2021 Subaru Outback engine problems

Filed Aug 20, 2026 · Engine, Transmission · CA

Good Day! I bought my 2021 Subaru Outback XT Onyx in Jan 2021. I had waiting 6 yrs for Subaru to use the Turbo Motor in the Outback again. I've had this car for 5 years with my warranty running out Jan 2026, but I only drive 5000-7000 miles per/yr. Current odometer is 29,901 miles. At my most recent oil change service at the Dealer, they showed me a video of my cars drivetrain from underneath. There were two bad seal leaks. One at the transmission pump housing and the other at the Upper Oil Pan. I had been there for an oil change a year earlier for the same service and there was no mention of these issues! After speaking with the service advisor, he said to call Subaru Customer Advocates. They listened to my situation and a few days later offered a $1400 credit for a $4000 job that involves the removal of my cars engine (upper oil pan) to replace it because it's bolted to the frame there. The other leak seal involves dropping the transmission. These are major repairs that following will dampen my ownership experience after decades of Subaru praise by Americans. I researched this issue online and found out there was a manufacturing defective regarding the silicone liquid seals they used for 2020-2022 Outback, Ascent, & WRX! This procedure was used throughout the driveline with the Turbo Motor & CTV Trans. There are 1000s of accounts of this defect placing burden on the owners of these cars who bought them in good faith. I did the research, called the dealer & Subaru with the discovery & overall complaint! I asked for 80% to 100% help with these repairs because how many more will I have to deal with after these two are repaired??? I have received zero responses from either after expressing that this was a known defect, Bullitens went to all the dealers, nothing was mentioned to the owners, and they've just covered those cars still under warranty. Since I didn't drive enough, the seal issues on my car took longer to start leaking, and then out of warranty. HELP!

Filed May 7, 2026 · Engine, Transmission · NJ

Thermo Control Valve Failure- Contact Subaru of Cherry Hill, NJ for Inspection 177,4XX Miles P26A5 code Check engine Light on, Disabled Safety Systems (Eyesight System), Car may have overheated if not pulled over and turned off. Part of warranty extension but did not qualify due to mileage.

Filed Mar 26, 2026 · Acceleration, Engine · CO

The failure involves the engine (powertrain), which was under warranty. The vehicle has experienced four catastrophic engine failures resulting in sudden loss of power, including at highway speeds (65–75 mph). The most recent failure also involved an oil-saturated catalytic converter. These failures occurred between 06/25/2024 and 03/16/2026. During this ~629-day period, the vehicle was only in my possession for about 184 days, as it remained at the dealership for diagnosis, repairs, and repeated engine replacements. The issue remains unresolved. The vehicle is currently in my possession, available for inspection, and is not being driven due to safety concerns. All failures occurred during normal driving and caused sudden loss of power with no prior warning, leaving the vehicle inoperable and stranded. This created a significant safety risk due to inability to maintain speed or safely merge, increasing the likelihood of rear-end collisions. The failures have been confirmed by an authorized Subaru dealership, with multiple engine replacements performed under warranty and most recently as a goodwill repair. Both the dealership and Subaru of America have acknowledged they cannot determine the root cause. The dealership’s Operations Director stated the vehicle is not safe and he would not allow his family to drive it. The vehicle has been inspected multiple times by the dealership and Subaru of America. However, no inspection reports, diagnostic data, or detailed findings have been provided despite repeated requests. Additional issues (including a broken axle and oil-saturated catalytic converter) were only identified during a third inspection after being missed previously. Requests for explanation were not answered, and further details were withheld as “internal.” There were no warning indicators prior to the first three failures. During the fourth, a temperature warning appeared only seconds before failure.

Filed Aug 7, 2025 · Acceleration, Electrical · MD · crash

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.

Filed Jul 24, 2025 · Driver assistance, Engine · 18,640 miles · SC

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.

Filed Apr 2, 2025 · Driver assistance, Electrical · NM

Thermo Control Valve. Check engine light on. Eyesight Adaptive Cruise Control Automatic Emergency Braking Blind Spot Warning Forward Collision Warning Lane Departure Warning Lane Keeping Assistance X mode Dealership would not honor repair even though there is recall it does not cover vin 63400 miles Vehicle inspected by manufacturer code P2682 Check engine light is on and eyesight warning

Filed Dec 14, 2024 · Acceleration, Driver assistance · IL

The speed control (adaptive) doesn't work. The interior heater doesn't work. Several lights including the 'check engine' light come on the dash. The lane departure system doesn't work. (It appears the thermo control value subassembly may be at fault.) The car has approximately 25K miles on it.

Filed Nov 4, 2024 · Brakes, Engine · 24,000 miles · AZ

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.

Filed Oct 16, 2024 · Engine · SC

Thermo control valve failure. Would not cover it

Filed Sep 12, 2024 · Electrical, Engine · TX

The auto restart does not work and requires a car restart to fix. The latest software update caused this is to happen.