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2020 Subaru Forester Engine Problems

31 owner-reported engine complaints from NHTSA data

31
Complaints
1
Crashes
2
Fires
Jan 2024Dec 2025
Date Range

Data sourced from NHTSA public database. For informational purposes only. Always consult a qualified mechanic.

Owner Complaints (31)

criticalENGINE
Filed: Dec 2025

While driving my 2020 Subaru Forester at approximately 15 MPH, the engine unexpectedly shut off, resulting in an immediate loss of propulsion (vehicle stall while in motion). This created a safety risk because the vehicle was in traffic and could have been struck from behind or lost the ability to accelerate out of danger. No crash occurred and there were no injuries.

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NHTSA #: 11707836
criticalENGINE
Filed: Nov 2024

DEFECTIVE THERMOSTATIC CONTROL VALVE- This part NEEDS to be recalled. Manufacturer has extended the warranty on the part, so it was free to replace. Otherwise, it's a $1600 part.

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NHTSA #: 11624312
criticalENGINE
FireFiled: Jun 2024

The contact owns a 2020 Subaru Forester. The contact stated while driving at 60 MPH, a deer jumped in the roadway causing damage to the front driver-side engine compartment. No air bags had deployed.

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NHTSA #: 11593129
criticalENGINE,LANE DEPARTURE,FORWARD COLLISION AVOIDANCE
Filed: Apr 2024

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.

NHTSA #: 11585614
criticalENGINE,FORWARD COLLISION AVOIDANCE
Filed: Mar 2024

On Sunday, [XXX] we were traveling in our 2020 Subaru Forester on a trip from Minnesota to Florida for a vacation. Not long into cross country trip we found ourselves stranded on the side of the highway uncertain about the ability of our vehicle to continue to due to a defective Thermo Control Valve failure.

NHTSA #: 11576156
criticalENGINE,FORWARD COLLISION AVOIDANCE
Filed: Jan 2024

The contact owns a 2020 Subaru Forester. The contact stated while driving 75 MPH, the Forward Collision Avoidance Automatic Emergency Braking system activated and applied the brakes. The contact was able to pull to the shoulder of the roadway, where he smelled a burnt smell in the interior of the vehicle.

NHTSA #: 11567365
criticalENGINE
Filed: Jul 2023

While driving on the highway, the engine suddenly stopped and several warning lights appeared on dash. Driver was able to coast to shoulder but could have been a bad accident. It happened again on the way to dealer service center.

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NHTSA #: 11533817
criticalENGINE AND ENGINE COOLING,SEATS
Filed: Mar 2023

The contact owns a 2020 Subaru Forester. The contact stated while driving 35-38 MPH in cold weather, the temperature gauge indicated that the vehicle temperature was cold. The check engine warning light was illuminated.

NHTSA #: 11513406
criticalENGINE
Filed: Mar 2023

I was on the highway doing 70 MPH with the adaptive cruise control set. Then suddenly the check engine light turned on, the eye site and cruise shut down and the car slowed down quickly to 60 MPH almost getting rear ended. This Subaru Forester has 65,592 miles.

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NHTSA #: 11511658
criticalENGINE,FUEL/PROPULSION SYSTEM
Filed: Oct 2021

The fuel saving stop/go feature is unsafe. It stops engine at signal lights and during stop and go traffic. When it restarts the engine shakes and hesitates to go when signal lights changes.

NHTSA #: 11435276
criticalENGINE,FUEL/PROPULSION SYSTEM
Crash / FireFiled: Sep 2021

At one year old this vehicle was involved in a frontal collision with a deer and immediately upon impact burst into flames. The fire breached the firewall between the engine compartment and passenger compartment within less then a minute. Within 2 minutes the engine compartment and front seat area was completely engulfed in flames and within 3 minutes the entire vehicle was engulfed.

NHTSA #: 11434211
highENGINE
Filed: Jan 2025

Upon exiting freeway, all lights on car came on including brake light. When placed in park, the engine would rev. If placed in drive, car would drive without gas given.

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NHTSA #: 11638104
highENGINE
Filed: Dec 2024

Subaru Forester engine stalls at an intersection due to auto start stop feature of subaru to save fuel, except that this is the second time when engine is idling it lowers the revs and then it stalls when trying to auto start engine; first time the dealer said is battery issue, I replaced the battery at my cost, and this is the second time.

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NHTSA #: 11628162
highENGINE AND ENGINE COOLING,VEHICLE SPEED CONTROL
Filed: Jul 2024

The contact owns a 2020 Subaru Forester. The contact stated while driving 70 MPH, the vehicle failed to accelerate and then stalled. The driver was able to pull over safely.

NHTSA #: 11598271
highENGINE
Filed: Mar 2024

I was at a red light when the engine shut off and the check engine and several other warning lights came on. After multiple tries I was finally able to restart the vehicle and drive it off the road. After taking it to the dealership the confirmed issue is the Thermal Control Valve.

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NHTSA #: 11577736
highENGINE
Filed: Feb 2024

My thermo value went bad on my 2020 Forrester with no symptoms or warning causing me to become stranded in the middle of an extremely busy road. This is seemingly known problem and I'm unsure why Subaru has not been more proactive with this knowledge, not allowing others to end up in the same dangerous situation I was left in.

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NHTSA #: 11570929
highENGINE AND ENGINE COOLING,ENGINE
Filed: Jul 2023

The contact owns a 2020 Subaru Forester. The contact stated that while driving approximately 70 MPH, the accelerator pedal was depressed, and the vehicle started to lose motive power. The check engine warning light was illuminated.

NHTSA #: 11532338
highENGINE
Filed: Jun 2023

While driving on an Interstate highway the engine suddenly lost power and various warning lights lit up on the dash, including brake, eyesight, RAB. Managed to limp to the shoulder without getting hit and had the car towed to the dealer, who replaced the thermo control valve assembly under warranty.

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NHTSA #: 11528607
highENGINE,LANE DEPARTURE
Filed: Feb 2023

Car stalls occasionally while stopped in traffic, at a signal, stop sign, and in heavy street or highway traffic. I have read about this, and it is problematic for this make and model, posing a significant safety hazard.

NHTSA #: 11506334
highENGINE,FORWARD COLLISION AVOIDANCE
Filed: Oct 2022

This is about a problem of which your agency is already aware. Subaru of America has been aware of a defective Thermo Control Valve for almost a year (Part 21319AA010). The part was redesigned since the initial part was subject to extreme corrosion.

NHTSA #: 11490977
mediumENGINE
Filed: Jun 2025

my Subaru suddenly had numerous warning lights go on. Took it to the dealer and they said it was due to a recalled part: thermo control valve. They replaced it for free but said my head gaskets needed to be replaced after checking my oil for $4000 plus.

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NHTSA #: 11665729
mediumENGINE,LANE DEPARTURE,FORWARD COLLISION AVOIDANCE
Filed: Dec 2024

"Check Engine" light along with "Eye Sight" appeared suddenly on Nov. All safety systems along with cruise control became inoperable. Took car to Subaru dealer and it was confirmed to be the catalytic converter.

NHTSA #: 11628642
mediumENGINE
Filed: Jun 2024

P2682 Engine overheating and engine gauge flashing red due to a recall related to the engine coolant bypass valve. The vehicle stopped and required a tow for $417 to the nearest Subaru dealership to repair. After towing to the dealership they charged 31% of parts to labor and would not eliminate or discount the invoice.

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NHTSA #: 11597562
mediumENGINE,FORWARD COLLISION AVOIDANCE
Filed: Feb 2024

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.

NHTSA #: 11571270
mediumENGINE,FORWARD COLLISION AVOIDANCE
Filed: Dec 2023

Check engine light came on, low temp light stays on, Eyesight disabled, lane departure, emergency breaking, etc have all been disabled due to the issue. I took it to the local autobody shop and they found code p0128 | Coolant Thermostat Issue. This has caused all safety features to become disabled as mentioned above.

NHTSA #: 11557874
mediumENGINE,FORWARD COLLISION AVOIDANCE,LANE DEPARTURE
Filed: Sep 2023

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.

NHTSA #: 11545341
mediumENGINE,LANE DEPARTURE,FORWARD COLLISION AVOIDANCE
Filed: Mar 2023

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.

NHTSA #: 11514209
mediumENGINE AND ENGINE COOLING
Filed: Oct 2022

The contact owns a 2020 Subaru Forester. The contact stated while driving approximately 30 MPH, the check engine warning light illuminated. The contact stated that the check engine warning light remained illuminated after starting the vehicle and shifting to drive(D) or reverse(R).

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NHTSA #: 11490232
lowENGINE
Filed: Mar 2024

The Thermo Control Valve is faulty and renders the vehicle non-operative. There have been numerous instances in Subaru Foresters in the same make and year.

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NHTSA #: 11578484
lowENGINE
Filed: Mar 2024

The Thermal Control Valve failed on my car and it’s only 3 years old. This is a common issue and is widely known within the forums. Subaru should recall these valves as they are failing prematurely.

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NHTSA #: 11577808
lowENGINE
Filed: Mar 2024

I stopped at a red light. The car's auto shutoff feature turned the car off for the fuel savings. When the light turned green and I went to go, the car tried to start and failed.

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NHTSA #: 11576443

Other 2020 Subaru Forester Issues