Lemon Car Law for Faulty Lane Keep Assist

Lane Keep Assist is supposed to gently nudge your vehicle back into its lane, reducing fatigue and helping prevent crashes. When it misreads lane lines, pulls you toward the shoulder, “ping-pongs” between markers, or simply shuts off without warning, that’s more than annoying—it can be unsafe. If your vehicle’s lane keep assist has repeated issues under warranty, California’s Lemon Law may offer remedies. Below, ZapLemon explains the basics and outlines practical steps to document what’s happening, so you can make informed decisions.

California Lemon Law and Faulty Lane Keep Assist

Lane Keep Assist (LKA) is part of advanced driver assistance systems (ADAS). It uses cameras and sensors to detect lane markings and provide steering assistance. Common problems include the car drifting despite visible lane lines, abrupt steering corrections, false warnings, intermittent shutdowns, or an illuminated ADAS/steering warning light. These issues can stem from software bugs, camera misalignment, faulty sensors, wheel alignment problems, or after-collision calibration errors—and they often show up after software updates or windshield replacements that require recalibration.

California’s Lemon Law—part of the Song-Beverly Consumer Warranty Act—generally applies when a new or certified pre-owned vehicle has a warranty-covered defect that the manufacturer or its dealers can’t fix after a reasonable number of attempts, and the defect substantially impairs use, value, or safety. For many drivers, a faulty LKA affects all three. The law includes a “presumption” period (typically within the first 18 months or 18,000 miles) where certain benchmarks can help show a lemon: multiple repair attempts for the same issue, two or more attempts for a defect likely to cause death or serious bodily injury, or 30+ days out of service. Even if you are outside that window, you may still have rights—the presumption just makes proof easier.

If your vehicle qualifies, potential remedies under the statute can include a repurchase, a replacement, or sometimes a negotiated “cash-and-keep” resolution, depending on the facts and the warranty. Outcomes vary and depend on the specific history of your car, the records you’ve kept, and the manufacturer’s responses. ZapLemon can evaluate your situation and help you understand the options, but a consultation is necessary for legal advice about your particular case.

Steps to Document Lane Keep Assist Defects

Start by keeping a simple log. Note the date, time, speed, weather, road type (city street, highway, curved road), and what the LKA did (e.g., “steered right toward the fog line,” “displayed ‘feature unavailable,’” “deactivated on straight highway”). If safe, capture short videos showing the issue, warning lights, or messages on the instrument cluster. Never try to recreate unsafe situations—only document what occurs naturally and prioritize safety at all times.

Schedule service with an authorized dealer and clearly describe the symptoms. Ask that your exact complaint appears on the repair order (for example: “customer states lane keep assist pulls vehicle right at highway speeds; intermittent LKA unavailable message; occurs 3–4 times per week”). Request copies of every repair order and final invoice. When possible, ask the dealer to note any software updates, ADAS recalibration results, wheel alignment specs, diagnostic trouble codes, and whether they found relevant Technical Service Bulletins (TSBs) or known issues for your VIN.

Build a complete file. Save your warranty booklet, purchase/lease contract, all repair records, and your log. Use the NHTSA website to check for recalls and TSBs, and keep any communications with the manufacturer or dealer, including emails and texts. Track total days your vehicle is out of service. If the problem persists after multiple repair attempts, consider consulting ZapLemon to review your documentation and discuss next steps. A well-organized paper trail can make it easier to understand your rights under California law.