2021 Subaru Ascent Problems

Twin Falls Subaru left me in a dangerous position with my transmission failing catastrophically on the highway 72 hours after major service is a severe safety hazard My 2021 Subaru Ascent with 56,420 miles, still under the 60,000 mile/5 year warranty, went to Twin Falls Subaru with diagnostic codes P0137, and P2096 on 8/15/26 they replaced the following, the engine harness,. transmission harness, transmission pressure sensor and ecm. They said the root problem was the secondary pressure switch, Subaru of America & Twin Falls Subaru said those repairs weren’t covered under warranty and I had to pay $3000 out of pocket, SOA covered the remaining $5100. I picked it up 10/13/26, (on 10/16/26, three days later my check engine light came on along with the AT oil temp and transmission flashing on the dash, the diagnostic codes I received were P0700 P0841 P0890, Subaru Of America paid to have my vehicle towed back to the dealership where they said I needed a new transmission, but they weren’t covering it because my warranty had expired 14 days prior (on 10/2/26), during the time it was getting the first repairs done, they claimed that the two incidents had nothing to do with one another. The DPSM claims a transmission pressure switch failure that flooded the wiring harness with fluid is 'unrelated' to the transmission total collapse 72 hours later. They

Trying to turn onto the street from a parking lot the vehicle wasn't accelerating as expected and I wasn't able to turn as expected. I am taking the car in soon to be diagnosed with an issue.

I purchased a new 2021 Subaru Ascent in XXX. In XXX, at about 36,000 miles, I discovered water leaking into the cabin through the panoramic moonroof during rain and brought it to Lynnes Subaru ([XXX]) immediately. Through repeat visits and recurrences, Lynnes failed to diagnose it, blaming clogged drains. In fall 2025 they identified it, with help from a Subaru corporate regional engineer, and performed a moonroof replacement. Because I acted quickly EACH TIME water entered, there was no odor or upholstery damage at that time. Water intrusion continued in areas not visible inside the cabin (seatbelt recess). [XXX] and SOA knew right away water was still entering the vehicle. SOA told me to work with [XXX], and [XXX] had me wait for a loaner before re-examining it, because the water was not in the main cabin, headliner, etc. For over two months they set no start date, then stopped contacting me altogether. When warm weather arrived in spring 2026, a strong mold and mildew odor developed. I brought the vehicle in, loaner or not. [XXX] cleaned the drains and returned it in under two hours with the odor and mold unchanged. I was shocked they would allow, let alone instruct me to take possession of a vehicle that was a rolling biohazard! I fought with SOA to relocate the vehicle to [XXX] Subaru, a second Subaru dealer. [XXX] confirmed the water damage, mold, and improper prior work, including rear drain hoses pinched during [XXX]' reassembly. SOA authorized a goodwill repair: a second full moonroof replacement, completed around XXX, replacing moonroof, drains, headliner and carpet. On XXX, roughly five weeks after pickup, water intrusion recurred following ordinary rain, leaking into the driver-side A-pillar, and the vehicle went back to [XXX] immediately. The mold and mildew odor has never left the vehicle. Children regularly ride in this vehicle, which is currently at the dealer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

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.

2021 Subaru Ascent was involved in a serious collision with highway maintenance equipment near [XXX]. The vehicle's EyeSight Driver Assist Technology, specifically Adaptive Cruise Control and Pre-Collision Braking, is suspected of failing to respond appropriately to slower-moving equipment directly ahead. At the time of the collision, Adaptive Cruise Control was actively engaged and controlling vehicle speed. Lane Centering, Lane Departure Warning, and Lane Keep Assist were also enabled. The vehicle was traveling within its designated lane when it approached a highway maintenance truck equipped with a rear-mounted crash attenuator. The maintenance truck appeared to be moving slowly in the same lane. Despite Adaptive Cruise Control controlling vehicle speed, the Subaru did not adequately slow to avoid the collision. The driver reported no effective forward collision warning or automatic emergency braking intervention. Whether the system detected the equipment or attempted braking is UNKNOWN. The impact caused extensive front-end damage and airbag deployment. The driver was pregnant, and two children, ages [XXX] and [XXX], were passengers. All occupants and the unborn child were placed at significant risk of serious injury. Whether any EyeSight warnings, fault messages, or diagnostic trouble codes were present before impact is UNKNOWN. The suspected malfunction has not been reproduced or confirmed by a dealership or independent service center. A manufacturer engineering inspection has not been confirmed. Photographs document the accident scene and vehicle damage. The extent of police or insurance technical inspections and the vehicle's current availability for inspection are UNKNOWN. An investigation is requested into Adaptive Cruise Control, forward object detection, and Pre-Collision Braking, including preservation and review of available electronic collision data to establish why the systems did not prevent or effectively mitigate the collision. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (F

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.

After my husband replaced the 12V battery in my 2021 Subaru Ascent Touring ($90,000, fully paid off), Apple CarPlay stopped connecting via USB entirely. Android Auto and Bluetooth continued working fine on the same phone, cable, and port, proving the defect was isolated to Subaru's CarPlay system, not my device. I spent significant time and money troubleshooting this myself: multiple cables (including two labeled "Apple certified"), a full infotainment factory reset, and a software update attempt, none of which fixed it. The issue only resolved after I purchased yet another cable at my own expense, with zero meaningful help from Subaru. When I filed a formal complaint, I received a response with an appointment confirmation left entirely blank (no retailer, date, or time), which I was told was "intentional" so I could fill in my own details, shifting all scheduling and diagnostic responsibility back onto me. When I requested compensation for hours spent troubleshooting a defect that was never mine to fix, I was told plainly that no compensation exists. Shortly after, my key fob began requiring near-direct contact with the door and push-start button to register, despite a confirmed correct, brand-new battery, ruling out the simplest cause. This is a second unexplained electrical issue on the same vehicle in a short span. Subaru's support has been dismissive and apathetic throughout, repeatedly redirecting responsibility back to me as the consumer rather than taking ownership of manufacturer-level defects.

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. This sudden, traumatizing and catastrophic failure with no prior warning.

Twin Falls Subaru left me in a dangerous position with my transmission failing catastrophically on the highway 72 hours after major service is a severe safety hazard My 2021 Subaru Ascent with 56,420 miles, still under the 60,000 mile/5 year warranty, went to Twin Falls Subaru with diagnostic codes P0137, and P2096 on 8/15/26 they replaced the following, the engine harness,. transmission harness, transmission pressure sensor and ecm. They said the root problem was the secondary pressure switch, Subaru of America & Twin Falls Subaru said those repairs weren’t covered under warranty and I had to pay $3000 out of pocket, SOA covered the remaining $5100. I picked it up 10/13/26, (on 10/16/26, three days later my check engine light came on along with the AT oil temp and transmission flashing on the dash, the diagnostic codes I received were P0700 P0841 P0890, Subaru Of America paid to have my vehicle towed back to the dealership where they said I needed a new transmission, but they weren’t covering it because my warranty had expired 14 days prior (on 10/2/26), during the time it was getting the first repairs done, they claimed that the two incidents had nothing to do with one another. The DPSM claims a transmission pressure switch failure that flooded the wiring harness with fluid is 'unrelated' to the transmission total collapse 72 hours later. They

My 2021 Subaru Ascent (40,000 miles) suffered multiple major mechanical failures that pose ongoing safety concerns: 1. Engine Oil Leak: The vehicle developed an active engine oil leak at 20,000 miles, posing a risk of fluid contacting hot exhaust/engine components under the hood or causing low oil levels during operation. Repair time more than 35 days due to parts not available. 2. Loose Factory Engine Mounts: At 25,000 miles, excessive engine shifting, vibration when braking, the dealer discovered loose engine mounts. 3. Transmission Valve Body Failure: At 40,000 miles The transmission Valve Body Failure and need replacement.

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 repair performed at an authorized Subaru retailer in Texas under active powertrain warranty. That repair was supervised by a Subaru of America District Quality Manager and Field Technical Specialist, who conducted a 110-mile validation drive prior to release. Prior to the highway failure, visible fluid leaks were documented across the intake ducting, residue on lower engine components, a sweet and burning odor after driving, and milky sludge returning to the coolant reservoir — all within 125 miles of pickup. These are consistent with ongoing oil and coolant cross-contamination, which was the original diagnosis documented in the dealership's digital service portal. The vehicle has now undergone three major engine teardowns since March 17, 2026 — over 100 days out of service — for the same underlying powertrain issue on the FA24 engine. The current repair involves cylinder heads sent to a third-party machine shop. Vehicle telematics confirm the vehicle has not been started since May 27, 2026. This report is filed to establish a federal safety record of the highway power loss incident and the recurring nature of this powertrain failure. An active Subaru of America customer advocacy case is on file regarding this vehicle.

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.

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.

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 10,000.

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 occurring at the rear C-pillar (and notably cargo area and front footwells showed no moisture making this physically impossible). Despite confirmed moisture exposure to critical passive restraint systems, the dealer relays that the manufacturer has issued a verbal-only warranty denial (stating no addl records exist aside from the initial technician report) and suggest the only repair be carpet replacement, with refusal of confirmation of the source of the leak and no proposal of replacing the 2nd-row seatbelt retractors nor provide a written safety guarantee. The vehicle is covered by an active 8yr/120,000-mile Subaru Gold Plus Added Security Plan (Agreement #*******, started on 8/2/21), yet the manufacturer is refusing to honor the contract for the defect or the resulting biohazard ('mold spouts' documented by their technicians on carpeting and into the foam). This unaddressed moisture creates an unreasonable risk of internal corrosion and failure of the seatbelt G-sensor/locking mechanisms on both sides. Also as an immunocompromised owner (due to medication for multiple sclerosis to such an extent that requires monthly IVIG infusions), the documented mold is a significant health hazard. Vehicle has only 15,166 miles. Correspondence with dealer and SoA as well as agreement# are available on request. Date of incident was when taken to dealership (events in summer/fall 2025)

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.

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.

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 tires and alignment issues. I hope these tires don't fail and cause someone to lose their life.

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 repair performed at an authorized Subaru retailer in Texas under active powertrain warranty. That repair was supervised by a Subaru of America District Quality Manager and Field Technical Specialist, who conducted a 110-mile validation drive prior to release. Prior to the highway failure, visible fluid leaks were documented across the intake ducting, residue on lower engine components, a sweet and burning odor after driving, and milky sludge returning to the coolant reservoir — all within 125 miles of pickup. These are consistent with ongoing oil and coolant cross-contamination, which was the original diagnosis documented in the dealership's digital service portal. The vehicle has now undergone three major engine teardowns since March 17, 2026 — over 100 days out of service — for the same underlying powertrain issue on the FA24 engine. The current repair involves cylinder heads sent to a third-party machine shop. Vehicle telematics confirm the vehicle has not been started since May 27, 2026. This report is filed to establish a federal safety record of the highway power loss incident and the recurring nature of this powertrain failure. An active Subaru of America customer advocacy case is on file regarding this vehicle.

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.

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.

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 results or elevation. Ive tried cushions, padding and every possible seat adjustment still without any relief. I am scheduled for surgical consultation over this matter with strong possibility of surgery. There are thousands of Subaru owners throughout the web suffering from this same issue which has been medically classified by physical therapy professionals as " Subaru Sciatica Syndrome". The poorly designed seat has hard bolsters that jam into my thigh causing the sciatic pressure that causes the abnormal break pressure sensation. Therefore meeting two requirements for investigation. Subaru USA is aware of this problem and has banned me from posting anything educational on all their websites informing owners to the solution and action available. I had the seats looked at by an experienced car upholstery shop and repairs were estimated, submitted to Subaru upon their request, only to be denied.

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

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

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 tires and alignment issues. I hope these tires don't fail and cause someone to lose their life.

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 insurance company. The manufacturer was not made aware of the failure. The failure mileage was approximately 19,000.

The contact owns a 2021 Subaru Ascent. The contact stated while driving 65 MPH and attempting to accelerate, the vehicle inadvertently lost motive and failed to accelerate at intended. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the transmission, and informed the contact that the transmission was slipping. The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 75,000. The VIN was not available.

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 occurring at the rear C-pillar (and notably cargo area and front footwells showed no moisture making this physically impossible). Despite confirmed moisture exposure to critical passive restraint systems, the dealer relays that the manufacturer has issued a verbal-only warranty denial (stating no addl records exist aside from the initial technician report) and suggest the only repair be carpet replacement, with refusal of confirmation of the source of the leak and no proposal of replacing the 2nd-row seatbelt retractors nor provide a written safety guarantee. The vehicle is covered by an active 8yr/120,000-mile Subaru Gold Plus Added Security Plan (Agreement #*******, started on 8/2/21), yet the manufacturer is refusing to honor the contract for the defect or the resulting biohazard ('mold spouts' documented by their technicians on carpeting and into the foam). This unaddressed moisture creates an unreasonable risk of internal corrosion and failure of the seatbelt G-sensor/locking mechanisms on both sides. Also as an immunocompromised owner (due to medication for multiple sclerosis to such an extent that requires monthly IVIG infusions), the documented mold is a significant health hazard. Vehicle has only 15,166 miles. Correspondence with dealer and SoA as well as agreement# are available on request. Date of incident was when taken to dealership (events in summer/fall 2025)