There are 6 owner-reported driver assist & adas complaints for the 2021 Subaru Ascentin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
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!
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.
The car constantly over-corrects when it tries to keep me centered in a lane on the highway. It always over-corrects to the left shoving me to the left into the adjoining lane, and potentially side swiping vehicles in the adjoining lane. It never over-corrects to the right. I reported this to the dealer and I was told that this is normal.
The lane keeping assist pull abruptly into the other traffic lane when traveling on the highway for example when on a 4 lane road with two lane in the same direcstion and passing a semi truck the steering assist abruptly pulls the car into the truck's lane and requires immediate hard handed reaction to keep the car from hitting the truck. The lane assist on this subaru vehicle is more dangerous than it is helpful. Subaru is terribly un response to request for help although the car is less than 1-year old and has a mult-year extended warranty---subaru's customer service is the worst we've experienced. BTW my son's Honda Acura's lane assist is excellent!
LANE ASSIST WITH CRUISE CONTROL OVER CORRECTS. ON MULTIPLE OCCASIONS WHILE ON THE FREEWAY USING CRUISE CONTROL THE LANE ASSIST PULLED ME INTO THE OTHER LANE INTO OTHER VEHICLES. I HAVE ALMOST HIT TWO OTHER VEHICLES. THE PULL IS TOO STRONG AND CROSSES LANES. I HAVE TO KEEP IT OFF. FORWARD COLLISION DOES NOT ENGAGE.
THE LANE ASSIST FEATURE (ONLY AN OPTION WHEN USING ADAPTIVE CRUISE CONTROL; NOT THE SAME AS LANE CENTERING WHEN NOT USING THE ADAPTIVE CRUISE CONTROL [THE BASICS LANE CENTERING WORKS JUST FINE]) SEEMS OVERLY AGGRESSIVE. EACH TIME I HAVE USED LANE ASSIST WITH CRUISE CONTROL, IT JERKS THE CAR VERY ABRUPTLY AT TIMES, ALMOST TO THE EXTENT OF SENDING IT INTO ANOTHER LANE IF I DO NOT INTERVENE. I NO LONGER FEEL SAFE USING LANE ASSIST, SO I TURN IT OFF WHEN USING CRUISE CONTROL. I AM VERY CONCERNED IT'S GOING TO CAUSE AND ACCIDENT. THIS HAS HAPPENED AT LEAST 5 TIMES NOW WHILE DRIVING ON THE FREEWAY (EVERY TIME I HAVE ATTEMPTED TO USE LANE ASSIST).
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026