Which parts fail
Components named in complaints (automatic and manual transmissions, CVT, axles, driveshaft, 4WD/AWD).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2020 Subaru Ascent owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2020 Subaru Ascent. The contact stated that while driving on several occasions at various speeds, the steering wheel became loose and then tightened inadvertently. The vehicle was taken to a dealer where the failure could not be replicated. The contact also stated that on several occasions while driving, the vehicle puttered and a grinding noise was heard emanating from the engine compartment. The vehicle was towed to a dealer where it was diagnosed during the first visit to be the transmission module. The vehicle was repaired, but the failure persisted sporadically. The vehicle was taken back to the same dealer on the second visit where it was diagnosed that the transmission needed to be replaced. The vehicle was repaired, but the failures reoccurred approximately 5,000 miles later. …
The contact owns a 2020 Subaru Ascent. The contact stated while driving 30 MPH, the transmission was slipping, and there was a loud sound coming from the vehicle. The contact stated that the vehicle lost motive power while accelerating. The contact was unsure if any warning lights were illuminated. The contact pulled over and left the vehicle for several hours. Upon return to the vehicle, the contact stated that the vehicle drove normally. The vehicle was taken to the dealer and an unknown module was reprogrammed; however, the failure recurred several times. The vehicle was taken back to the dealer and a diagnostic test was performed; however, the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was made aware of the failure and stated that if the failure could not be duplicated the vehicle could not be repaired. …
The contact owns a 2020 Subaru Ascent. The contact stated that upon parking on an incline, the gear shifter failed to move out of the park and excessive effort was needed to move the gear shifter. The contact also stated that an abnormal grinding sound was coming from the vehicle. Upon investigation, the contact discovered that the vehicle was included in NHTSA Campaign Number: 21V955000 (Power Train) however, the part to do the recall repair was unavailable. The dealer had been notified about the recall and confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The failure mileage was approximately 5,074. VIN tool confirms parts are not available.
The contact owns a 2020 Subaru Ascent. The contact stated that while driving at an undisclosed speed, the vehicle was skipping. The failure was recurrent. The contact associated the failure with NHTSA Campaign Number: 21V955000 (Power Train); however, the dealer informed the contact that the recall repair was completed on July 15, 2025. The contact was the vehicle owner on that date and stated that the vehicle was never taken to the dealer for the recall repair. The dealer diagnosed the vehicle with CVT failure and advised that the vehicle was outside warranty coverage. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 145,000.
The contact owns a 2020 Subaru Ascent. The contact stated that while operating the vehicle, the transmission malfunctioned, and the vehicle would not properly accelerate. The vehicle was taken to the local dealer who serviced the rear differential but later the failure reoccurred. The vehicle was taken back to the local dealer to be diagnosed, and it was determined that the transmission was faulty and needed to be replaced. The transmission was replaced. No further information was available. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 106,100.
The contact owns a 2020 Subaru Ascent. The contact stated while driving 20 MPH, there was a delay while shifting gears. There was no warning light illuminated. The vehicle was taken to the dealer and the contact was informed that the VIN was included in NHTSA Campaign Number: 21V955000 (Power Train). The recall repair was performed; however, the failure occurred several times. The vehicle was repaired several times. The manufacturer was contacted, and a case was filed but no assistance was provided. The failure mileage was 30,000.
The contact owns a 2020 Subaru Ascent. The contact stated that while his wife was driving at 55 MPH, the vehicle stalled. No warning lights illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 21V955000 (Power Train). The vehicle was towed to the local dealer where it was diagnosed that the transmission needed to be repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 62,000.
The contact owns a 2020 Subaru Ascent. The contact stated that while depressing the accelerator pedal to make a turn, the vehicle hesitated to respond. There was no warning light illuminated. The vehicle was taken to the dealer, but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 61,900.
The Transmission is slipping on my 2020 Ascent. I had the recall wrk-21 performed in July of 2025. Over the last 6 months the car has been hesitant to go at low speeds and shakes at high speeds. Over the last month the transmission started to slip while accelerating , especially up hill. There would be a grinding noise and RPMs would jump. I took it to the dealer and they confirmed it was the transmission via camera test. I called Subaru of America for goodwill help with the cost knowing that there is a know issue with the transmission. They refused due to the mileage, 121,010. What component or system failed or malfunctioned, and is it available for inspection upon request? The transmission is slipping How was your safety or the safety of others put at risk? The car is hesitant to go from a starting position. …
My car had a CVT drivetrain recall which has been labeled as "repaired" because I brought it to the dealer, however, the issue still exists and my car has been to the dealer 5 times already concerning this recall. The symptoms of the CVT drive train that I am experiencing are: shuddering (dealership vocabulary) at approximately 20 mph (approximately 1500-2000 rpm). The issue has gotten worse because now I experience the occasional shuddering at 40 mph and about 60 mph. In addition, occasionally at about 20 mph after slowing down and then accelerating there is a heavy vibration from the engine (which was heard over the phone by someone). Some things that the dealership have done included updating the computer, reflashing, reprogramming it, etc. However, as I mentioned the issue still exists and has gotten worse. …
Related recalls
Power train › Driveline › Chain/belt
Subaru of America, Inc. (Subaru) is recalling certain 2019-2020 Ascent, 2020 Legacy and Outback vehicles. A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage before the drive chain is completely clamped.
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.
Transmission complaints in other Ascent years
Frequently asked questions
How common are transmission problems on the 2020 Subaru Ascent?
NHTSA has 59 complaints about the transmission & drivetrain of the 2020 Subaru Ascent, 18% of the model year's 324 complaints. The component named most often is automatic transmission (1 mentions).
Is there a recall for 2020 Subaru Ascent transmission problems?
Yes — NHTSA recall 21V-955 (chain/belt, Dec 9, 2021). Recall repairs are free at authorized dealers.
At what mileage do 2020 Subaru Ascent transmission problems start?
Half of the complaints with a recorded mileage happened before about 25,000 miles, and 50% before 25,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.