Lane Departure Warning is supposed to keep you safer, not startle you the moment you drive off the lot. If your new or newly purchased vehicle fires off false lane-departure alerts at delivery, you’re not alone—and you may be dealing with a defect covered by California’s Lemon Law. Below, ZapLemon explains how the law treats advanced driver-assistance issues like Lane Departure Warning and what practical steps you can take right away. This article is for general information only; for legal advice tailored to your situation, please contact us for a consultation.
California Lemon Law: Lane Departure Warning False Alerts
California’s Lemon Law—part of the Song-Beverly Consumer Warranty Act—applies to new and used vehicles sold or leased in California with a manufacturer warranty. It covers “nonconformities,” which are defects that substantially impair the vehicle’s use, value, or safety and that the manufacturer or its authorized dealer can’t fix after a reasonable number of repair attempts. Modern advanced driver-assistance systems (ADAS), including Lane Departure Warning and Lane Keeping Assist, are part of the vehicle’s safety equipment. When these features trigger false alerts, chimes, or steering nudges, particularly from day one, they can interfere with safe driving and may rise to the level of a covered nonconformity.
California also has what’s commonly called the “Tanner presumption.” If, within the first 18 months or 18,000 miles, the vehicle has two or more repair attempts for a defect that could cause death or serious injury, four or more attempts for the same non-safety defect, or more than 30 cumulative days out of service for warranty repairs, the law presumes the manufacturer had a reasonable opportunity to fix the issue. This presumption makes a claim easier to prove, but it’s not the only way to qualify—vehicles can still be lemons without meeting the presumption if the facts show the defect substantially impairs use, value, or safety and isn’t repaired after a reasonable number of tries.
False Lane Departure Warning alerts can stem from software glitches, camera misalignment, windshield replacement or improper calibration, sensor obstructions, or wiring faults. When those problems persist despite dealership updates or recalibrations, the issue can affect daily driving, resale value, and confidence in the car’s safety systems. If the defect exists at delivery or appears immediately afterward, it may indicate a pre-existing condition. Under the Lemon Law, the manufacturer must be given a reasonable opportunity to repair under warranty; if it can’t, you may be entitled to remedies such as a repurchase or replacement, as well as incidental damages. Every case turns on its facts, so speaking with a professional is the best way to assess your options.
What to Do When False Alerts Start at Delivery
If false lane-departure alerts begin as you take delivery or on the first drive home, document everything. Note the date, mileage, weather, road conditions, dash messages, and any warning lights. Record short videos of the alerts and, if it’s safe, how the vehicle behaves. Ask the dealer to open a repair order right away, even if they say “it’s normal” or “we’ll update it later.” A repair order—showing your complaint in your own words—is the backbone of a Lemon Law record and matters far more than a verbal assurance.
At the first service visit, request a copy of the repair order and final invoice that lists all diagnostics, software versions, calibrations, and parts replaced. Ask the dealer to document any camera or radar calibrations, windshield work, or TSB (Technical Service Bulletin) updates performed. If the dealer needs more time and keeps the car, confirm the dates out of service and whether a loaner or rental is provided. Keep every document, text, and email related to the problem. Avoid clearing fault codes, disconnecting the battery, or modifying the windshield, cameras, or alignment outside the dealer, as this can complicate diagnostics and records.
If the issue returns, bring it back promptly and describe the same concern again so your repair history clearly shows repeated attempts for the same defect. You can ask whether the manufacturer has engineering notes or updated software coming, and whether a field technician review is appropriate. Persistent false alerts can be distracting and potentially unsafe—if the vehicle feels hazardous to operate, consider limiting use until inspected. Throughout the process, remember that general information online isn’t a substitute for advice about your specific facts. A consultation with ZapLemon can help you understand timelines, what counts as a “reasonable number” of attempts, and how to protect your rights while you work through the warranty process.
Attorney Advertising. This article is for informational purposes only and is not legal advice. Reading this page does not create an attorney-client relationship with ZapLemon. Every situation is different, and outcomes depend on specific facts and applicable law. If you believe your vehicle may qualify as a lemon due to Lane Departure Warning false alerts or other defects, contact ZapLemon at [phone number] or visit [website] to request a consultation.