What are the most common problems on the 2021 Subaru Ascent?

NHTSA has 100 owner complaint(s) on record for the 2021 Subaru Ascent. Power Train is the most-reported problem area on the 2021 Subaru Ascent, cited in 18 of 100 filed complaints (18%).

Problems › Subaru › 2021 Ascent

2021 Subaru Ascent Problems & Owner Complaints

100 NHTSA owner complaints

3 crash 1 fire 3 injury

Age-normalised, this year draws ~16.7 complaints per year on the road — ranking 3 of 6 Subaru Ascent years we track (1 = most complaints per year).

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What owners report

Power Train is the most-reported problem area on the 2021 Subaru Ascent, cited in 18 of 100 filed complaints (18%).

Electrical System is next (17 complaints, 17%), followed by Lane Departure (15), Visibility/Wiper (14), Engine (12).

Across all complaints, 3 report a crash, 1 report a fire, 3 report injuries.

The most safety-critical cluster is Forward Collision Avoidance: 1 crash, 1 injury report(s).

Complaints by vehicle system

Owner complaints filed with the U.S. NHTSA for the 2021 Subaru Ascent, grouped by the vehicle system each cites. A single complaint can name more than one system, so the group totals can add up to more than 100.

Power Train 18

“The contact owns a 2021 Subaru Ascent. The contact stated that while driving at an undisclosed speed, the vehicle started to stall, and the transmission failed to properly operate. The vehicle was pulled over to a nearby shop and was advised to take the vehicle back to the facility that performed the oil changes. Several days later, the contact's husband test drove the vehicle and was able to duplicate the failure. The vehicle was towed to a dealer to be diagnosed, and metal shavings were found in the oil. The dealer determined that the CVT transmission needed to be replaced. The vehicle was…”
NHTSA complaint #11752723, 2026

“I am submitting this complaint regarding a 2021 Subaru Ascent that I purchased new from Herb Gordon Subaru in Maryland. The incident occurred while driving on I-95 at approximately 75 mph with my family, including children, in the vehicle. The vehicle experienced a sudden and complete powertrain failure without any prior warning indicators. This created an immediate and serious safety risk on a busy highway. Fortunately, we were able to safely maneuver the vehicle out of traffic and avoid a collision. Prior to this incident, the vehicle had undergone regular maintenance, and there were no indi…”
NHTSA complaint #11731955, 2026

“Issue 1: Complete transmission failure was diagnosed by Subaru dealer March 24, 2026 at 5 years and 6 months after purchase with an odometer reading of 45,000 miles (drive train warranty 5 yrs/60,000 miles). Had to purchase and have installed a rebuilt Subaru transmission. First noticed transmission was slipping with a large load in vehicle May 2025 at 4 years and 8 months after purchase at about 40,000 miles on odometer. The issue was subsequently not noticed under typical load until slipping transmission signs reappeared December 2025. Made appointment in March 2026 due to a planned t…”
NHTSA complaint #11729610, 2026

Electrical System 17 1 fire

“While driving my Subaru Ascent, a check engine warning light appeared on the dashboard. Shortly afterward, I noticed smoke coming from the engine compartment. I immediately pulled over and turned the vehicle off. Within moments, flames began coming from under the hood. The fire spread rapidly, and within 5-10 minutes the entire vehicle was fully engulfed in flames. The fire originated from the engine compartment. The vehicle was a total loss. Subaru of America was notified on 12/23/2025, but no follow-up or update on investigation has been responded. The vehicle was always serviced with Subaru…”
NHTSA complaint #11712180, 2025 · fire

“The transmission on our 2021 Subaru Ascent is slipping and failing to accelerate, RPMs reving, and every issue indicator notification light is on. We took the car to our mechanic, then to the Subaru dealership service dept for diagnosis. A full transmission replacement is required plus associated repairs for a cost of $14,543.98. Service estimate attached. This repair is more than 2/3 of the value of the vehicle. This make/model and transmission type have documented problems and Subaru has previously issued an extended warranty on other model years for this same transmission issue. We are…”
NHTSA complaint #11710776, 2025

“I bought a 2021 Ascent - Touring , lately there was an ever increasing amount of wind noise. It sounded like it was coming from the sunroof, but I couldn't see anything from the inside that looked out of place and there were no signs of water leaking. I finally looked up on the roof from the outside and the weather stripping along the back of the sunroof was coming out. The glue is thin, and didn't even stick to it anymore.. This is an ongoing issue. There are people people on the Subaru Ascent, Facebook Reddit forms that have said they are having the same issue..”
NHTSA complaint #11707846, 2024

Lane Departure 15

“The lane assist failed by over correcting while I have my hands on the steering wheel. It over corrects to the center lane when you are driving with normal behavior. This can cause a collision if it were to over correct while a car was there, this is also easily reproducible in my car.”
NHTSA complaint #11665581, 2025

“I have a 2021 Subaru Ascent that falls under an extended warranty regarding the windshield due to a faulty windshield. My windshield has cracked, reduce visibility, and does not allow the forward collision warning to work properly. Subaru recognizes the faulty windshield and refuses to remedy the issue. I question the safety and integrity of this windshield to protect from normal road debris strikes, allow normal visibility, and the integrity of the lamination of the from windshield in the event of a collision.”
NHTSA complaint #11665178, 2025

“Vehicle drifts on the highway and pulls hard to the left, which is a very concerning safety issue. I have already taken the vehicle to the dealer; they did a calibration of the eyesight. The problem still persists, especially when driving the vehicle on the highway. This has almost pulled me into traffic on a few occasions!”
NHTSA complaint #11581306, 2024

Unknown Or Other 15 1 injury

“April 25, 2022: The trunk/liftgate of the vehicle failed to detect an obstruction and closed without retracting when it came in contact with an individual's head. The impact caused a head injury, blackout, and concussion, and resulted in permanent damage to an individual (6' 2" - 190lbs). Subaru’s stated that an inspection of the vehicle was performed on May 19th and informed me that “the vehicle is operating as designed…and has met all federal specifications,” and that their inspection concluded that this is “no manufacturing defect.” Prior to the inspection, Subaru requested signed consent…”
NHTSA complaint #11466358, 2022 · 1 injury(ies)

“2021 Subaru Ascent (VIN#***). Water found dripping down both second row seatbelts on multiple occasions during or following heavy rain, accumulated into mold growth on the carpet in front of second row seats to the front of the 3rd row seats (cargo area dry, front footwells dry). Authorized Subaru dealer technician report (dated 10/29/25 and 12/3/25 copy pasted into email) explicitly documents 'condensation build up on the interior of roof (seat belt area)' due to unlocated water intrusion. The dealer attributes this to 'leaf debris' in the front cowl area and rear hatch hinge despite the leak…”
NHTSA complaint #11714272, 2025

Visibility/Wiper 14

“Windshield randomly became extremely hazy in one section to the point where Eyesight forward facing obstacle detection turned off. Cerium oxide rubbing compound was required to clear the haze enough for Eyesight to work again. Other sections have less significant haze. It appears to be hairline cracks in the outer layer of the windshield or the windshield scratches extremely easily without any obvious debris impacting it.”
NHTSA complaint #11525262, 2023

“Windshield started cracking and crack doubled in size within a few hours, we did not hear a rock chip the window and don't know where the crack came from. Car is available for inspection. This is a safety issue as it can impede the drivers clear view of the road. Will call dealer Monday to have windshield replaced. The windshield has not been inspected by manufacture or insurance. Did not see any warnings prior to failure.”
NHTSA complaint #11523043, 2023

Engine 12 1 fire

“Oil leaking from upper and lower oil pan. Oil seeping from head gasket and CVT chain pump cover. RTV sealant failure. $4800 to repair. Subaru needs to solve these oil leak issues. Leaking oil is bad for the environment and engine failure could cause accidents and injury.”
NHTSA complaint #11749720, 2026

“On May 14, 2026, while driving a 2021 Subaru Ascent (approx. 94,291 miles) on a Texas expressway at highway speed during rush hour, I experienced a sudden and significant loss of engine power. There were no warning lights, no safety system activation, and no advance indication of the failure. The vehicle decelerated abruptly with traffic behind it. Live OBD-II data was being logged during the drive and was provided to the service advisor at the authorized Subaru retailer. This incident occurred only 3 days and approximately 125 miles after the vehicle was returned following a major engine rep…”
NHTSA complaint #11746580, 2026

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Service Brakes 9

“Oil leak from engine constantly from FRONT DIFFERENTIAL, rec cvt pump reseal with new trans seal, pump is leaking causing drips ; drain plug is also leaking. Need to Replace Front and rear Pads & Rotors at 35k miles which is unheard of. Accessed by suberu dealership.”
NHTSA complaint #11689564, 2025

“Brakes shudder and fade when slowing down from highway speeds. Subaru has issued many "fixes" but it keeps happening. See most recent "Ascent Front Brake Warranty Extension Coverage" it still has not fixed the problem!”
NHTSA complaint #11616364, 2024

Forward Collision Avoidance 7 1 crash 1 injury

“The driver was driving into a parking lot preparing to park, when the vehicle accelerated and started going forward at a higher speed. The vehicle struck a parked vehicle, then travelled across the parking lot, over curbs, a grass median, landscaping, and struck a rock building at a high rate of speed, causing a partial collapse of the wall. The vehicle is available for inspection through the insurance company. No analysis of data was done and nothing was inspected. There were no symptoms of the problem beforehand. The vehicle has automatic emergency braking, but it evidently didn't operate…”
NHTSA complaint #11607255, 2024 · crash · 1 injury(ies)

“I was driving along with no traffic in front of me and no oncoming traffic when the automatic braking system engaged with no vehicles in front of me, this was at 7:42 AM on Monday August 12, 2024. This was not the first time it had done this, but the first time I had the time and no traffic anywhere around to confuse the system. My concern is that if another car was following too closely they would have hit me since there was no reason for the emergency breaking system to engage.”
NHTSA complaint #11608140, 2024

Steering 7 1 crash

“The contact owns a 2021 Subaru Ascent. The contact stated that while the daughter was driving approximately 20 mph and making a slight right turn, the steering wheel did not respond and the vehicle drifted to the left and crashed into the guard rail. Prior to the incident the driver indicated the steering wheel felt wobbly and unstable. There were no injuries reported. The police was called to scene and the vehicle was towed away. No further information was available. The cause of the failure was not determined. The manufacturer and local dealer were not notified. The failure mileage was 10,00…”
NHTSA complaint #11459011, 2022 · crash

“Vehicle wanders on the highway and pulls hard to the left, which is a very concerning safety issue. I have already taken the vehicle to the dealer, did an alignment and took it back a month later because the issue persisted. The problem persist, specially when driving the vehicle on the highway. I am really concern about my family safety and the safety of others in the road.”
NHTSA complaint #11566809, 2023

“On several occasions while using the lane centering feature, vehicle has taken a sudden violent move to the left into the on coming lane. No warning lights illuminated. Problem hasn’t been replicated by dealer.”
NHTSA complaint #11433026, 2021

Structure 7

“The windshield on the 2021 Subaru Ascent is dangerous because it chips extremely easily. I purchased the car new in 2021 and since then I have had 7 rock chips (in all different states (TX, CA, WA) and driving conditions/speeds/roads). In the 4 years since I have owned it I have had the windshield replaced twice so I am on my 3rd windshield. Each time the rock hits, it causes a large chip to form which distracts the driver momentarily. It also creates defects in the windshield which could lead to safety issues of the windshield shattering.”
NHTSA complaint #11652894, 2025

“Lift gate began malfunctioning going up and down on its ownthen dropped suddenly onto spouse's head. Now the lift gate does not open properly.”
NHTSA complaint #11594745, 2024

Visibility 3

“The contact owns a 2021 Subaru Ascent. The contact stated that while his wife was repositioning the rear-view mirror, the front windshield cracked without impact and extended approximately 7-inches. The cause of the failure was not yet determined. The manufacturer and local dealer were not notified of the failure. The failure mileage was 32,000.”
NHTSA complaint #11533494, 2023

“The contact owns a 2021 Subaru Ascent. The contact stated that after the vehicle was parked in the garage, the contact returned to the vehicle and noticed a crack on the windshield. The crack was on the lower driver’s side of the windshield and moving upward. There was no impact to the windshield to cause the fracture. The vehicle was taken to the dealer but was not yet diagnosed. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 3,141.”
NHTSA complaint #11435019, 2021

“TL* THE CONTACT OWNS A OWNS A 2021 SUBARU ASCENT. THE CONTACT STATED THAT WHILE DRIVING AT MID LEVEL SPEED, THE CONTACT HEARD AN ABNORMAL NOISE COMING FROM THE WINDSHIELD. UPON INSPECTION, THE CONTACT NOTICED THAT A CRACK HAD INFORMED ON THE DRIVER'S SIDE WINDSHIELD RIGHT ABOVE FRAME. OVER TIME, THE CRACK EXTENDED FROM THE DRIVER'S SIDE TO THE MIDDLE RIGHT BELOW THE REAR VIEW MIRROR. THE CONTACT STATED THAT THE CRACK OBSTRUCTED HER VISION WHILE DRIVING. THE CONTACT CALLED SPORT SUBARU SOUTH (9951 ORANGE BLOSSOM TRAIL, ORLANDO, FL 32837) WHERE THEY INFORMED HER THAT THEY WERE UNABLE TO SERVICE…”
NHTSA complaint #11387201, 2021

Fuel/Propulsion System 2

“Unknown. I am smelling gasoline in the cabin of the car. A LOT of fumes fill my garage when I start the car. The car sometimes accelerates when I put it in park, resulting in more fumes. Fuel efficiency is lower than expected as well.”
NHTSA complaint #11442758, 2021

Tires 2

“P245 / 50 R 20 OEM Falken Tires need to be replaced with only 20K miles, even when all the maintenance was applied (rotation, inflation control, etc). Subaru dealer recognized that the problem was communicated with HQ in Japan, but still not answer”
NHTSA complaint #11538356, 2023

“OEM tires that came with original vehicle purchase depleted tread and needed to be replaced by 38,000 miles. Alignment may have been bad from initial manufacturing but is no longer covered by "bumper to bumper" warranty because it is 2,000 miles over warranty. Tire size 245/60R18”
NHTSA complaint #11525261, 2023

Vehicle Speed Control 2 1 crash 1 injury

“Adaptive Cruise Control, Automatic Emergency Braking, Forward Collision Warning, Lane Departure Warning, Lane Keeping Assistance, Eye Sight, RAB, some ! Symbol, and check engine light are all on and not working. You know everything that makes a Subaru. This is not the first or even second time. We are on the fourth instance of this happening. We live 2+ hrs away from the closest dealers. The first few times it occurred, we called to make a appointment. Each time was always a few weeks out and the issue would clear a day or two before. This last time has been going on for 6 weeks. We both wo…”
NHTSA complaint #11495560, 2022

Wheels 2

“2021 Subaru Ascent with 15,735 miles on it with the factory Falken tires. The tread and metal was showing and separating from the tires. 2 tires, original to the car off the lot. Tires should last 30-40-50 miles. The other 2 tires were labeled as a 4-5 category. The car did not steer to the left or right, no noise at all. If driving on the highway and 2 tires failed, I could have been injured, my passengers or another vehicle crash. This was very dangerous. In going to the Subaru website and seems hundreds of other customers had the same issue. Failing, inferior, defective Falken tire…”
NHTSA complaint #11535879, 2023

Air Bags 1 1 crash 1 injury

“The contact owns a 2021 Subaru Ascent. The contact stated that while making a left turn at approximately 5-10 MPH, another vehicle ran a red light and crashed into the front passenger's side bumper. The air bags did not deploy. The contact's chest struck the steering wheel, resulting in a fractured sternum. Medical attention was received. A police report was filed. The vehicle was first towed to the police impound lot, then to a body shop. The dealer was made aware of the failure and referred the contact to the manufacturer. The vehicle was not repaired and was not deemed totaled by the insura…”
NHTSA complaint #11580921, 2024 · crash · 1 injury(ies)

Seat Belts 1

Seats 1

“Purchased 2021 Subaru Ascent Limited outright, drove it for few months, started having pain in my right thigh that resulted in cramping and severe discomfort which affected my ability to feel the break pressure. This nearly ended up causing a couple of near miss rear end collisions. The pain got so bad that it caused me to lay prone and apply muscle cream to the affected area then remain prone for like 15 minutes before being able to continue driving until the pain returns. I consulted my Doctor and went through all the hoops to get an MRI, steroids, pain meds, heating pads, etc, without resul…”
NHTSA complaint #11469490, 2022

Suspension 1

Tether 1

“I am a CPST. I use the Joie Mint Latch with my own child. On multiple occasions I have found on multiple occasions that when securing the lower rigid latch it will flip to green (secure) when it is not actually latched. It is during install when "jiggling" it into position. I am concerned parents who arent as well educated on car seats may not double check the latch before traveling and their child may not be safe.”
NHTSA complaint #11728594, 2026

How we read this (methodology)

How to read this: raw complaint totals are not a clean reliability score — a model year with more cars sold, or simply more years on the road, accumulates more complaints regardless of how good it is. So this page leans on two signals that are not distorted by sales volume: the share of complaints falling on each vehicle system (the breakdown above) and NHTSA's own crash / fire / injury / death flags. When we compare model years of the same model, we normalise by years on the road (complaints ÷ vehicle age) rather than comparing raw totals. Age-normalised, the 2021 Subaru Ascent draws about 16.7 complaints per year on the road, ranking 3 of 6 among the Subaru Ascent model years we have ingested (1 = most complaints per year on road).

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Data source: U.S. NHTSA (nhtsa.gov). SaveVIN surfaces public recall data and is not affiliated with or endorsed by NHTSA.