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.
Lane Keep Assist is supposed to gently keep your vehicle centered in its lane, reducing fatigue and adding a layer of safety on highways. When it drifts, jerks, shuts off without warning, or constantly throws alerts, it can feel anything but safe. If you’ve returned to the dealership multiple times for these problems, you may be wondering how California’s Lemon Law applies. ZapLemon created this guide to help you understand the basics, in plain English.
California Lemon Law and Lane Keep Assist Failures
California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) requires manufacturers to repair warranty-covered defects within a reasonable number of attempts. It applies to many new vehicles and certain used vehicles sold with a manufacturer’s warranty. Advanced driver-assistance features—like Lane Keep Assist (LKA), lane centering, or lane departure prevention—are components of the vehicle that can fall under warranty when they malfunction.
A lane-keeping defect may qualify as a “substantial impairment” if it affects the vehicle’s use, value, or safety. Examples include steering corrections that are too aggressive, repeated disengagements, false lane-drift warnings, or the system failing to intervene when it should. Because these features relate to steering and roadway positioning, many drivers experience them as safety issues, especially at highway speeds or in traffic.
The law gives the manufacturer a fair chance to fix the defect. If repairs aren’t successful after a reasonable number of attempts—or the vehicle is out of service too long—the consumer may be entitled to remedies such as a buyback, replacement, or a negotiated cash-and-keep outcome. California also has a legal “presumption” that can support a lemon claim if certain repair-visit counts or days-out-of-service occur within the first 18 months or 18,000 miles, but that presumption is not required to win and every case is fact-specific. Outcomes vary based on evidence, timing, and warranty status.
Signs, repair attempts, and steps to protect rights
Common signs of Lane Keep Assist trouble include the vehicle ping-ponging between lane markings, the wheel tugging unexpectedly, frequent “temporarily unavailable” messages, or warning chimes without clear conditions. Some drivers notice the system won’t activate on straight, well-marked roads, or it swings wide on curves. Others see repeated camera/ radar calibration notices, steering-assist faults, or errors after windscreen replacements or bumper repairs that involve sensors.
Documenting repair attempts is crucial. Each time you visit a dealer, describe the symptoms exactly as you experience them—speed, road type, weather, how often it happens—and ask that your words appear on the repair order. Keep copies of all work orders, invoices, and warranty printouts. If safe to do so, note dates, mileage, and take short videos of the behavior. Ask the service advisor whether software updates, technical service bulletins (TSBs), camera/radar calibrations, or wiring inspections were performed, and make sure those steps are listed in writing.
To protect your rights: schedule repairs promptly, confirm your warranty is active, and avoid clearing fault codes or altering the vehicle in ways that could complicate diagnostics. If the issue persists, consider elevating the concern to the manufacturer’s customer-care line and obtain a case number. Be mindful of timelines—California generally has deadlines for bringing claims, and evidence tends to be stronger closer to the repair attempts. When you’re ready to explore options, a consultation can help you understand whether your facts fit California’s Lemon Law framework.
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.