Advanced Driver Assistance Systems (ADAS) are supposed to make driving safer, but false alerts—like phantom braking, constant collision warnings, or erratic lane-keep nudges—can have the opposite effect. If your car’s tech keeps crying wolf, you’re not alone, and you may be wondering how California’s Lemon Law interacts with software-heavy defects. This article explains, in plain language, how ADAS false alerts fit into California Lemon Law basics and offers practical steps to build a useful record of issues and repairs. This information is general and not legal advice.
ADAS False Alerts and California Lemon Law Basics
ADAS includes features like forward collision warning, automatic emergency braking, lane-keep assist, blind-spot monitoring, and rear cross-traffic alerts. False alerts happen when the system triggers warnings or actions that don’t match reality—for example, sudden braking on a clear highway, continuous beeping when no car is nearby, or “camera blocked” messages under normal conditions. These issues can be frustrating, and in some cases, they can affect safety, confidence, and the basic use of the vehicle.
California’s Lemon Law (the Song-Beverly Consumer Warranty Act) generally applies to new vehicles—and some used vehicles still under the manufacturer’s warranty—that have defects the manufacturer can’t fix within a reasonable number of attempts. The key concept is a “nonconformity”: a problem covered by warranty that substantially impairs the vehicle’s use, value, or safety. Persistent ADAS false alerts may qualify as a nonconformity if they meaningfully affect how you drive, your safety, or what the car is worth, but each situation depends on specific facts, documentation, and warranty terms.
There’s also a legal “presumption” period in California (sometimes called the Tanner presumption) that can help in certain cases: generally, if the problem occurs within the first 18 months or 18,000 miles and the vehicle has either two or more repair attempts for a defect likely to cause death or serious injury, four or more attempts for the same issue, or 30 cumulative days out of service, the law may presume the vehicle is a lemon. That said, outside that window you may still have rights—it simply becomes more fact-specific. ADAS problems often involve software updates, sensor calibrations (especially after windshield or bumper work), and technical service bulletins, so it’s important to track how often the manufacturer or dealer attempts to fix the issue and what they do each time.
How to Build a Record of ADAS Alerts and Repairs
Start a simple log the moment the false alerts begin. Include the date, time, mileage, speed, weather, road type, and what happened (for example, “phantom braking at 65 mph on I‑5 in clear weather; no vehicle ahead”). Photos or short videos of the instrument cluster or alert messages can help illustrate what you experienced—only if it’s safe to do so. If your vehicle app or infotainment system lists software versions, note those before and after any update.
Each time you visit the dealer, request a written repair order both when you drop off the vehicle and when you pick it up. Make sure the service advisor accurately describes your complaint in your own words (e.g., “automatic emergency braking engages with no obstacle”) and lists all diagnoses, software flashes, calibrations, and parts replaced. If the dealer says “no problem found,” ask that this be written on the repair order anyway, and keep copies of everything, including loaner car or rental records, because days out of service can matter.
Stay alert to pattern evidence. If the problem returns after a software update, note whether the version changed. If the issue worsens in rain, bright sun, or at night, record that. Ask the service department whether any technical service bulletins (TSBs) or recalls apply to your VIN, and whether camera or radar calibrations were completed after windshield or body work. Avoid disabling safety features as a “permanent fix,” and check your warranty booklet for coverage and owner responsibilities. If the issue continues after multiple attempts, consider contacting ZapLemon to discuss your options and next steps.
ADAS false alerts can undermine both safety and confidence, and when they persist despite reasonable repair attempts under warranty, California’s Lemon Law may provide remedies. The outcome in any case depends on the details—your repair history, documentation, warranty status, and how the defect affects use, value, or safety. Keep thorough records, communicate clearly with the dealer, and get informed about your rights.
This post is for informational purposes only, is not legal advice, and does not create an attorney-client relationship. Results are not guaranteed; every situation is unique. If you believe your vehicle may qualify as a lemon, contact ZapLemon at (310) 489-3017 or https://zaplemon.com to request a consultation.