2021 Subaru Ascent
Vehicle Specs & Maintenance Data
The 2021 Subaru Ascent maintenance specs on this page cover the key fluids, torque values, and wear items you need for routine service. Use these numbers as a quick reference when performing oil changes, tire rotations, brake jobs, and other scheduled maintenance on your Subaru Ascent.
For oil changes, the 2021 Subaru Ascent takes 0W-20 Full Synthetic motor oil with a capacity of 5 quarts. Brake fluid type is DOT 3, the recommended coolant is Super Long Life Coolant (Blue), and transmission fluid is Subaru ATF. Always use the manufacturer-recommended fluids to maintain warranty coverage and engine longevity.
When mounting wheels on the Subaru Ascent, torque the lug nuts to 89 ft-lbs using a calibrated torque wrench. Over- or under-torquing can lead to warped brake rotors or loose wheels. Re-torque after 50 to 100 miles on newly installed wheels.
Owners of the 2021 Subaru Ascent have reported 5 common issues including "PTC Heater Ground Bolt Fire Risk", "Premature Brake Rotor Warping" and "CVT Transmission Shuddering and Lurching". Scroll down to the Diagnostics tab for detailed descriptions, solutions, and estimated repair costs.
There is 1 NHTSA safety recall on file for the 2021 Subaru Ascent. Check the Recalls tab below for full details.
Specifications on this page are compiled from multiple publicly available sources including manufacturer documentation, NHTSA data, and automotive databases. Always cross-reference with your owner's manual or official factory documentation before purchasing parts or performing any service.
The 2021 Subaru Ascent uses 0W-20 Full Synthetic motor oil (5 qt capacity), requires lug nuts torqued to 89 ft-lbs, takes DOT 3 brake fluid.
Manufacturer-recommended maintenance schedule for the 2021 Subaru Ascent. Always verify intervals against your owner's manual.
Enter a diagnostic trouble code to see causes, symptoms, and fixes for the 2021 Subaru Ascent.
Common problems reported by 2021 Subaru Ascent owners, with recommended fixes and estimated repair costs.
PTC Heater Ground Bolt Fire Risk
The ground bolt securing the ground terminal of the Positive Temperature Coefficient (PTC) heater may have been improperly fastened, potentially causing melting of the ground terminal and surrounding components. This creates a fire risk and affects up to 271,694 vehicles.
Subaru issued a recall for 2019-2022 Ascent vehicles to inspect and properly fasten or replace the PTC heater ground bolt and terminal. Dealers perform the inspection and repair free of charge.
Est. Cost: $0 (recall)Premature Brake Rotor Warping
Brake rotors warp as early as 8,000 miles, causing severe brake pedal pulsation and steering wheel vibration during braking. A Subaru dealer employee acknowledged the brakes were under-engineered for the vehicle's 4,500+ lb curb weight.
Rotor and pad replacement with upgraded components. Some owners have found success with aftermarket drilled/slotted rotors rated for heavier vehicles. Proper break-in procedure after replacement is critical.
Est. Cost: $400 - $1,000CVT Transmission Shuddering and Lurching
The CVT transmission shudders and the vehicle jerks and lurches forward, particularly during low-speed maneuvers and when accelerating from a stop. Some owners are unable to accelerate smoothly after stopping, creating unsafe traffic situations.
CVT fluid replacement and TCM software update at the dealer. A TSB may address CVT calibration for improved low-speed behavior. In severe cases, the CVT torque converter or complete CVT assembly requires replacement.
Est. Cost: $200 - $6,000Front Strut Rumbling and Rattling Over Bumps
A rumbling or rattling noise comes from the front undercarriage when driving over bumps. Subaru made a design change to the front strut assemblies to address this issue, indicating it was a known engineering concern.
A Subaru TSB addresses this with replacement of the front strut assemblies with redesigned units. Surface rust treatment on the strut mount retaining nut area is also recommended.
Est. Cost: $300 - $800Windshield Cracking Without Impact
The windshield develops cracks spontaneously without any impact or stone chip, similar to complaints across the Subaru lineup. The large windshield area and steep rake angle may contribute to stress cracking.
Full windshield replacement with OEM glass. EyeSight recalibration is required after replacement. Subaru goodwill coverage may apply within the warranty period if no impact point is visible.
Est. Cost: $500 - $1,300 (includes EyeSight recalibration)1 NHTSA safety recall for the 2021 Subaru Ascent. Check your VIN at NHTSA.gov
ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH
Park OutsideSubaru of America, Inc. (Subaru) is recalling certain 2019-2022 Ascent vehicles. The ground bolt that secures the ground terminal of the Positive Temperature Coefficient (PTC) heater may have been improperly fastened, which could result in melting of the ground terminal and surrounding components.
A melting ground terminal increases the risk of a fire.
Owners are advised to park their vehicle away from structures and to avoid leaving the vehicle unattended while the engine is running. An owner who notices or smells smoke coming from the dash or driver's footwell area should immediately stop operating the vehicle and turn the ignition switch to the "Off" position. Dealers will replace the PTC heater ground bolts and if necessary, replace the ground wire and the connector holder, free of charge. Owner notification letters are expected to be mailed February 6, 2023. Owners may contact Subaru's customer service at 1-844-373-6614. Subaru's number for this recall is WRL-22.