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.
Advanced driver assistance systems (ADAS) like adaptive cruise control, lane-keeping assistance, automatic emergency braking, and parking assist are now standard on many new cars. When they work, they can make driving easier and safer. But when these features behave unpredictably—think phantom braking on the freeway, steering that “ping-pongs” between lane lines, or cameras that go dark in the rain—they can create stress, safety concerns, and frustration at the dealership. This article explains, in plain language, how California’s Lemon Law may apply to unreliable driver assistance features and what steps you can take if you’re dealing with repeat ADAS problems.
California Lemon Law for Unreliable Driver Assist
California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) protects consumers when a vehicle has defects covered by warranty that substantially impair the car’s use, value, or safety and the manufacturer can’t fix them after a reasonable number of attempts. That protection isn’t limited to engines and transmissions. In today’s vehicles, software-driven systems—radar sensors, cameras, driver monitoring, and the control modules that run them—are integral to safe operation. If those systems malfunction repeatedly under normal use, they may be treated like any other warrantied nonconformity.
Unreliable ADAS may show up as intermittent faults: sudden braking with no obstacle, frequent lane-keep disengagement, false forward collision warnings, blind-spot indicators that drop out, or parking sensors that fail after rain. These issues are often tied to software bugs, calibration problems, sensor misalignment, or wiring and module failures. Whether your vehicle is new or used, if it’s still under the manufacturer’s warranty (including certified pre-owned coverage), repeated ADAS failures and unsuccessful repairs can qualify for Lemon Law remedies, depending on the facts.
What counts as a “reasonable number” of repair attempts depends on the circumstances. California’s Lemon Law presumption provides general guideposts during the first 18 months or 18,000 miles, such as multiple repair attempts for the same problem or the vehicle being out of service for an extended period; fewer attempts may be expected for safety-related defects. You don’t have to meet the presumption to pursue a claim—it’s just one tool. Potential remedies can include a replacement or repurchase (with a mileage-based usage offset), plus reimbursement of certain incidental costs. Every case is fact-specific, and the law is nuanced, especially for software-related defects, so getting a case-specific consultation can be helpful.
Steps to Take When Driver Assistance Features Fail
Prioritize safety first. If a driver assistance feature behaves unpredictably, use your judgment to disengage it and drive manually if needed. Make detailed notes right away: date, time, speed, weather, road type, traffic conditions, and what exactly happened on the dashboard (warnings, chimes, icons). If it’s safe, short videos or photos of alerts and error messages can be valuable. Avoid modifying or “tinkering” with sensors or cameras yourself, as that can complicate diagnosis and warranty coverage.
Schedule a warranty appointment promptly and describe the symptoms clearly. Ask the dealership to document the concern in your own words on the repair order—specific phrases like “phantom braking,” “lane-keep disengages without warning,” or “camera feed intermittently unavailable” can help the technician and create a clear paper trail. Request copies of all repair orders and invoices, including notes on software versions before and after updates, calibrations performed (camera/radar), and any parts replaced. Keep a simple file with dates in service, mileage in and out, and days the vehicle was unavailable. Save related receipts (towing, rental, rideshare) in case reimbursement becomes an issue.
If the problem continues after multiple visits, escalate. Contact the manufacturer’s customer care to open a case number and provide your documentation. Ask the dealer to check for technical service bulletins (TSBs) and recalls applicable to your VIN. Some manufacturers offer dispute resolution or arbitration programs you can consider. Because timelines and requirements under California law can be technical, many consumers find it useful to consult a Lemon Law attorney to evaluate options based on their records. If you’re in California and dealing with recurring ADAS failures, ZapLemon can review your situation and explain next steps in a straightforward way.
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.