California Lemon Law for False Forward Collision Warnings

False forward collision warnings can turn a routine drive into a stressful experience. If your car flashes “Brake!” with no obstacle ahead, slams on the brakes unexpectedly, or constantly chimes at freeway speeds, you may be dealing with an advanced driver-assistance system (ADAS) defect. In California, repeated false alerts can be more than an annoyance—they can affect safety, reduce the value of your vehicle, and potentially trigger protections under the California Lemon Law. The overview below explains how the law may apply and what steps to take if the problem won’t go away.

How CA Lemon Law Applies to False Forward Collision Warnings

False forward collision warnings (FCW) often show up as phantom alerts, abrupt “phantom braking,” or a flashing collision icon when the road is clear. These issues can stem from miscalibrated radar or cameras, software bugs, or sensor obstructions and wiring faults. Beyond being irritating, recurring false alerts can cause a driver to lose trust in the vehicle, brake suddenly in traffic, or overreact to constant chimes—real risks that go to the heart of a car’s safety and value.

California’s Lemon Law (the Song-Beverly Consumer Warranty Act) generally covers new and certain used vehicles sold or leased with a manufacturer’s warranty. To qualify, a defect must arise during the warranty period, be covered by the warranty, and the manufacturer (through its authorized dealer) must be given a reasonable number of attempts to fix it. If the defect substantially impairs the vehicle’s use, value, or safety and can’t be repaired after those reasonable attempts, you may be eligible for legal remedies. California also has a “presumption” that can make claims easier to prove within the first 18 months/18,000 miles in certain circumstances—such as multiple repair attempts for the same issue or 30+ total days out of service—but cases can still succeed outside that window depending on the facts.

With FCW issues, the key question is whether the problem materially affects use, value, or safety. Frequent false alerts, repeated phantom braking, and persistent warning lights after multiple repair visits can support that the defect is substantial. Documentation matters: repair orders, dealership notes, videos of warnings, and service bulletins or recall notices can all help show the pattern. Every case is unique, and outcomes vary; remedies under the law can include a repurchase, replacement, or a cash settlement, but only a case-specific evaluation can clarify options.

Steps if Forward Collision Warnings Persist in CA

Start by scheduling service with an authorized dealership as soon as the issue appears. Describe the symptoms clearly—speed, weather, road conditions, frequency—and ask the advisor to note “customer states false forward collision warnings” or “phantom braking” on the repair order. Keep copies of every repair order and invoice, including any diagnostic codes, software updates, calibrations, or sensor replacements. If it’s safe to do so, short videos of the alerts can help your technician reproduce the concern. You can also check for recalls at NHTSA.gov/recalls and ask about technical service bulletins (TSBs) related to ADAS.

If the warnings continue, return to the dealer and request further diagnosis. Ask whether the radar/camera calibration was performed per the manufacturer’s procedure and whether newer software updates or TSBs have been released. If the vehicle remains at the dealer for days, request documentation of “days out of service” and ask about a loaner or rental coverage per your warranty. Consider opening a case with the manufacturer’s customer-care line to obtain a case number, and keep notes of all calls and dates.

When repeated attempts don’t resolve the problem, consider a consultation about your rights under California’s Lemon Law. Some manufacturers offer arbitration programs; whether that’s a good option depends on your situation. Deadlines and eligibility can be complex, and fee-shifting rules may apply in California if you prevail, which is one reason consumers often seek help. A consultation with a lemon law attorney can help you understand potential next steps—without committing you to any particular action.

Repeated false forward collision warnings aren’t just annoying—they can undermine safety and confidence in your vehicle. California law may offer protections if the defect persists despite reasonable repair attempts, but every situation is fact-specific. This article is for informational purposes only, is not legal advice, and reading it does not create an attorney–client relationship. Results depend on many factors and cannot be guaranteed.