Subaru Outback BT
Weaknesses, engine ratings and buying advice
The 6th-gen Outback (2020–2025) is the best-selling midsize wagon in the US — standard AWD, good ground clearance, and Subaru's reliability reputation. But this generation has a signature defect that defines the ownership experience: windshields that crack spontaneously.
The ceramic deicer element in the windshield creates stress fractures — often with no impact, sometimes from temperature changes overnight. The 2021 had 97 visibility complaints with an average failure at 821 miles. Owners report 3+ replacements in under 12 months. Average repair: $900–$1,400. Subaru issued a warranty extension covering one windshield replacement on affected VINs — and refuses coverage after that. The root cause is confirmed: ceramic deicer material. Check any used Outback windshield carefully before buying.
Powertrain pick: 2.5L FB25D (182 hp, CVT) is the safe, boring choice — oil burning largely resolved vs. pre-2015 generations, 2022+ shows dramatically fewer complaints. 2.4T FA24F (260 hp, Wilderness/XT) is genuinely capable but requires strict 0W-20 oil and 6,000-mile intervals. Early Wilderness (2022) showed FA24 oil pan leaks below 10,000 miles and cam phaser issues — 2023–2024 Wilderness is the sweet spot.
CVT reliability — yes, significantly better than 2010–2015 era. The Lineartronic got better cooling, tougher clutch packs, revised software. CVT failures are not a top complaint on the 6th gen. Fluid change every 25,000–30,000 miles (~$450). Full replacement if neglected: $4,000–$7,000. Head gasket legacy — not for FB25 or FA24. The EJ25 disaster (1999–2011) is not inherited; current engines use Multi-Layer Steel gaskets with redesigned coolant routing. Zero documented head gasket failures as a pattern.
Other issues: parasitic battery drain (average failure 3,563 miles on 2022, two documented electrical fires), EyeSight false emergency braking at highway speed (2021 recall covered 5,402 units), StarLink infotainment freezes (11.6" touchscreen disables HVAC + adaptive cruise simultaneously).
NHTSA recalls: ODS airbag sensor (WRA-24, 103,114 units, 2020–2022 — front passenger airbag may not deploy), CVT inhibitor switch moisture (2021–2023, 95,830 units), driveshaft bolts (2023, 4,311 units), plus 6 recalls on the 2020 model alone including drive chain and fuel pump.
Test-drive checklist: windshield micro-cracks at deicer strip, EyeSight phantom braking at 65+ MPH, cold-start FA24 cam phaser rattle, infotainment lag (>2 seconds switching screens predicts freeze behavior), battery stress test on 2020–2021.
2026 market: 2020 Base–Limited $17,000–$23,000. 2022 Wilderness $21,000–$30,000. 2023 $22,000–$33,000. Insider pick: 2023 Outback — fewest complaints, post-windshield-fix era, improved EyeSight, two-year depreciation absorbed. Avoid 2020–2021 entirely unless well under $18,000 with all 6 recalls confirmed completed.
Generations
Engine Overview
The Subaru Outback BT is available with 2 engine variants — from 167 to 272 hp.
Subaru's volume boxer: 2.5L NA in Legacy, Outback, Forester. Oil consumption class action for 2011-2014 models — piston rings didn't seat properly. Cam carrier seal leaks from ~60k miles (labor-intensive). Thermo control valve on 2019-2022 models: plastic housing fails under heat — Subaru extended warranty to 15 years. Improved from 2023.
- !! Oil Consumption — Piston Rings (2011-2014) from 40,000 km
Class action for 2011-2014 Forester, Legacy, Outback. Piston rings didn't seat due to variable bore roughness. Worst cases: 1 quart per 800 miles.
Symptoms: Extreme oil consumption, frequent top-ups needed, blue smoke possible - !! Cam Carrier Seal Leak from 100,000 km
Known FB engine problem: seal between cam carrier and cylinder head fails. Labor-intensive due to poor access. Service bulletins published.
Symptoms: Oil stain under engine, oil smell while driving, visible oil seepage at cylinder head - !! Thermo Control Valve Failure (2019-2022) from 60,000 km
Electronic TCV plastic housing fails above 200°F. All warning lights simultaneously (EyeSight, front collision). Warranty extended to 15 years/150k miles. Mechanical thermostat replaces TCV from 2023.
Symptoms: All warning lights at once, no heater, fault codes P2682/P26A3/P26A5
+ 1 more engine weaknesses + vehicle weaknesses
Subaru's newest and best turbo boxer: 2.4L direct injection, used in WRX VB, Ascent and Outback XT. Oil pan RTV sealant was the early issue (fixed under warranty, corrected from 2025). Too early for real long-term data, but Ascent owners past 100k miles report trouble-free operation. Budget for carbon buildup cleaning like all DI engines.
- !! Recall: PCV Valve Separation (WUW-08)
Recall WUW-08 (Dec 2019): ~51,600 vehicles. Steel washer in PCV valve separates due to heat cycling — engine oil and fragments enter combustion chamber. Engine loses drive power. Free repair; short block replaced if valve fragments not found.
- !! Thermo Control Valve Failure (2019-2021) from 60,000 km
Plastic thermo control valve (TCV) housing fails under heat cycling. Coolant vapor short-circuits sensor reference line — all driver assist systems go offline. Warranty extended to 15 years/150,000 miles. Affects 2019-2021.
Symptoms: All warning lights simultaneously, vehicle becomes inoperable, disabled safety systems (EyeSight, lane keep), engine overheating - ! Oil Pan RTV Sealant Leak from 30,000 km
Sub-optimal factory RTV application at the oil pan. Service bulletin published, repaired under warranty. Corrected at the factory from 2025.
Symptoms: Oil drops under engine, oil level loss
+ 2 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Windshield Cracks Too Easily Same class action as Impreza/Forester: windshields with EyeSight calibration particularly expensive to replace. Symptoms: Rapid crack spread after stone chip from 30,000 km | Medium | |
| Windshield cracks spontaneously (EyeSight thin glass) Since EyeSight, Subaru uses thinner acoustic glass. Frequent spontaneous cracks without rock impact, often from edge. Replacement must be OEM + EyeSight recalibration. Class action ongoing. Symptoms: Sudden crack without impact, from edges, below EyeSight housing, EyeSight errors or phantom braking after non-OEM replacement. from 20,000 km | High |
Top Reported Issues
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Known Problems and Issues +
A total of 16 weaknesses have been documented for the Subaru Outback BT (2020–2025) — 9 engine-related and 7 vehicle-related. Typical issues affect Body, Electronics, Other, Gearbox. Considered reliable: FA24F (2.4L Turbo DI).
Outback (FB25, 2020–2025) — Be Careful: Oil Consumption — Piston Rings (2011-2014), Cam Carrier Seal Leak, Thermo Control Valve Failure (2019-2022). Power: 175 PS.
What to watch out for with the Subaru Outback? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Subaru Outback BT have? +
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Last updated: February 2026 · All information without guarantee