2020 Subaru Ascent Driver assistance Problems

I am reporting a repeat safety concern involving a 2020 Subaru Ascent. The vehicle was involved in two separate collisions after failing to decelerate as expected following normal brake pedal application. The first incident occurred on January 26, 2026. While approaching a traffic signal, I applied the brakes under normal driving conditions. The vehicle did not slow as expected and struck the rear of another vehicle. Property damage occurred, but no injuries were reported. The second incident occurred on May 5, 2026. While approaching a stop sign at approximately 35 mph, I again applied the brakes under normal driving conditions. The vehicle did not decelerate as expected and entered the intersection, colliding with a vehicle traveling perpendicular to my direction of travel. Both vehicles were towed. No injuries were reported. During both incidents, there were no forward collision warnings, automatic emergency braking interventions, or other alerts observed prior to impact. Following the second collision, the vehicle was inspected by an independent technician. Brake components inspected were found to be within serviceable condition and no evidence of neglect or improper maintenance was noted. During inspection, abnormal brake pedal behavior was observed, including continued downward pedal travel while steady pressure was applied. The technician documented that the reported condition was not consistent with normal braking performance and stated that an intermittent hydraulic and/or brake assist related issue could not be ruled out. The vehicle has been regularly maintained according to manufacturer recommendations. Due to the repeat nature of the condition, the lack of warning or intervention from safety systems, and the occurrence of two collisions despite normal brake application, I believe this condition represents a significant safety risk. The vehicle has since been declared a total loss and may be available for further inspection.

NHTSA ID

11740848

Incident

May 5, 2026

I was driving and I got check engine light and all safety features disabled while I was in the freeway, luckily I was able to drive to nearby Subaru dealer for inspection and I found out that there was a recall on the engine for this vehicle and when I contacted the manufacturer they asked me to take it for diagnostics and I did that at a Subaru retailer, but the case manager told me that this recall is being completed for the previous owner of the vehicle and cannot help me with anything, which was never disclosed when I was buying the vehicle.

NHTSA ID

11726964

Incident

Feb 26, 2026

I have had my lane assist come on by its self a few times, which is very dangerous because it seems to take over and will pull on the steering wheel. I’ve also brought my car back to the dealership a handful of times to have it hooked up to a computer and also someone ride with me because the car will either hesitate to accelerate or stutters and doesn’t seem to want to go when I am between 20-30 miles an hour. Other times when I’m at a light or stop sign it hesitates also. I was told there was nothing wrong with it and they reprogrammed to transmission but it didn’t help at all.

NHTSA ID

11717228

Incident

Dec 31, 1969

Transmission failure, chugging while driving on the road then slowed down in middle of the intersection, won’t accelerate which is a unsafe situation. It says “check engine”, “break, “eyesight disabled”, “at oil temp” and “transmission”. The speed was stuck to 20mph and engine eas loud. Smelled like something was burning too

NHTSA ID

11608386

Incident

Aug 13, 2024

The contact owns a 2020 Subaru Ascent. The contact stated that while driving at an undisclosed speed, the Forward Collision Avoidance front camera became inoperable. The pre-collision, the braking control, and the Lane Departure warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed; however, the cause of the failure was not yet determined. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 19,737.

NHTSA ID

11587426

Incident

Apr 4, 2024

Mileage

19,737 mi

Right front camera is blocked by plastic since manufacture. The adaptive cruise control and forward emergency braking do not work reliably unless the object is the left visual field. My car will accelerate into a car in front with no emergency braking. No accident. so far, because I have been able to avoid accidents by braking myself. The problem was diagnosed by Diablo Subaru of Walnut Creek. The vehicle was inspected and diagnosed by a Subaru dealership. The car tells me it cannot see the car in front. It also says it cannot see anything on haphazard basis. But it will also accelerate toward cars in front of it at close range because it cannot see.

NHTSA ID

11575783

Incident

Jun 23, 2020

On Friday evening, February 23, 2024 , I pulled onto my driveway and came to a complete stop before driving into the garage . I reached up and hit the garage door remote. When the door began to go up I took my foot off the brake. Instead of creeping up the driveway the car took off like a proverbial "bat out of hell" It was as if I had pushed the accelerator compltely down.to the floor board. The brakes had no effect. I smashed through the garage door,. The car jumped a six inch concrete step up, obliterated the garage cabinets and pushed the contents of the cabinets and garage wall into our family room.The car came to a rest just outside our family room. My son opened the door to the garage and yelled out to me "Are you okay" Because the engine was still racing he said "Get your foot off the accelerator' My reply was I DON'T HAVE MY FOOT N THE ACCELERATOR". I then tuned the ignition off and the ordeal was over.. It appears that the engine continued to recieve fuel irregardless of the position of the accelerator., the automatic braking system failed miserably and the the forward collision warning was malfunctioning. I am waiting for the insurance company to remove the car from the garage and do a structural assessment.. Because there may be serious structual damage I want the insurance company to remove the vehicle less the second floor collapses onto the garage. My son was on the couch just seconds before the wall "exploded". The couch was moved eight feet across the room. If a piece of debris came through the windsield I also might have been injured. The potential for serious injury to others in another set of ircumstances also scares me. The malfunction came without warning. The damages will be in the tens of thousands of dollars. I am blessed that no one was injured or killed.

NHTSA ID

11574100

Incident

Feb 23, 2024

The vehicle hesitates like it doesn’t want to get up to speed, despite pressing the gas pedal to accelerate. The RPM needle bounces. Dealership has not been able to “replicate the hesitation I feel when accelerating.” They originally tried to say I didn’t tell them the problem was happening when it had time to warm up, which is a lie, I have all the scheduling notes made by the employee who set the appointment up. Dealership said it passes diagnostic testing despite my serious concerns as the owner driving it daily. No lights are lit up on the dashboard which is another reason why the dealership is saying everything is fine. It’s already had a firmware update in July and the dealership is very dismissive of my concerns. I made multiple calls before appointment telling them it’s happening more frequently around 20-30 minutes of drive time and to make sure I have them the full picture well enough in advance for them to make adequate time to look at my vehicle

NHTSA ID

11573056

Incident

Feb 1, 2024

CVT jerks the vehicle and stutters when at certain rpms, making long car rides very uncomfortable. Feels like whiplash every so often. Very dangerous when trying to speed up to pass another vehicle because the vehicle doesn't respond and accelerate as it should. The dealer said its normal because of the CVT technology. They said they tried to reproduce it, but were only gone 5 minutes. The highway is 5 minutes away from dealership, one-way. I explained it happens after about 20 minutes of continously driving at speeds over 50 mph. The vehicle had only been inspected once for this issue. The dealer refuses to look at it again because they, "already explained it to [me]". There are no warnings or indicators prior to it happening.

NHTSA ID

11554688

Incident

Nov 11, 2023

Since the day I bought this car anything that blows across the road causes the brakes to slam on....even at speed on the highway This is dangerous as hell. Additionally the eye sight disconnects intermittently for on reason or because of rain or a small bump in the road. You must stop and turn the car off and on to get a reset. I have had the vehicle inspected at 3 different Subaru dealerships and they all say nothing is wrong with either system. Now I have tried for 2 weeks to get a response from Subaru Customer Advocate with negative results.

NHTSA ID

11525728

Incident

Jun 6, 2023

The contact owns a 2020 Subaru Ascent. The contact stated that while driving at an undisclosed speed with the cruise control activated, the vehicle experienced phantom braking. The vehicle was taken to the dealer where it was diagnosed that the vehicle performed as designed. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 10,000.

NHTSA ID

11470269

Incident

Jun 21, 2022

Mileage

10,000 mi

Sudden unwanted rapid acceleration toward a building from parking lot causing head on collision: - Manual brakes failed - Automatic brakes did not engage - Airbags did NOT deploy after hitting an immovable object head on at least twice - Driver seatbelt did not lock - Starlink was not activated / notified - No collision warning was sounded (moot) Both driver and front passenger were severely injured and taken by ambulance to ER.

NHTSA ID

11443234

Incident

Nov 20, 2021

When applying brakes to 2020 Subaru Ascent limited (10,325 miles) the car shudders. Being an aircraft mechanic for over 45 years I knew the brake rotors were warped. I Took car to Subaru of Kennesaw GA. 7-13-2021. They opened work order SuCS159697. They resurfaced the rotors on front brakes and installed new pads. My safety concern is if brake rotor originally installed are warping and now you are removing the width of the rotor making it thinner and more likely to heat and warp sooner. When i questioned the maintenance technican about this concern he stated this was Subaru policy to resurface. Extreme heat to brakes could cause brake failure.

NHTSA ID

11424774

Incident

Jul 13, 2021

MY VEHICLE IS FAIRLY NEW 7 MONTHS TO BE EXACT. WHEN IT WAS 4 MONTHS OLD I'VE STARTED TO NOTICE RUST AND CORROSION ON THE WINDOW PANELS THAT ARE METAL. WHEN I WENT IN FOR OIL CHANGE SERVICE THEY DENY THAT THERE IS RUST AND JUST OFFERED TO POLISH IT. AT 7 MONTHS THE WINDSHIELD HAS CHIPS AND CRACKS WHICH IS ODD WITHOUT A REASON.

NHTSA ID

11386341

Incident

Jan 2, 2021

Mileage

9,800 mi

I WAS IN AN ACCIDENT 11/29 AT 9:45PM WHERE I HIT A COW. I WAS DRIVING 55 ON A STRAIGHT HIGHWAY THAT I'M VERY FAMILIAR WITH. THE COW WAS STANDING IN THE ENTIRE LANE OF TRAVEL AND I WAS ABLE TO VEER INTO THE OTHER LANE SLIGHTLY AND TOOK THE IMPACT ON THE RIGHT SIDE WHERE I DID NOT HAVE ANY PASSENGERS. THE SUBARU WAS TOTALED AND I'M NOW HAVING SEVERE WHIPLASH SYMPTOMS. I AM REPORTING THIS AS THE AIRBAGS DID NOT DEPLOY AND EVERYONE WHO HAS SEEN THE VEHICLE SAYS THEY THINK THEY SHOULD HAVE. ADDITIONALLY, I DO NOT REMEMBER MY COLLISION ALERTS BEEPING NOR THE SUBARU BRAKING FOR ME WHICH HAVE WORKED IN THE PAST. I ONLY REMEMBER HITTING THE COW AND THEN BEING COMPLETELY STOPPED WHERE WE HAD THE IMPACT.

NHTSA ID

11383041

Incident

Nov 29, 2020

Mileage

9,500 mi

A CHIP IN THE WINDSHIELD CRACKED AND SPIDERED DOWN THE WHOLE WINDSHIELD. IT HAPPENED 2 WEEKS AFTER OWNING MY NEW CAR. I'M STILL UNSURE ON WHY IT CRACKED 🤦‍♀️ THERE ISN'T A CHIP MARK OR ANY START POINT. IT'S WORRIED HOW IT JUST STARTED CRACKING. AND SINCE IT'S OVER A 1,000 TO FIX IT. IT IS STILL CRACKED. AND ANYTHING THAT REQUIRES THE EYE NO LONGER WORKS. I LOVE MY CAR BUT HATE HOW NOTHING NEEDING THE EYE WORKS.

NHTSA ID

11376697

Incident

Dec 30, 2019

Mileage

1,000 mi

VEHICLE EYESIGHT SAFETY SYSTEM (ADAPATIVE CRUISE CONTROL), LANE DEPARTURE AND ANTI COLLISION SYSTEMS DEACTIVATED WHILE DRIVING. VEHICLE BACKUP CAMERA FAILED WHILE IN REVERSE.

NHTSA ID

11309903

Incident

Feb 5, 2020

Mileage

1,200 mi