Blind Spot Monitoring (BSM) is supposed to make lane changes safer, not more stressful. When the sensors misread traffic, fail to alert, or constantly flash warnings, it can feel like you’re driving with a false sense of security. If your vehicle’s BSM has been in the shop multiple times and the problem keeps coming back, you might be wondering whether California’s Lemon Law can help. Below, ZapLemon explains how the law can apply to BSM failures and what records to keep to protect your rights—without legal jargon or unrealistic promises.
How California Lemon Law Applies to BSM Failures
California’s Lemon Law (the Song-Beverly Consumer Warranty Act) generally covers new and, in many cases, used vehicles that are still under the manufacturer’s warranty. If a manufacturer or its authorized dealer cannot repair a defect that substantially impairs the vehicle’s use, value, or safety after a reasonable number of attempts, you may be entitled to remedies such as a repurchase or replacement. Safety systems like BSM are often central to this analysis because they directly affect safe lane changes and collision avoidance.
Repeated BSM issues can take different forms: the system fails to detect a vehicle in the blind spot, triggers false alerts, disables itself with a warning light, or works only intermittently. These problems may stem from faulty radar modules, misaligned sensors after a minor bump, wiring faults, software bugs, or camera calibration issues. Even if the car drives, a malfunctioning BSM can still be considered a serious safety-related defect when it undermines confidence in daily driving.
California also has a “lemon law presumption” that can apply within the first 18 months or 18,000 miles (whichever comes first) if certain conditions are met, such as multiple repair attempts for the same issue or extended time out of service. That presumption doesn’t decide every case, but it can shift the discussion in the consumer’s favor. Timelines and qualifications can be nuanced, and other deadlines may apply, so it’s smart to speak with a consumer attorney. ZapLemon can evaluate whether your BSM situation might fit within California’s lemon law framework.
Records to Keep for Blind Spot Monitoring Claims
Good documentation is often the difference between frustration and progress. Start by saving every repair order and invoice from the dealership—even if it says “no problem found.” Ask the service advisor to list your exact complaint in your own words (for example, “BSM failed to alert, near-miss on freeway, occurred at 65 mph in light rain”) and to note any diagnostic trouble codes, test drives, calibrations, software updates, and parts replaced. Confirm the dates, mileage, and number of days your vehicle was out of service.
Create a simple incident log on your phone or in a notebook. For each BSM event, note the date, mileage, speed, road and weather conditions, whether there was traffic in the blind spot, and what the system displayed or didn’t display. When safe, take photos or short videos of warning messages or icons on the dash. If your vehicle has received over-the-air updates or dealer-installed software, record the version numbers—software history can matter in ADAS cases.
Keep related paperwork in one place: your purchase or lease agreement, warranty booklet, any recall or technical service bulletin (TSB) notices, and correspondence with the dealer or manufacturer (emails, texts, case numbers). Save receipts for towing, rental cars, rideshares, or other out-of-pocket costs tied to BSM repairs. These records help show the pattern of the defect and the efforts to fix it, both of which are important for warranty claims and lemon law evaluations.
This article is for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship, and results cannot be guaranteed. If you believe your vehicle’s Blind Spot Monitoring issues are ongoing despite warranty repairs, the next step is a consultation. Contact ZapLemon at ZapLemon.com to discuss your situation and learn about your options under California law.