Advanced driver-assistance systems (ADAS) are designed to make driving safer and easier, but when the same safety feature keeps failing—like phantom braking, lane-keeping drift, or cameras that constantly go “offline”—it quickly becomes more than a nuisance. If your vehicle’s ADAS problem reappears after multiple service visits, California’s lemon law may be relevant. This article explains how recurring ADAS defects are treated under California law and what practical steps you can take to protect your rights.
ZapLemon: California Lemon Law for Reappearing ADAS Defects
Modern cars rely on sensors, cameras, radar, and software to power features like lane-keeping assist, adaptive cruise control, blind spot monitoring, and automatic emergency braking. When these systems glitch, you might see warnings such as “Front Camera Unavailable,” experience unexpected disengagements, or encounter sudden braking with no obstacle in sight. Because ADAS issues can be intermittent and environment-dependent, many drivers get “no problem found” notes from the dealer—even though the defect returns days later.
California’s lemon law, the Song-Beverly Consumer Warranty Act, generally covers new and certain used vehicles sold or leased in the state with a manufacturer warranty. In plain terms, if a covered defect substantially impairs the vehicle’s use, value, or safety, and the manufacturer (through its dealers) has had a reasonable number of chances to fix it, you may be entitled to remedies such as repurchase or replacement. What counts as a “reasonable number” depends on the facts, and safety-related defects can sometimes require fewer repair attempts. Time out of service (for example, 30 or more cumulative days) can also matter, and visits that end with “could not duplicate” may still be relevant if they’re documented.
At ZapLemon, we focus on the recurring, hard-to-catch problems that often plague ADAS-equipped vehicles—whether the root cause is a faulty sensor, wiring issue, calibration error, or buggy software update. Our team reviews warranty terms, repair records, and communications with the dealer or manufacturer to understand the pattern. While we can’t promise results and this information isn’t legal advice, we can help you assess whether your situation may fit California’s lemon law framework and discuss next steps in a consultation.
What to Document When the Same ADAS Issue Returns
Start a simple driving log the moment the issue reappears. Note the date, time, mileage, speed, and road conditions when the problem occurs—rain, glare, faded lane lines, construction zones, or heavy traffic can all be relevant for ADAS. Capture dashboard messages, chimes, and warning icons. If safe, use your phone to record short videos that show the alert or behavior (for example, sudden braking with no obstacle, lane-keep ping-ponging, or cameras dropping out).
Each time you visit the dealer, ask for the complete, itemized repair order (not just a payment receipt). Make sure your complaint is written in your own words and is specific (e.g., “phantom braking at freeway speeds, multiple times daily”), and that the dealer records diagnostic codes, calibrations performed, software versions installed, and any technical service bulletins (TSBs) or recalls applied. Keep track of loaner or rental days and the total time your car is out of service. Save text messages, emails, and call logs with the dealer or manufacturer, as well as any OTA update notices or release notes.
Organize everything in a single folder—logs, videos, repair orders, warranties, and correspondence—and keep a running timeline. Avoid clearing fault codes or resetting systems before service, and try not to modify sensors, cameras, or the windshield (which can affect calibrations) without confirming manufacturer guidance. Review your warranty booklet to understand coverage windows and exclusions, and remember that deadlines may apply under California law. If patterns persist despite multiple attempts, consider contacting ZapLemon to discuss your situation and whether your documentation aligns with California lemon law requirements.
This article is for general informational purposes only, is not legal advice, and does not create an attorney-client relationship. Past results do not guarantee similar outcomes, and any legal analysis depends on the specific facts of your case. This content may be considered attorney advertising. If you believe your vehicle may qualify as a lemon due to a reappearing ADAS defect, contact ZapLemon for a consultation at (310) 489-3017 or visit https://zaplemon.com. We can review your repair history, warranty, and documentation and help you understand your options under California law.