2020 Tesla Model 3 · symptom sheet
Adaptive cruise or lane keeping misbehaves
- 91owner reports
- 5,665median miles
- 1involved a crash
Newest report Jul 2, 2026 · checked Oct 2, 2026
216 of the 451 complaints on this car are about collision avoidance. 91 of those describe driver assist. Only phantom braking is reported more often on this car.
Tick what matches of 91 reports
Driver assist on other Model 3 years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2024, 2025, 2026.
What this problem usually is
These reports come from drivers whose assistance systems did something they didn't ask for. Adaptive cruise switches itself off, or brakes for a car that isn't there. Lane keeping tugs the wheel toward the line, or a "sensor blocked" message appears on a clear day. Because both systems can brake or steer, owners tend to file them as safety complaints, and NHTSA files them under speed control, lane departure or forward collision.
What got replaced
Owners who name the part that was replaced mention the software (15 reports), the camera (9 reports) and the radar (7 reports).
Recalls and investigations
2 recalls on collision avoidance cover the 2020 model year. A recall on the same system isn't always the same failure, so read the defect text.
A factory reset muted the Pedestrian Warning System (PWS) sounds.
A communication error may cause false forward-collision warning (FCW) or unexpected activation of the automatic emergency brake (AEB) system.
All 21 recalls on the 2020 Tesla Model 3, with the owner complaints on each recalled system
NHTSA investigations into collision avoidance on the Model 3
Sudden unintended acceleration. Open.
Unexpected brake activation. Closed jun 29, 2026.
When it happens
The middle half of failures fell between 1,080 and 26,498 miles, from the 8 reports that gave a mileage.
What owners wrote
“While in cruise control the car baraked excessively on a straight 4 lane divided highway even though there was no other vehicles in front, to the side or coming on the opposite direction. This happened on 101 north of Paso Robles”
Filed Oct 26, 2022
“Autopilot regularly will panic brake (phantom brake) it also will often randomly change the set cruise control speed from 70 to 35 or from 75 to 35. This is a dangerous system that should not be allowed on the road.”
Filed Jun 12, 2022
“My car when passing under signs or on two lane undivided roads will hit the brakes very aggressively. Itâs difficult to reproduce and catches me and other drivers by surprise. The car didnât do this during my first year of ownership, but now it happens several times a week. This will happen when using cruise control and autopilot. To me itâs rendered both features unusable.”
Filed Jun 5, 2022
“The car suddenly brakes when the accommodative cruise control or full automatic driving is engaged. This happens at random times when driving on the highway. The braking is sudden and severe requiring driver intervention. Only happens with cruise control or full auto. Has happened several times since the car was purchased.”
Filed Jun 5, 2022
Should you keep driving it?
This page can't tell you that. 1 of 91 reports involved a crash and 1 people were hurt. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Paid for this repair before a recall covered it? How recall reimbursement works
Other problems on this car
- Brakes on its own (automatic emergency braking) 95 reports
- Infotainment, screen or backup camera fails 50 reports
- Brakes grind, pulse or wear early 48 reports
- Suspension noise, struts or alignment 46 reports
- Seat belt or seat problems 33 reports
- Airbag warning light or recall 30 reports
- Full Self-Driving (FSD) does something unsafe 27 reports
- Forward collision warning goes off or the camera drops out 25 reports