2012 Subaru Outback Problems: 16 Known Issues

On the 2010-2014 Subaru Outback, on 2010-2014 Legacy and Outback models, contamination inside the windshield wiper motor bottom cover can cause internal components to interfere. If an obstruction such as snow or ice prevents the wiper arms from returning to the park position, the motor can overheat: the wipers may stop working (reducing visibility) and the bottom cover may melt, creating a fire risk. NHTSA recall 16V694000 (Subaru campaign WTK-71) covers roughly 592,000 vehicles and supersedes the earlier 11V-469 recall — vehicles remedied under the prior campaign still require the updated bottom-cover replacement.

On the 2010-2014 Subaru Outback, 2010-2014 Outbacks (part of a wider 2003-2014 Subaru recall population) are covered by the industry-wide Takata airbag recall for the FRONT PASSENGER airbag inflator. The ammonium-nitrate propellant can degrade after years of exposure to heat, humidity, and temperature cycling, causing the inflator to rupture during deployment and spray sharp metal fragments at occupants — a defect linked to deaths and serious injuries nationwide. Subaru's campaign for the affected inflators is TKB-20 (with related campaigns TKA-20, etc.). The driver-side front airbag on these Subarus did not use a Takata inflator and is not affected. Risk rises with vehicle age and hot/humid climates, and these inflators have in some cases been recalled a second time ('like-for-like' interim replacements later re-recalled).

On the 2010-2015 Subaru Outback, early Lineartronic CVT Outbacks (2010-2015) have documented internal CVT failures — most commonly valve-body faults, but also chain/pulley and pressure-control problems — that can cause harsh or delayed engagement, RPM flare, jerking, limp mode, or complete loss of drive. Subaru extended the CVT powertrain warranty to 10 years / 100,000 miles on 2010-2015 Legacy/Outback 2.5L CVT and 2015 3.6L CVT models (and related models) under bulletin 16-107-17R, while stating the extension was not in response to a specific condition. A revised/upgraded valve body is installed at repair. This is separate from the low-speed torque-converter shudder complaint; here the transmission can set fault codes and go into failsafe. Out of warranty, a full CVT replacement is a multi-thousand-dollar repair.

On the 2012-2019 Subaru Outback, the Lineartronic CVT can develop shudder, hesitation, or jerky operation, especially during light acceleration at low speeds. Subaru has updated CVT software multiple times to address these concerns.

On the 2005-2014 Subaru Outback, p0741 sets when the ECM/TCM commands the torque converter clutch to lock up but the expected reduction in converter slip doesn't happen. On the older automatic-transmission Outbacks (4EAT on 2005-2009 2.5i, 5EAT on 3.0R and 3.6R; 2010-2014 2.5i automatics use the Lineartronic CVT and are not covered by this description) the dominant real-world causes are a failed torque-converter-clutch (lockup) solenoid on the valve body, a poor ground on the transmission harness, or dark/burnt/contaminated ATF and debris blocking fluid flow to the converter. It is frequently misdiagnosed: shops assume the converter itself is bad and quote a transmission-out job, when the actual fault is a cheap solenoid, a bad ground, or fluid that was never serviced. Neglected fluid is the common thread on high-mileage cars.

On the 2011-2019 Subaru Outback, 2.5L Outbacks are prone to premature catalytic converter degradation that sets a P0420 (Catalyst System Efficiency Below Threshold) check-engine light, often well before 100,000 miles. On some 2015-2016 2.5L Legacy/Outback models the front exhaust pipe assembly (which houses the front catalyst) can crack at the flexible bellows — Subaru issued voluntary recall/campaign WUJ-95 to replace the assembly. Separately, cars with the FB-series oil-consumption issue can contaminate and prematurely poison the catalyst with burnt oil, accelerating the P0420 failure. Catalytic converters are covered by the federal 8-year/80,000-mile emissions warranty.

On the 2010-2022 Subaru Outback, p0455 indicates a large (gross) EVAP leak — the system can't hold pressure/vacuum at all during the self-test. Across the Subaru lineup (Outback, Forester, Impreza, Crosstrek) the standout pattern is the purge control solenoid valve failing due to internal seal degradation, which leaves the system effectively open. The other frequent Outback source is the charcoal canister assembly behind the left-rear wheel: later Outbacks integrate a leak-check valve mounted on the canister, and a stuck/failed valve or a cracked canister triggers P0455. A badly missing, cross-threaded, or grossly leaking gas cap will also set it. Unlike the small-leak P0442, a gross leak often comes with a noticeable fuel-vapor smell near the tank/filler.

On the 2010-2019 Subaru Outback, on the Subaru boxer engine, Bank 2 is the driver's side (cylinders 2 and 4). P0430 sets when the driver-side rear (downstream) O2 sensor tracks the front sensor too closely, telling the ECM the catalytic converter is no longer scrubbing exhaust efficiently. On the Outback this most commonly appears on the 3.6R H6 (EZ36), which has a separate catalyst per bank; on 4-cylinder Outbacks, the Bank 1 twin code P0420 is more common than P0430. A well-known Subaru wrinkle: excessive oil consumption on some cars coked the O2 sensors and contaminated the converter, so a P0430 (or P0420) is frequently traced to a lazy/oil-fouled rear O2 sensor rather than a truly dead cat. After ~120k-150k miles the washcoat genuinely degrades and the converter itself fails.

On the 2005-2022 Subaru Outback, p0442 means the ECM detected a small leak in the sealed evaporative-emissions system during its self-test. On the Outback the three usual culprits, in order, are: (1) the fuel filler cap — its rubber O-ring hardens and cracks with age, or the cap isn't clicked tight, or a non-OEM cap seals poorly; (2) the EVAP purge valve (solenoid), which should hold vacuum but starts to weep past its internal seal; and (3) the vent valve on/near the charcoal canister, which can't seal during the leak test if dirt or corrosion is present. Because the leak is tiny, drivers usually notice nothing but the check-engine light, and the code is often intermittent (comes and goes with temperature and fuel level).

On the 2011-2019 Subaru Outback 2.5L FB25, some early FB25 2.5L engines burn enough oil that owners have to top up between oil changes, and some get the low-oil warning light. Subaru's service bulletin 02-157-14R ties the problem to the oil-control piston rings. Subaru changed the rings' surface treatment and put redesigned rings into production. On the Outback, the bulletin covers 2013-2014 models: every manual-transmission car, plus 2013 CVT cars below VIN D*321435 (engine number below 151602). Cars built after the ring change are outside the bulletin. Wikipedia lists the FB25 in the North American Outback from 2013 to 2019. Subaru first fixed these engines with new piston rings under bulletins 02-143-13R, 02-144-13R and 02-145-13R, then switched to replacing the whole short block. Owners in the Yaeger v. Subaru of America class action (D.N.J.) said the piston rings were defective and that ring replacement did not reduce the oil use. Subaru denied the engines were defective but settled. The settlement extended oil-consumption coverage to 8 years/100,000 miles. Subaru's bulletin also says some oil use is normal. Under hard driving, towing, long idling or extreme temperatures, the owner's manual figure Subaru quotes is up to 1 quart per 1,200 miles.

On the 2011-2019 Subaru Outback 2.5L FB25, the FB25 has better head gasket reliability than the older EJ engines, but some vehicles still have head gasket failures. External oil and coolant leaks can develop, particularly at higher mileage. On a Legacy owners' forum, one owner said the head gasket on his 2015 Legacy, which has the same FB25 engine, was replaced at about 35,000 miles. Other members of that forum said head gasket failures are uncommon on FB engines, and some said that no coolant passages cross the head-to-block joint on this design. An oil-wet seam near the head gasket may actually come from a neighbouring joint. On FA and FB engines, the timing chain cover, cam carriers, cam caps, upper oil pan and oil pan are sealed with liquid gasket (FIPG/ThreeBond), not formed gaskets. Subaru says field research led it to improve how this sealant is applied on the production line. Its service bulletin 02-192-24R, which covers all FA and FB engines, tells technicians to find the exact leaking joint first, to avoid unnecessary repairs.

On the 2010-2019 Subaru Outback, p0011 sets when the Bank 1 (passenger-side) intake camshaft is advanced beyond the ECM's commanded position — the AVCS phaser is stuck advanced or the ECM can't control it. On the Outback this is almost always oil-related: low or dirty engine oil, or the passenger-side intake oil control valve (OCV) sticking, or the classic Subaru issue of clogged filter screens inside the banjo bolts that supply oil to the AVCS solenoids. The ECM drives the oil-flow control solenoids mounted on the valve covers, which move spool valves to route oil pressure into the cam phaser; any restriction over-advances or locks the cam. It often appears in extreme cold (thick cold oil starves the AVCS) and on cars with stretched oil-change intervals. A useful test is swapping the Bank 1 and Bank 2 intake OCVs and seeing whether the code follows to P0021.

On the 2010-2022 Subaru Outback, outbacks with a sunroof/moonroof commonly develop interior water leaks caused by clogged, kinked, or (on some 2020 Touring XT builds) factory-blocked sunroof drain tubes. Rather than draining out, water backs up in the sunroof frame and overflows into the headliner and down the A-pillars, soaking the front and rear footwells, wetting carpet/underlay, and in some cases flooding audio/electrical components under the seats — which can then cause secondary electrical faults and musty odors/mold. Subaru has issued service bulletins for water intrusion (e.g., leaks appearing at the map-light/overhead area on 2010-2013 Legacy/Outback). Complaints span many model years and generations.

On the 2010-2019 Subaru Outback, the factory foam gasket behind the roof-mounted center high-mount stop lamp (CHMSL) on the tailgate deteriorates within a few years, allowing rainwater and car-wash water to seep past the light housing and run down the inside of the rear glass into the cargo area. This is a widely reported complaint on 4th-generation (2010-2014) and 5th-generation (2015-2019) Outbacks and is distinct from the sunroof/moonroof drain-tube leak (the water path here is the tailgate brake-light seal, not the roof drains). Standing water can wick into the spare-tire well and rear wiring/connectors, causing corrosion and occasionally electrical faults.

On the 2010-2024 Subaru Outback, owners across multiple Outback generations report premature wheel hub bearing failure, most commonly showing up between roughly 80,000 and 120,000 miles. The classic symptom is a low-pitched droning/humming or 'beehive' noise that begins around 45-55 mph and gets louder with speed, and that changes pitch when the car is loaded up in a curve (louder turning one direction, quieter the other). Subaru hubs frequently fail WITHOUT the traditional 'play' you can feel by rocking the wheel, which leads to misdiagnosis as tire noise. Some owners report replacing three separate bearings on a single car. A useful field test is an infrared thermometer after a highway drive: a failing bearing runs noticeably hotter (~150F+) than its healthy siblings (~120F).

On the 2010-2019 Subaru Outback, owners report the HVAC blower fan suddenly stops working on all or some speeds, leaving no air from the vents for heat or A/C. Common root causes on the Outback are a blown blower fuse, a failed blower motor resistor (manual A/C) or power transistor/output stage (automatic climate control), a worn-out blower motor (dry bearings, often preceded by a whirring/droning noise behind the dash), and corroded connectors or rodent-chewed wiring. A useful clue: with a bad resistor the fan often still runs only on HIGH (which bypasses the resistor); if nothing works on any speed, suspect the fuse, motor, connector, or control head. It's a comfort/defrost issue (defrost failure can be a safety concern in winter).