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Online Service & Repair Manual

2021 Subaru Outback

Factory-derived service and repair information for the 2021 Subaru Outback. Procedures, specifications, wiring diagrams, torque values, and diagnostic trouble codes — instantly accessible from any device.

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  • Includes recalls, TSBs, and NHTSA data
2021 Subaru Outback Service and Repair Manual

Trim & engine coverage

This manual covers the following 2021 Outback configurations:

What's inside the manual

Service procedures

Step-by-step repair instructions covering every system — engine, transmission, brakes, suspension, electrical, body, HVAC.

Wiring diagrams

Full-color and schematic wiring diagrams for every electrical system. Connector pinouts, ground locations, fuse box layouts.

Specifications & specs tables

Torque values, fluid capacities, fastener charts, fluid types, maintenance intervals, and tire pressure data.

Diagnostic codes

OBD-II diagnostic trouble codes (DTCs) with descriptions, probable causes, and pinpoint diagnostic procedures.

TSBs & recalls

Technical service bulletins and NHTSA recall information specific to your vehicle, kept current with the latest issues.

Maintenance schedule

Manufacturer-specified service intervals — what to inspect, replace, and service, mile by mile.

Table of contents

Real sections from the 2021 Subaru Outback manual. Subscribe to access every page.

Quick Lookups

  • Electrical Component Locations
  • Technical Bulletins
  • Wiring Diagrams

Accessories & Equipment

  • Anti-Theft Systems
  • Collision/Avoidance
  • Communication Devices
  • Drivers Assistance Systems - ADAS
  • Entertainment Systems
  • Exterior Lights

Body & Frame

  • Door Locks
  • Exterior Body Panels
  • Exterior/Interior Trim
  • Mirrors
  • Seats
  • Sun Roof/T-Top/Convertible Top

Brakes

  • Anti-Lock Brakes
  • Mechanical - Hydraulic
  • Traction Control

Drivelines & Axles

  • Differentials & Drive Axles
  • Driveshaft & Universal Joints
  • Wheel Hubs

Electrical

  • Body Electrical
  • Charging Systems
  • Component Locations
  • Fuses & Circuit Breakers
  • Gauges
  • Horns

Engine Mechanical

  • Accessory Drive Belts
  • Auxiliary Emission Control Systems
  • Cooling Fan
  • Cooling System (Mechanical)
  • Fuel System
  • Mechanical

Engine Performance

  • Emissions
  • Engine Control Systems
  • Fuel Delivery
  • Specifications
  • System
  • Testing & Diagnosis

General Information

  • Abbreviations
  • Basic Trouble Shooting
  • Brakes
  • Check Lists
  • Driveline/Axles
  • Electrical

Heating, Ventilation & A/C (HVAC)

  • A/C Compressor
  • General Servicing
  • HVAC Control Systems

Maintenance

Section overview

Restraints

  • Air Bag, SRS
  • Passive Restraints
  • Restraints Control Systems
  • Seat Belts

Steering

  • Electronic Steering

Suspension

  • Wheel Alignment
  • Wheels & Tire System

Transmission

  • Automatic Trans

15 top-level sections · subscribe for full step-by-step procedures, torque specs, and wiring diagrams.

Sample page from Quick Lookups/Fluids

A peek at real content from the 2021 Subaru Outback manual.

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NHTSA recalls & safety information

Active recalls reported by the National Highway Traffic Safety Administration for this specific vehicle.

  • POWER TRAIN:SHIFT LINKAGE/CABLE/ROD Jan 26, 2021 NHTSA 21V024000

    Subaru of America, Inc.

    What's wrong: Subaru of America, Inc. (Subaru) is recalling certain 2021 Outback and Impreza vehicles. The continuously variable transmission (CVT) select lever cable nut may not have been tightened properly, allowing the nut to loosen.

    Consequence: A loose nut can lead to a lost of retention in the CVT select lever cable and the gear selector not functioning properly, increasing risk of crash.

    Remedy: Subaru will notify owners, and dealers will inspect, and, if necessary, tighten the nut, free of charge. The recall began February 12, 2021. Owners may contact Subaru customer service at 1-844-373-6614. Subaru's number for this recall is WRA-21.

  • POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM) Jul 8, 2022 NHTSA 22V485000

    Subaru of America, Inc.

    What's wrong: Subaru of America, Inc. (Subaru) is recalling certain 2020-2021 Outback and Legacy vehicles. A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage before the drive chain is completely clamped.

    Consequence: An improperly secured drive chain may slip and break, causing a loss of drive power and increasing the risk of a crash.

    Remedy: Dealers will reprogram the TCU, inspect TCU data for chain slip, and visually inspect the chain guide. If evidence of chain slippage or damage is found, the transmission will be replaced. Repairs will be performed free of charge. Owner notification letters are expected to be mailed August 24, 2022. Owners may contact Subaru's customer service at 1-844-373-6614. Subaru's number for this recall is WRK-22. This recall is an expansion of previous recall number 21V-955.

  • POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH Nov 9, 2023 NHTSA 23V755000

    Subaru of America, Inc.

    What's wrong: Subaru of America, Inc. is recalling certain model year 2021 Crosstrek, 2022 Forester, 2021-2023 Legacy, and Outback vehicles. An insufficient weld may allow water to enter the inhibitor switch, causing it to fail.

    Consequence: An inoperative inhibitor switch may prevent the reverse lights from illuminating and the rearview camera image from displaying, increasing the risk of a crash.

    Remedy: Dealers will replace the inhibitor switch, free of charge. Owner notification letters were mailed January 8, 2024. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WRQ-23.

  • AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER Mar 22, 2024 NHTSA 24V227000

    Subaru of America, Inc.

    What's wrong: Subaru of America, Inc. (Subaru) is recalling certain 2020-2022 Outback and Legacy vehicles. A capacitor in the sensors for the Occupant Detection System (ODS) may crack and short circuit, which can prevent the front passenger air bag from deploying in a crash.

    Consequence: An air bag that does not deploy during a crash can increase the risk of injury.

    Remedy: Dealers will replace the ODS sensors on the front passenger seat, free of charge. Owner notifications were mailed February 3, 2025. Owners may contact Subaru customer service at 1-844-373-6614. Subaru's number for this recall is WRA-24.

NHTSA owner complaints

Anonymized owner reports filed with the National Highway Traffic Safety Administration.

  • UNKNOWN OR OTHER May 12, 2024

    The battery zapped out in December of 2024 in the wintertime and left me stranded. Subaru towed it the next morning and replace for free only bc I mentioned the previous law suit but the battery issue is the same

  • POWER TRAIN,ENGINE Jun 5, 2026

    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.

  • STEERING,SUSPENSION,UNKNOWN OR OTHER Jun 1, 2024

    I am filing this complaint regarding multiple serious safety defects in my 2021 Subaru Outback purchased in July 2021, currently at 48000 miles THERMO CONTROL VALVE FAILURE (26,307 miles) While traveling in the center lane on [XXX] southbound in [XXX] the evening of 1/6/2024 my vehicle suddenly experienced a complete loss of control. It seemed that the car was accelerating and braking at the same time without driver input making it impossible to operate safely. It started shaking and several lights were illuminated on the dashboard, power steering was not working. The car coasted to the right shoulder and starlink was used to call for help. The car was towed to the dealership for repairs. The diagnosis was a failed thermo control valve and related sensor circuit. There were no dashboard lights before the incident that fore shadowed this event. This failure rendered the vehicle completely inoperable at highway speed and posed and extreme risk to the safety of the driver, passenger and other motorists. I am aware that Subaru has extended the warranty on the thermo controls valve to 15 years/150000 miles for 2020-2022 Outback’s which suggests that Subaru had knowledge of the defect. Since the incident several other premature “wear” defects have presented under 48000 miles on a 2021 vehicle: - 41,402 miles: driver side rear strut replaced - 41,402 miles: rear brake pads and rotors - 41,402 miles: driver side front window motor, regulator and run Chanel - 41808 miles: rear knuckle assembly, rear wheel bearing and backing plate replaced - 45,768 miles: front brake pads and and rotors replaced - 48,000 miles: complete exhaust system - 48,000 miles: passenger side front window motor, regulator and run chanel This vehicle has proven to be uncharacteristically unreliable for a Subaru Outback. The intended use for this vehicle is for my children to drive to college nearly 600 miles from home in the fall. This car is not appropriate for this purpose. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

  • ELECTRICAL SYSTEM,UNKNOWN OR OTHER undefined 12, 1969

    This 021' outback XXX purchased in 023'/ 24k Mi Freehold subaru. freehold NJ 'if purchased new would've been on the desk of a local lemon law attorney by now. Over the few years the lock unlock function of key fobs stubbornly, randomly & repeadedly dont work. Freehold subaru saw no problem. Front passenger window months ago wouldn't go up. Freehold subaru supposed repaired at a cost to me. Recent cold weather with a brand new battery of 6 Mos old rendered the car unable to start or boost. Vehicle towed to Freehold tire center st freehold NJ, replaced a $400 battery. brought the 6 mo. old battery back to auto zone who load tested and advised nothing Wrong w battery? Not to mention the sub standard BS feature of coming to a stop, foot on brake & engine stopping-starting when proceeding? this is something of concern of being rolled over by an approaching truck in the rear of this 021' outback because 3 times when stopping at a red light the engine shut off and when proceeding, foot off the brake the engine wouldn't re-start & all the indicators on instrument cluster lit up, had to restart the car. Recent event where my wife, [XXX] old legally disabled- primary driver comes out of a store, starts the outback, puts in reverse to back out of a spot and the car dies. This vehicle is being brought into Freehold subaru south st. Freehold NJ Tues morning Apr. 21st 026' south st and is not being picked up due to it being unsafe to operate. Until all the issues are corrected. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

  • POWER TRAIN,VEHICLE SPEED CONTROL,ENGINE undefined 2, 2026

    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.

+ 283 more complaints on file. Subscribe for the complete list.

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FLUID CAPACITIES
Fluid Type Application Standard Metric Fluid Spec Note S/H
Air Cond Compressor Oil 4.70 OZS. 0.13 L DENSO Oil 12 S
Air Cond Refrigerant 0.95 LBS.