Phantom braking and other driver-assist complaints: what goes wrong and which models draw the most reports
How automatic emergency braking, adaptive cruise and lane keeping produce false alarms, why some models generate far more reports, what NHTSA has…
Driver-assistance systems have become standard equipment: automatic emergency braking, adaptive cruise control, lane keeping, blind-spot monitoring and, on some models, hands-free highway driving. They prevent crashes. They also generate a growing share of the owner complaints in this index, and the most common of those complaints has a name owners coined themselves: phantom braking.
What phantom braking is
Phantom braking is when the car brakes hard, or warns of an imminent collision, with nothing in the road. Owners describe it on empty highways at 70 mph, under overpasses, next to a truck in the adjacent lane, in the shadow of a bridge, at sunset facing low sun, and when a car in the next lane drifts near the line on a curve. The braking is abrupt enough that drivers behind have to swerve, and several reports in the data describe being rear-ended or nearly so. Because the system is doing exactly what it is designed to do, only in response to a phantom, there is often nothing for a dealer to find afterwards.
Why it happens
Automatic emergency braking has to decide within a fraction of a second whether an object ahead is a threat. It does so with some combination of radar, one or more cameras, and increasingly ultrasonic sensors, plus software that fuses them.
- Radar sees metal well and distance precisely but has poor resolution, so a stationary overhead sign, a manhole cover or a guardrail on a curve can look like a stopped car.
- Cameras classify objects but struggle with glare, rain, shadows and the edge cases a neural network has not seen. Camera-only systems remove the radar's cross-check.
- Fusion logic must weigh disagreeing sensors. Tuning it toward fewer missed threats produces more false alarms; tuning the other way risks missing a real pedestrian. Manufacturers move that dial with software updates, and owners notice when it moves.
Adaptive cruise control shares the same sensors, which is why "the cruise control slammed on the brakes" and "forward collision warning went off for no reason" are usually the same underlying event. Lane-keeping complaints are different in kind: owners describe the wheel tugging toward a faded line, an exit ramp or a construction barrier, and steering assist that fights them during a lane change.
What NHTSA has done
Unexpected braking is one of the areas where owner complaints have most visibly turned into regulatory action. NHTSA has opened preliminary evaluations and engineering analyses into false automatic braking on several brands' models after receiving hundreds of similar reports, and manufacturers have issued software recalls that changed how their systems interpret sensor data. A federal standard now requires automatic emergency braking on new light vehicles and sets performance tests for it, including tests meant to catch false activations. The investigations block below lists what is currently open on the models this site tracks.
What the data shows now · 2026-09-02
Share across all tracked vehicles: 5.7% · Tracked models with at least 100 complaints, ranked by the share of their complaints in this area.
| Models | Complaints · Driver-assist systems | Share of complaints | vs. all vehicles | Recent activity |
|---|---|---|---|---|
| Tesla Model Y | 1,286 | 34.3% | 5.98 | Steady |
| Tesla Model 3 | 1,312 | 31.0% | 5.41 | Rising |
| Tesla Model S | 118 | 16.7% | 2.91 | Falling |
| Honda Passport | 102 | 15.6% | 2.73 | Rising |
| Honda Odyssey | 477 | 15.1% | 2.63 | Rising |
| Ford Mustang Mach-E | 93 | 14.3% | 2.49 | Falling |
| Honda CR-V | 766 | 13.3% | 2.32 | Falling |
| Honda Accord | 533 | 12.6% | 2.19 | Steady |
Which models draw the most reports, and why
Three factors decide how many driver-assist complaints a model generates. The first is how much of the system is switched on by default and how often the car is driven at highway speed with it active; a model with hands-free driving accumulates far more sensor decisions per mile than one with a basic collision warning. The second is the sensor suite: models that dropped radar in favour of cameras, or that use an older single-radar design, show distinct complaint patterns. The third is the owner base: a large, technically engaged community files more reports per incident. The live table above shows which tracked models currently have the largest share of their complaints in this category and how that share compares with the fleet.
What to do as an owner
- Record the conditions. Time of day, weather, road type, what was nearby, and whether cruise control was active. Dealers and NHTSA both need this; the car's own event log often does not keep it.
- Ask for the software version and check for updates. Many false-braking fixes ship as over-the-air or dealer-installed software. The recall lookup shows whether one is outstanding for your VIN.
- Adjust sensitivity before disabling. Most systems allow a lower following distance sensitivity or a later warning setting. Disabling automatic emergency braking entirely removes real protection; treat it as a last resort and understand that in many models it re-enables at every start.
- File a complaint with NHTSA. Driver-assist defects are found almost entirely through complaint clusters, because the failure leaves no broken part.
What to test before buying
On a test drive, use adaptive cruise on a highway with overpasses and lane-side barriers, follow a truck around a gentle curve, and drive toward a low sun if the timing allows. Try the lane-keeping assist on a road with faded markings and an exit ramp. Then read the excerpts on the model's page: if owners of that model year describe phantom braking in the same situations you just drove through, believe them over the salesperson.