Driver assistance technology—things like lane keeping, adaptive cruise control, and automatic emergency braking—can make driving easier and safer when it works. But when these systems repeatedly glitch, shut off, or behave unpredictably, they can raise real safety concerns. This post explains, in plain language, how California Lemon Law may apply to recurring driver assistance malfunctions and what steps you can take to protect your rights.
When Driver Assistance Failures Trigger California Lemon Law
California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) generally applies when a defect covered by the manufacturer’s warranty substantially impairs the vehicle’s use, value, or safety and the manufacturer or its authorized dealer has had a reasonable number of opportunities to fix it. Driver assistance or ADAS issues—such as phantom braking, unreliable lane-centering, radar or camera failures, or persistent “system unavailable” messages—often relate directly to safety. If the problem keeps coming back despite repairs, the situation may fit within lemon law protections.
What counts as a “reasonable number” of repair attempts depends on the facts. As a general guide, California’s “lemon law presumption” may apply during the first 18 months or 18,000 miles if the vehicle has been subject to multiple repair attempts for the same issue, has been out of service for an extended number of days, or has a serious safety defect that isn’t fixed promptly. These are broad benchmarks, not hard-and-fast rules, and cases outside that window can still be evaluated. Because ADAS defects can create sudden or unpredictable behavior—like abrupt braking on the highway or drifting out of lane—recurrence matters.
Real-world examples can include: automatic emergency braking triggering without obstacles; adaptive cruise control disengaging randomly; cameras fogging or sensors failing after software updates; steering assist pulling to one side; or the car requiring frequent “calibration” with no lasting fix. Over-the-air (OTA) updates that temporarily improve things but don’t resolve the root problem still count as repair attempts. If your dealer acknowledges the issue but says “it’s normal” or “we’re waiting on a software patch,” that’s worth documenting for any potential lemon law review.
What to Document, Warranty Tips, When to Contact ZapLemon
Good documentation is crucial. Keep copies of every repair order and invoice, even when you are not charged. Make sure each work order accurately lists your complaint (“phantom braking at 65 mph on highway,” “lane keep disengages after 10 minutes,” “front radar fault after rain”), the dealer’s findings, and what was done. Note dates, mileage in and out, and whether the vehicle was kept overnight. Photos or short videos of dashboard warnings, chimes, or erratic behavior—when safe to capture—can help show patterns.
Check your warranty coverage. Most ADAS components and related software are covered under the new vehicle limited warranty, and sometimes under certified pre-owned warranties or emissions/safety recalls. Ask the service advisor to confirm whether each repair is performed under warranty, and request the warranty line item on your paperwork. If you’re told an ADAS issue is “normal,” ask for that assessment in writing and whether a technical service bulletin (TSB) or updated software exists. Keep a simple log that tracks symptoms, dates, weather conditions, and any OTA updates.
Consider reaching out to ZapLemon when you’ve had repeated repair attempts for the same driver assistance malfunction, when the vehicle has been out of service for many days, when the problem raises obvious safety concerns, or when the dealer can’t replicate but you continue to experience issues. A consultation can help you understand how California Lemon Law may apply to your situation and what next steps make sense for you. Every case is different, and talking with a professional is the best way to get guidance tailored to your facts.
Information in this post is for general educational purposes only, is not legal advice, and does not create an attorney-client relationship. Attorney advertising. If you believe your vehicle may qualify as a lemon due to recurring driver assistance malfunctions, contact ZapLemon for a consultation at (844) 927-5366 or visit https://zaplemon.com. We’re here to listen, review your documentation, and help you understand your options.