California Lemon Law for Forward Collision System Failures

When a car’s forward collision system doesn’t work right, everyday driving can become stressful or even dangerous. False alarms, sudden “phantom braking,” or a system that fails to warn or brake when it should are more than annoyances—they can be defects. If you live in California and your vehicle is still under the manufacturer’s warranty, the California Lemon Law may offer remedies when the dealership can’t fix these issues after a reasonable number of attempts. The overview below explains how forward collision systems fail, what to watch for, and how California’s lemon law could apply. This information is educational only; for advice about your situation, please contact ZapLemon.

Forward Collision System Failures Explained

Modern forward collision systems typically include forward collision warning (FCW) and automatic emergency braking (AEB). Using cameras, radar, and sometimes lidar, the system is designed to detect vehicles or obstacles ahead, alert the driver, and, if needed, apply the brakes to reduce or avoid a crash. These advanced driver-assistance features have become standard on many models, making their proper operation a core safety expectation.

Common symptoms include frequent false warnings, unexpected hard braking with no obstacle present, delayed or missing alerts, or messages like “Front Sensor Blocked” or “Driver Assist Unavailable.” Some owners experience recurring warning lights, software error codes, or a system that works only intermittently—especially in rain, bright sun, or at night. While occasional alerts can be normal, repeated malfunctions across different conditions often signal a defect rather than user error or weather alone.

Failures can stem from misaligned sensors after minor bumps or windshield replacements, dirty or faulty cameras, wiring problems, or software bugs that require updates or reprogramming. Sometimes manufacturers issue technical service bulletins (TSBs) or recalls to address known problems. If your vehicle keeps returning to the dealer for the same forward collision issue without a lasting fix, careful documentation of each visit can be crucial under California’s lemon law framework.

How California Lemon Law May Apply to You

California’s Song-Beverly Consumer Warranty Act (the California Lemon Law) generally applies to new—and in many cases used—vehicles sold or leased with a manufacturer’s warranty. If a defect that’s covered by the warranty substantially impairs the vehicle’s use, value, or safety, and the manufacturer or its authorized dealer can’t repair it after a reasonable number of attempts, the law may provide remedies. Safety-related defects in FCW/AEB systems can meet this “substantial impairment” threshold. While there’s a legal “presumption” period (often described as the first 18 months or 18,000 miles), your rights can extend throughout the applicable warranty. Specifics depend on the facts, so a consultation is important.

Practical steps can strengthen your position. Keep copies of all repair orders and note mileage, dates, and descriptions of symptoms (“phantom braking at 45 mph on dry road,” “no warning before impact risk”). Ask the dealer to document any software updates, calibrations, TSBs, or parts replaced. Check for recalls at NHTSA.gov/recalls using your VIN, and follow the owner’s manual for camera/radar care. If the system is repeatedly labeled “operating as designed” but the problem persists, politely escalate with the service manager or manufacturer case line, and continue to document. Avoid modifications that could affect sensors, and let trained technicians handle ADAS calibrations.