Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2021 Subaru Outback owners, lightly cleaned up (personal details are redacted by NHTSA).
The engine block of our car caught fire while it was parked and turned off. It melted the engine and hood of the car, totaling it. Thankfully, we were not in the vehicle when the incident occurred, so no one was injured. At the time of the incident, our car was parked outside our apartment building under a low-hanging tree, which was burned in the fire. Had a neighbor not noticed and called 911, the fire may have spread to the nearby apartment building and caused much more severe damage than what was already done to the car. We had no warning prior to the incident. To our knowledge, the car was in perfect condition. We had bought it brand new 16 months prior and had taken it in for its scheduled maintenance 3 times. We are unaware if the vehicle has been inspected yet or if they've discovered the origin of the problem. …
While slowly backing out of a parking space, the vehicle suddenly accelerated on it's own - I do not recall pressing on the accelerator but the engine surged and the vehicle rapidly reversed and struck 4 other parked cars. It felt as if the accelerator became stuck and would not respond to braking. No warning light or dashboard alerts appeared. Subaru eyesight and adaptive cruise control were not engaged at the time. There was no known obstruction under the petals. This felt like a serious malfunction and could have caused serious injury. I am reporting this in case it is part of a wider issue affecting this model and because i see that there are multiple complaints to you about sudden unintended acceleration, especially during low speed maneuvers like backing out a parking space.
The contact owns a 2021 Subaru Outback. The contact stated while driving approximately 40 MPH, the check engine, ABS, and brake warning lights illuminated. The contact pulled over to the side of the road. The contact turned off the vehicle and waited for several minutes before restarting the vehicle; however, upon restart the transmission failed to shift into the desired gear. The vehicle was towed to a local dealer to be diagnosed. The contact was informed that the vehicle was not covered under warranty due to a third-party damage to the rear brake cable. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 24,000.
The contact owns a 2021 Subaru Outback. The contact stated that while driving approximately 55 MPH, the vehicle stalled. During the failure the "Eyesight" message was displayed, and the check engine warning light was illuminated. The vehicle was later towed to the local dealer who diagnosed that the thermal control valve had failed and needed to be replaced. The thermal control valve was replaced, and the vehicle was repaired. The manufacturer was notified of the failure informed of the extended warranty coverage related to the failure. The failure mileage was 18,640.
The contact owns a 2021 Subaru Outback. The contact stated while at a traffic light, the vehicle stalled. The instrument panel lights illuminated then went dark. The police came but there was no police report filed. The police had the vehicle towed to a dealer. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 12,500.
The contact owns a 2021 Subaru Outback. The contact stated while coming out of a full stop, the vehicle would stall without warning. The contact stated no warning light was illuminated. The vehicle was taken to a local dealer but was not diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 6,500.
I walked outside my house yesterday morning to find my 2021 Outback XT idling in the driveway. I may have failed to turn the engine off, or it may have started itself. Nonetheless, I calculate that it burned about five gallons of gasoline and probably ran all night. The car should not be able to run for hours on end! This is a clear problem--an overheated catalytic converter could start a fire, someone could have jumped in and driven away, or--much worse--it could have been running in an enclosed area and filled it with CO.. This car does have remote starting capability, so I wonder if that somehow played a role. It also has the start-stop function to save gas. I have noticed that if I stop the car and hit the start/stop button right away, it sometimes seems to stop but then runs on. I strongly believe that the car should not be able to run on like this. …
Traveling toll road /fwy at approx 70mph at rush hour and lost all power with Check engine light , emergency brake, lurching engine, all flashing at the same time!!! Coasted through 4 fwy lanes to offramp and service station- extreme danger!!! How was there no pile up with me going from 70-10 to coasting on a busy 15 Northbound fwy at 7:30 am?????? Was in toll lane and crossed toll 3 foot sticks to exit at first available exit. 2 cars followed me off as they were concerned for my safety Towed to shop where they put in new thermo valve, gasket intake manifold, Pipe ay- fuel and gasket egr pipe 56000miles, 2 year old car 3 replaced windshields in last 6 months They said they've done 10 cars with this problem in the last year???? Insurance covered windshields , service center at Subaru inspected car
Today while waiting at a stop light the auto start stop engaged. When the light went green I put my foot on the gas and the vehicle stalled. The car was on but not running, several alarms were on the dashboard. I had to put the car in park, turn it off and then restart the car. This is a repeated issue and has been going on at least once a month since we purchased the car in 2021. We've brought it to the dealer and they said there was nothing wrong because there was no OBD code. I have checked myself and I have not found any code. This is extremely unsafe
My 2021 Subaru Outback vehicle is subject to a recall for engine harness and ECM replacement, according to Subaru. I took my car in twice to the dealership and it was unable to perform the recall repair. That dealership told me that the issue presents no safety problem - is that true? (The current recall of 2022s sound like there is a safety issue.) Your website says my repair was performed. That is false. Can you help me understand why you show the vehicle has been repaired? Can you help me find a dealership that knows how to safely repair the car?
Engine complaints in other Outback years
Frequently asked questions
How common are engine problems on the 2021 Subaru Outback?
NHTSA has 23 complaints about the engine & cooling of the 2021 Subaru Outback, 8% of the model year's 298 complaints.
Is there a recall for 2021 Subaru Outback engine problems?
No. NHTSA lists no engine & cooling recall for the 2021 Subaru Outback, though it has 4 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2021 Subaru Outback engine problems start?
Half of the complaints with a recorded mileage happened before about 19,000 miles, and 100% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 0 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.