IS NOT FIXING THE ISSUE. THE JERKING IS SO VIOLENT THAT IT COULD BECOME A SAFETY HAZARD FOR DRIVERS AND ANYONE ELSE ON THE ROAD. THE JERKING HAPPENS ON A DAILY BASIS AND SOMETIMES IT IS MORE STRONG.

WHEN DRIVING AT A LOW SPEED THE CAR LOST ALL POWER WITHOUT ANY WARNING LIGHTS .HAD TO PULL OVER AND LET CAR SIT FOR ABOUT 10 MINUTES THEN RESTARTED CAR. I WAS ABLE TO DRIVE BUT IT HAD VERY LOW POWER. CAR CONTINUES TO HAVE LOW POWER AND HESITATED TO ACCELERATE. CAR HAD 38,467 MILES AT THIS TIME. CAR FREQUENTLY HAS A KICKBACK FEEL WHEN ACCELERATING. WHEN PRESSING THE GAS PEDAL IT HAS A DELAY RESPONSE TO MOVE. BROUGHT IT TO THE DEALERSHIP 2 TIMES FOR THIS PROBLEM. THERE IS ALSO A NOISE COMING FROM THE RIGHT REAR AXEL OF CAR SINCE CAR WAS PURCHASED. DEALER CONTINUES TO SAY IT'S A TIRE NOISE AND THEY DO NOT SEEM TO BELIEVE THE OTHER PROBLEMS WITH THE CAR.

TL* THE CONTACT OWNS A 2019 SUBARU FORESTER. THE CONTACT STATED THAT THE WINDSHIELD CRACKED AND WAS REPLACED THREE TIMES IN A SIX-MONTH PERIOD. THE CONTACT WAS CONCERNED THAT THE DESIGN OF THE HOOD AND THE THICKNESS OF THE GLASS IN THE WINDSHIELD WAS A CONTRIBUTING FACTOR TO THE FAILURES. ADDITIONALLY, THERE WAS AN ABNORMAL SOUND IN THE TRANSMISSION WHENEVER THE GEAR SHIFTER WAS SHIFTED INTO REVERSE. THE CONTACT ALSO STATED THAT THE BACKUP CAMERA FAILED TO OPERATE INTERMITTENTLY. THE CONTACT ALSO STATED THAT WHEN THE STOP/START FUNCTION WAS REACTIVATED ON SEVERAL OCCASIONS THE VEHICLE IDLED ROUGHLY AND LUNGED FORWARD. THE VEHICLE WAS TAKEN TO MOORE CHRYSLER JEEP FIAT (8600 W BELL RD, PEORIA, AZ 85382, 800-757-0140) HOWEVER, THE MECHANIC WAS UNABLE TO DUPLICATE THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 50.

OFTEN, BUT NOT ALWAYS, MOSTLY WHEN TURNING LEFT FROM A STOP AS AT A TRAFFIC LIGHT THE CAR WILL HESITATE AND LOSE POWER AND SPEED. THEN I TRY TO ACCELERATE AND THE CAR SURGES FORWARD TOO FAST. I FEEL THAT I AM GOING TO STALL IN THE INTERSECTION.

WHILE DRIVING AROUND 30MPH THE CAR WILL SOMETIMES HESITATE AND THEN LURCH IF THE GAS PEDAL IS VERY LIGHTLY PRESSED. SOMETIMES IT WILL DO IT AT HIGHER SPEEDS AS WELL, AROUND 50MPH BUT NOT TYPICALLY AT FREEWAY SPEED. HAPPENS ON MOUNTAIN ROADS AND CITY STREETS. MOST NOTICEABLE WHEN KEEPING SPEED WITH A CAR AHEAD. WHEN PRESSING HARDER ON THE GAS PEDAL IT IS USUALLY NOT NOTICEABLE. WHEN DRIVING IN 'SPORT' MODE OR WITH MANUAL PADDLE SHIFTERS SET AT 4TH GEAR OR LOWER IT DOES NOT HAPPEN. THIS IS A CVT SPORT MODEL. DROVE A LOANER OF THE SAME YEAR AND TRIM, WHICH SHOWED SIMILAR BEHAVIOR, ALTHOUGH LESS COMMON. SUBARU CLAIMS IT IS NORMAL BEHAVIOR.

VEHICLE QUICKLY DEVELOPED A "SURGE, SPUTTERING, JERK" TYPE ACTION WHEN COASTING OR MAINTAINING SPEEDS ABOVE 35MPH. ALSO WHEN BRAKING, THERE IS GOOD AND PREDICTABLE SPEED REDUCTION UNTIL ABOUT 10MPH WHEN THE TRANSMISSIONS SEEMS TO UNLOCK AND THE CAR LUNGES FORWARD SINCE THERE IS SUDDENLY NOT ENOUGH BRAKE PRESSURE BECAUSE THE TRANSMISSION HAS SHIFTED FOR SOME REASON. DEALER HAS BEEN ABLE TO REPLICATE THE ISSUE BUT HAS NO KNOWN FIX. BRAND NEW CAR 1 MONTH OLD AND IT RUNS LIKE A BRAND NEW CAR SHOULD, UNTIL YOU GET TO MAINTAINING CRUISING SPEEDS. VERY DISAPPOINTING TO HAVE THIS ONE ISSUE WITH SOMETHING THAT IS OTHERWISE A FANTASTIC CAR.