2021 Subaru Ascent driver assistance problems

Filed Oct 31, 2026 · Driver assistance · ID · crash · 1 injury

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

Filed Jun 8, 2025 · Driver assistance · OR

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.

Filed Jun 5, 2025 · Driver assistance, Visibility · WI

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.

Filed Aug 13, 2024 · Brakes, Driver assistance · GA

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.

Filed Aug 8, 2024 · Acceleration, Driver assistance · TX · 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. It is unknown if this was caused by driver error in accelerating and never braking.

Filed Apr 5, 2024 · Driver assistance · PA

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!

Filed Jan 21, 2024 · Driver assistance, Steering · MD

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.

Filed Nov 30, 2022 · Acceleration, Driver assistance · MO

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 work full time and have a very sick kid so making a appointment is hard. This last time I asked if I can drop in just for a scan due to being in town for an appointment. Was met with we are backed up with way to many repairs. Also it would not be fair to any other people. It is most likely your gas cap. I have made sure the cap is tight as it can get every time from the first time it occurred. So all safety features on the Subaru Ascent just stop working if the cap is not tight. Not only is this a major safety issue their QA is asleep at the wheel. Known issue, just check the forums.

Filed May 3, 2022 · Driver assistance · CA

It is actually the lane centering system. Even a gentle hand on the wheel, which is required, will gradually pull you to one side of the lane. When ever you lift your hand or when the car thinks you have gone to far one way or the other it will throw you into the other lane, into a car, motorcycle, semi, or even off a cliff. This system is so dangerous I cant believe it hasnt been recalled. If using this you will get thrown one way or the other several times during most trips. Dealer states its normal and I got that in writing.

Filed Mar 4, 2022 · Driver assistance, Electrical · WA

My mirror on my car has started melting. They told me it was a outside force, from a lighter. I told them it was electrical or something wrong from the inside of the mirror. There are forums recently posted up regarding this and Subaru has ignored them all claiming it is reflective light from the sun. That they can’t do anything about it. Others have replaced their mirrors 3 times now. This is a potential fire hazard and could be unsafe. They are not addressing this as it should be. https://www.thesubaruforums.com/threads/melting-side-view-mirror.12397/