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.
If your car’s driver monitoring system keeps glitching—flashing “Driver Attention Required” when you’re fully alert, shutting itself off, or failing to warn you at all—you’re not alone. As driver monitors become standard in vehicles with advanced driver-assistance features, more California owners are running into recurring issues that dealerships can’t seem to fix. This article explains, in plain language, how the California Lemon Law may apply when a malfunctioning driver monitor impacts the use, value, or safety of your vehicle.
California Lemon Law for Driver Monitor Failures
California’s Lemon Law—part of the Song-Beverly Consumer Warranty Act—generally protects consumers who purchase or lease a new motor vehicle that develops warranty-covered defects the manufacturer can’t repair after a reasonable number of attempts. In many cases, used vehicles still covered by the manufacturer’s original warranty can also be protected. The law is designed to address problems that substantially impair how safe the car is to drive, how well it works for daily use, or what it’s worth on the market.
Driver monitoring systems (sometimes called “DMS,” “driver attention monitors,” or “driver-facing cameras”) are integrated with features like lane centering, adaptive cruise control, and hands-free assist. When these systems malfunction—false drowsiness alerts, “camera blocked” errors even with a clean lens, warnings that never trigger, or features that shut down unpredictably—they can undermine the usefulness of advanced safety tech and, in some cases, create safety concerns. If the issue persists despite warranty repair attempts, it may fall within Lemon Law protections, depending on the facts, warranty coverage, and repair history.
California has a legal presumption that can help consumers in certain situations: within the first 18 months or 18,000 miles, the law presumes the vehicle is a lemon if the manufacturer has had a reasonable number of chances to fix the defect (for example, two or more attempts for a problem likely to cause serious injury or death, four or more attempts for the same non-safety issue, or the car is out of service for repairs for more than 30 total days). Importantly, your rights do not end after that period—claims can still be valid during the life of the express warranty. Because every case is fact-specific, the best next step is to speak with a professional about your repair history and options.
How to Document Malfunctioning Driver Monitors
Good documentation often makes or breaks a Lemon Law claim. Start by saving every repair order, invoice, and warranty record from the dealership. Make sure your service advisor writes your concern in your own words—for example, “Driver monitor issues false distraction alerts at night; system disables hands-free assist,” not just “check ADAS.” Confirm that the repair order includes dates, mileage in/out, and any diagnostic codes or software versions. If the dealer says “no problem found,” ask them to document exactly what they tested and the conditions.
Capture the problem when it happens. Photos or short videos of error messages, chimes, and alert behavior can be very helpful—especially if the defect happens under certain conditions, like nighttime driving, wearing sunglasses, specific lighting, or on bumpy roads. Note the date, time, weather, speed, and any ADAS setting (e.g., adaptive cruise on, hands-free enabled). If the vehicle receives an over-the-air (OTA) update, record the software version and release notes, and keep screenshots if possible.
Track downtime and related expenses. Keep a log of each day your car is at the dealer, plus loaner or rental car records. Save emails and texts with the service department and the manufacturer. Ask the dealer whether there are any technical service bulletins (TSBs) related to the driver monitor or its camera, sensors, or control module, and request that the TSB number be listed on your repair order if applied. Avoid modifying or covering the driver-facing camera and follow the owner’s manual for cleaning and calibration—manufacturers may point to alterations or misuse to deny warranty coverage.
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.