Start with the records. Repair orders, warranty documents, mileage, and days out of service are more useful than general assumptions about whether a vehicle qualifies.
When a Forward Collision Warning (FCW) system glitches—firing constant false alarms, failing to warn when a crash is imminent, or cycling through “sensor blocked” messages—it’s more than an annoyance. It’s a safety concern that can undermine your confidence behind the wheel. If you’re in California and your FCW issues keep coming back despite trips to the dealership, you may be wondering how the state’s lemon law might apply. Below, ZapLemon explains the basics in plain language so you can better understand your rights and next steps.
California Lemon Law: Forward Collision Warning Failures
Forward Collision Warning is part of your vehicle’s advanced driver-assistance systems (ADAS). It uses cameras, radar, or both to detect objects ahead and alert you if a crash seems likely. When FCW fails, you might see no alert when traffic suddenly stops, get repeated false warnings in open roads, or notice the system turns off unexpectedly with a “camera unavailable” or “sensor blocked” message. FCW often works alongside Automatic Emergency Braking (AEB), so a problem in one system can affect the other.
California’s lemon law (the Song-Beverly Consumer Warranty Act) protects consumers when a vehicle has defects covered by the manufacturer’s warranty that the manufacturer or its authorized repair facility cannot fix after a reasonable number of attempts. The law can apply to new vehicles and certain used vehicles that are still under the manufacturer’s warranty. While the law doesn’t set a single magic number for repair attempts, California has a “presumption” guideline—often referenced as 18 months/18,000 miles—that may help in some cases, and safety-related defects may require fewer attempts. The specifics depend on your facts and timing.
For FCW issues, what matters is whether the defect substantially impairs the vehicle’s use, value, or safety, and whether the manufacturer has had a fair opportunity to repair it. Recurring FCW malfunctions—like no warning in stop-and-go traffic, frequent false alarms that cause you to brake suddenly, or systems that shut off randomly—can raise safety concerns. If the problem qualifies and the manufacturer can’t fix it, possible remedies under California lemon law may include a repurchase (buyback), a replacement vehicle, or a cash settlement to keep the car. Deadlines and offsets can apply, and every case is unique, so a consultation is important for guidance tailored to your situation.
What to Do: Repairs, Records, and Next Steps
Start with clear, consistent repair attempts through an authorized dealership. Describe exactly what you’re experiencing: missed alerts at highway speeds, false alarms on empty roads, or warnings that only happen in rain or at night. Ask the dealer to check for software updates, technical service bulletins (TSBs), sensor alignment and calibration (especially after windshield, bumper, or body work), and known issues affecting your model. If your vehicle recently had a windshield replacement, insist on a camera calibration check—misalignment is a common cause of ADAS faults.
Document everything. Keep copies of all repair orders, invoices, and diagnostics, including any DTCs (diagnostic trouble codes) and calibration reports. Note dates, mileage, weather conditions, road type, and what you were doing when the FCW behaved incorrectly. If safe, capture short video clips or dashcam footage showing false alerts or a failure to alert. Make sure the service writer lists your FCW complaint on the repair order in your own words—vague entries like “customer states warning issue” are less helpful than “FCW fails to alert when traffic stops; AEB unavailable message appears.”
If the problem continues after multiple visits, consider escalating. You can open a case with the manufacturer’s customer care line and ask for a field technician review. Some automakers offer arbitration programs—participation may be optional and timelines vary. Because lemon law cases turn on details, many consumers find it useful to speak with a California lemon law team about their options. ZapLemon can review your repair history, help you understand whether your FCW issue might meet the legal standard, and explain potential paths forward. A consultation is necessary to receive legal advice tailored to your facts.
This article is for informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship, and results vary based on the facts of each case. Attorney advertising. If you believe your vehicle may qualify as a lemon due to Forward Collision Warning failures, contact ZapLemon for a consultation at zaplemon.com. We’re here to help you understand your rights and next steps.
Need a case-specific review?
Use the case-review form to share the warranty, repair orders, dates, mileage, and supporting facts an attorney would need to evaluate, or call (844) 927-5366.
Attorney advertising. General information is not legal advice and does not create an attorney-client relationship. No result is promised or guaranteed.