This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability. (This is an revised version of the orignal bulletin.)
full bulletin at NHTSA ↗2015 Subaru Outback powertrain problems
severe Owners of the 2015 Subaru Outback have filed 34 NHTSA complaints about the powertrain, typically surfacing around 32,000 miles at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Failure mileage
Complaints
34
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2011 Outback | 208 |
| 2012 Outback | 107 |
| 2013 Outback | 57 |
| 2014 Outback | 25 |
| 2015 Outback (this page) | 34 |
| 2016 Outback | 45 |
| 2017 Outback | 42 |
| 2018 Outback | 14 |
| 2019 Outback | 14 |
1crash
2injuries
When does it fail?
Of the 34 powertrain complaints filed for the 2015 Subaru Outback, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 34 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA powertrain complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability.
full bulletin at NHTSA ↗This bulletin announces the service manual correction regarding clutch master cylinder reservoir service procedures.
full bulletin at NHTSA ↗This bulletin announces a design change made to the CVT Control Valve Body which enhancement was implemented to prevent abnormal operations. The updated valve body incorporates an enhanced valve sleeve to improve durability.
full bulletin at NHTSA ↗This bulletin announces a design change made to the CVT Control Valve Body. The updated valve body incorporates an enhanced valve sleeve to improve durability.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2015 Subaru Outbacks describe a cluster of CVT transmission problems that create safety hazards. The most serious complaint is unintended acceleration or loss of vehicle control—sudden lurching forward or backward, especially when shifting from Park to Drive, coasting to a stop, or during low-speed maneuvers. Several owners report the transmission loses responsiveness entirely, with RPMs climbing but no forward movement, then suddenly surging. Cold-start surging is common: idle climbs to 1800 RPM, drops sharply when shifting, then spikes again while braking or rolling slowly, forcing the vehicle forward against applied brakes.
Transmission failures occur across mileage ranges, from 856 miles to 114,000 miles. One owner faced a $9,319 repair estimate at 75,000 miles; another's replacement transmission failed within months. Dealers consistently tell owners this behavior is "normal operation," even when owners report near-collisions. Owners also report CVT hesitation and non-response during acceleration, particularly in tight-turn situations, and transmission fluid leaks despite dealer repairs. A few complaints mention wheel bearing premature failure—six replacements by 51,000 miles on one vehicle. One owner describes loose suspension bolts and disconnected components left after transmission service. Dealers cannot consistently diagnose these issues, and Subaru's extended CVT warranty leaves owners stranded once mileage limits are reached.
Same Subaru Outback powertrain reports on nearby years: 2012 · 2013 · 2014 · 2016 · 2017
Failure modes owners describe
CVT Unintended Acceleration and Loss of Control
Vehicle lurches forward or backward unexpectedly during shifts from Park to Drive, at stops, or during slow-speed maneuvers. Happens with brakes applied. Occurs after cold starts, during coasting to stops, and when turning. Multiple owners report being pushed through applied brakes by sudden transmission engagement.
When: From early ownership (856 miles) through higher mileage; cold starts and low-speed driving; shifts from Park to Drive
Symptoms owners cite: Sudden lurch forward or backward when shifting into Drive or Reverse; Vehicle surges through applied brakes; Uncontrolled forward acceleration when changing gears; Happens repeatedly over time, multiple occurrences reported
Repairs/costs cited: Dealers run extensive checks but cannot identify cause; one owner faced $9,319 repair estimate for internal CVT failure
Recalls/TSBs owners mention: Extended CVT warranty to 10 years/100,000 miles; dealers tell owners this is 'normal operation'; Subaru refuses cases outside mileage limits
CVT Cold-Start Surging and Erratic Idle
After cold starts, idle spikes to 1600–1800 RPM. When shifted into Drive or Reverse, idle drops to 800–1000 RPM or lower. Engine then surges back to higher RPM when braking or moving slowly, forcing vehicle forward against brakes. Owners believe this is a software issue.
When: Cold starts; below 0°F conditions trigger longer duration; from new vehicle through ownership; more common in winter
Symptoms owners cite: High idle (~1600–1800 RPM) on cold start; Sharp RPM drop to 800–1000 when shifting into gear; Sudden RPM surge when braking or rolling slowly; Vehicle pushes through brakes unexpectedly
Repairs/costs cited: One owner with 18K miles requested firmware update; dealer said none available
Recalls/TSBs owners mention: Dealer told owner this is 'normal' operation and no firmware update exists; Subaru deemed similar complaints 'normal'
CVT Responsiveness Loss and Delayed Engagement
Transmission does not respond when accelerator is depressed, or responds with significant delay. Engine RPMs climb without vehicle moving forward. Shift engagement delay of ~2 seconds occurs when changing from Park to Drive. In Neutral-like conditions, car rolls backward on inclines after reverse-to-drive shift until accelerator is fully depressed.
When: Intermittently; during acceleration attempts; during turns and lane merges; from new vehicle onward
Symptoms owners cite: No response or delayed response when pressing accelerator; RPMs climb but no forward movement; Transmission remains in Neutral after Drive shift until accelerator deeply depressed; Vehicle rolls backward if on incline after reversing and shifting to Drive; ~2 second delay from Park to Drive shift engagement
Repairs/costs cited: Dealers acknowledge this is 'a common problem with the CVT transmission'
Recalls/TSBs owners mention: Dealers claim this is normal CVT operation; no repairs offered
CVT Complete Failure with Loss of Power
Transmission becomes unresponsive; vehicle loses power and will not accelerate. Check Engine and Check Transmission warning lights illuminate. One case involved incorrect transmission fluid installed by dealer; others are unexplained internal failures. Vehicle requires towing.
When: Mileage range 74,000 to 114,000 miles; during highway driving at 55–75 MPH
Symptoms owners cite: Vehicle fails to accelerate while driving; Complete loss of power; Check Engine and Check Transmission warning lights illuminate; Clunking or clanking sounds from transmission; Smell of burning oil
Codes mentioned: Check Engine light, Check Transmission light
Repairs/costs cited: One vehicle diagnosed with incorrect transmission fluid at dealer; another required full teardown by Subaru HQ tech; repair costs $5,000–$9,319+
Recalls/TSBs owners mention: Extended CVT warranty covers some cases up to 10 years/100,000 miles; owner outside mileage limit denied coverage; replacement transmission that failed within months also denied coverage under extended warranty in dispute
CVT Stalling at Stops
Engine stalls when coasting to stop lights or stop signs. Some stalls occur while in Drive. Vehicle may not restart immediately. Dealers cannot replicate the issue during diagnostics. Problem appears linked to low idle or CVT behavior when foot is lifted from accelerator.
When: Intermittently during ownership, particularly during factory warranty period; multiple incidents over time
Symptoms owners cite: Engine stalls while coasting to a stop; Engine dies while in Drive; Difficulty restarting after stall; Occurs when lifting foot off gas pedal near stops
Repairs/costs cited: Dealers cannot replicate; no repairs completed
Recalls/TSBs owners mention: No manufacturer action; covered under factory warranty window but unresolved
CVT Bucking and Jerking During Acceleration
Vehicle bucks, jerks, or lurches when pulling through a stop light or accelerating from stopped position. Motion is unpredictable—sometimes smooth, sometimes violent. Occurs with light acceleration. No Check Engine light present in some cases. One dealer diagnosed internal CVT failure.
When: From early ownership onward; most apparent during low-speed acceleration from stops
Symptoms owners cite: Bucking or jerking motion during light acceleration; Unpredictable lurch forward or backward; Extreme hesitation from idle when making turns
Repairs/costs cited: One dealer estimated $9,319.59 for internal CVT failure repair
Recalls/TSBs owners mention: Extended warranty offered; some owners outside mileage limits denied coverage
Transmission Fluid Leak
Transmission leaks fluid continuously since purchase. Repairs attempted by dealers have not resolved the issue. One repair focused on right differential instead of transmission. Leak persists despite multiple service visits and repairs.
When: Since purchase in January 2015; ongoing through at least July 2017
Symptoms owners cite: Visible fluid dripping from transmission area; Owner documents leak with cardboard under vehicle
Repairs/costs cited: Dealer repairs attempted; still leaking as of July 2017 service; right differential also repaired but did not stop transmission leak
Recalls/TSBs owners mention: Recall campaign 15V502 (Transmission Oil Leak) issued, but one dealer denied recall existed
Premature Wheel Bearing Failure
Wheel bearings fail at abnormally low mileage. One vehicle required six bearing replacements (both rear, front right twice, front left twice) between 29,000 and 51,000 miles. Another failed at 17,000 and 32,000 miles; a third at 40,293 and 76,699 miles. One bearing lasted only 6,000 miles and nearly caused total failure.
When: As early as 17,000 miles; multiple failures within 6,000–16,000 mile intervals; 51,000 mile vehicle had six replacements in 23 months
Symptoms owners cite: Wheel bearing failure requiring hub unit replacement; Bearing failure at second occurrence requiring front axle replacement; One bearing near total failure making vehicle inoperable
Repairs/costs cited: All replacements performed under warranty; costs not specified by owners
Recalls/TSBs owners mention: Covered under warranty; no recall issued despite pattern
Cold-Start Engine Hesitation
Loud squeaky or squealing noise from engine after cold starts, particularly following rain or snow. Noise disappears after several minutes. Dealership cannot replicate and claims nothing is wrong. Owner suspects water is entering belt system.
When: After rain or snow; only on cold starts; occurs intermittently across two years of ownership
Symptoms owners cite: Loud squeaky or squealing sound from engine area; Noise starts immediately after starting engine in wet conditions; Noise subsides after a few minutes; Noise cannot be replicated at dealership in dry conditions
Repairs/costs cited: No repair performed; dealer says 'nothing is wrong'
Recalls/TSBs owners mention: Dealer dismisses complaint; no investigation or warranty work offered
Transmission Shift Delay and Shift Lever Issues
Approximately 2-second delay between shifting from Park to Drive before vehicle begins moving. Push-button ignition cannot be switched to 'OFF' when shift lever is not in Park, despite owner's manual stating it should be prevented—creating potential for unintended movement if ignition is off and vehicle is not in Park.
When: Occurs on every shift from Park to Drive; push-button ignition issue present on multiple Outbacks checked at dealer
Symptoms owners cite: Noticeable ~2 second delay in engagement after Park to Drive shift; Push-button ignition can be turned off with selector lever not in Park; Vehicle can roll if parked without engaging Park with ignition off
Repairs/costs cited: No repair attempted; design issue confirmed on multiple vehicles
Recalls/TSBs owners mention: Owner contacted dealer; they confirmed multiple Outbacks have same push-button issue
Unsafe Repairs and Loose Components After Transmission Service
After transmission replacement, vehicle was returned with critical components left unsecured. Loose suspension bolts connecting ball joints to spindles on both front wheels were discovered by independent mechanic. Subaru later documented additional loose mounting hardware and disconnected PCV hose. Subaru confirmed these conditions would have been unsafe if left uncorrected.
When: Discovered November 2025, following September 2025 transmission replacement
Symptoms owners cite: Loose suspension bolts on front wheel ball joint spindle connections; Loose mounting hardware related to transmission repair; Disconnected PCV hose; Multiple unsecured components after major repair
Repairs/costs cited: Discovered by independent mechanic and confirmed by Subaru of Portland; Subaru documented unsafe conditions in written inspection
Recalls/TSBs owners mention: Subaru of Portland's written inspection acknowledged loose bolts were unsafe; service performed by Bud Clary Chevrolet, Inc., not Subaru
Synthesized from 34 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
Tl* the contact owns a 2015 Subaru outback. The contact stated that while at a complete stop, the vehicle failed to accelerate without warning. The vehicle was taken to a dealer where the technician informed that the vehicle was functioning as designed. The manufacturer was not notified of the failure. The failure mileage was 856. Updated 02/18/15*lj updated 9/12/2017*cn
While driving down freeway at 75 MPH, transmission made two clunking sounds, and speed decreased - rpms increased. We could smell oil burning smell, but no smoke or leaks. We were approximately 12 miles outside of las vegas and 22 miles into our trip. There was no warning and no decrease in speed or other signs prior to the clunks/clanks. Vehicle towed to Subaru of las vegas. First Subaru…
After a transmission replacement performed by Bud Clary Chevrolet, Inc. in Longview, WA on September 9, 2025, my vehicle was returned to me with critical components left unsecured. On November 19, 2025, an independent mechanic discovered loose suspension bolts connecting the ball joints to the spindles on both front wheels. On November 29, 2025, Subaru of Portland documented additional unsecured…
A transmission that was replaced in July of 2023 went bad un December of 2024 and dealership won't give reasons why transmission went bad or what caused a almost brand new transmission with less than 50,000 miles on it went bad. They are demanding we pay $5000.00 dollars on a transmission that was replaced under the extended warranty on cvt transmission from subaru. Which also extends to the…
Had powertrain trouble with your 2015 Subaru Outback?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2015 Subaru Outback?
It's a meaningful issue. 34 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 19 complaints that reported odometer mileage, most powertrain failures cluster between 23,000 and 45,000 miles, with the median around 32,000. A quarter of owners report trouble before 23,000; a quarter make it past 45,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2015/Subaru/Outback.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.