Modern cars run on millions of lines of code, so a software glitch can affect everything from your touchscreen to your transmission. If your vehicle repeatedly malfunctions because of software or firmware issues, you may wonder whether California’s lemon law applies. Below, ZapLemon explains how California’s consumer warranty laws treat software-glitched cars and what you can do to document problems for a potential claim. This article is for general information only and isn’t legal advice.
California Lemon Law for Software-Glitched Cars
California’s Song-Beverly Consumer Warranty Act (often called the California Lemon Law) can apply to vehicles with persistent software or firmware defects, not just mechanical problems. The key idea is “nonconformity”: a defect covered by the manufacturer’s warranty that substantially impairs the car’s use, value, or safety. That can include issues like infotainment screens that freeze or reboot while driving, advanced driver assistance systems (ADAS) that misbehave, phantom warning lights tied to firmware faults, battery management software on EVs that limits range, or over-the-air (OTA) updates that disable features.
To qualify under the law, the manufacturer or its authorized dealer must generally be given a reasonable number of opportunities to repair the defect. California has a “presumption” that can apply within the first 18 months or 18,000 miles: for example, multiple repair attempts for the same issue, or the car being out of service for a total of 30 days, may indicate the problem wasn’t fixed. Safety-related defects (like camera or sensor failures causing sudden braking or loss of power due to software) can require fewer attempts. These are guidelines, not guarantees—facts matter, and every situation is unique.
If the defect meets the legal standards and isn’t fixed after reasonable attempts, potential remedies can include a repurchase (buyback), replacement, or sometimes a negotiated cash settlement to keep the vehicle. There are mileage and other offsets that may apply, and federal warranty law (the Magnuson-Moss Warranty Act) can also come into play. Because software problems can be intermittent and complex, how you present and document them matters. A consultation with a lemon law attorney can help you understand how the rules may apply to your specific facts.
How to Document Bugs, Repairs, and Warranty Claims
Start a simple log the day the problem first appears. Note the date, mileage, weather, apps or features in use, and what you were doing when the glitch occurred. Capture photos or videos of error messages, frozen screens, lane-keep or adaptive cruise control misbehavior, or sudden power-loss events. When possible, record software version numbers before and after OTA updates and save any pop-up release notes—those details can help show the issue persisted through updates.
At every service visit, make sure your concern is written on the repair order in your own words (for example, “infotainment reboots daily; ADAS disengages unexpectedly; power reduced after OTA update”). Ask for copies of all paperwork, including diagnostic codes, TSB (Technical Service Bulletin) numbers, parts replaced, and the software/firmware versions installed. Track how long the car is at the dealership and keep proof of any towing, loaners, or rental cars. Avoid factory-resetting the system before your appointment, and ask the service advisor not to clear event logs until diagnostics are complete.
If the problem continues, open a case with the vehicle manufacturer and write down the case number. Follow up by email so you have a written trail, and save all texts and voicemails. Check for recalls and TSBs on the NHTSA website and the manufacturer’s owner portal. Avoid aftermarket modifications that could complicate warranty coverage. Finally, review your warranty booklet to understand coverage and limits, and consider speaking with a lemon law attorney about timelines and options. A brief consultation can clarify next steps without committing you to any particular path.
This article is for informational purposes only, is not legal advice, and does not create an attorney–client relationship. Attorney advertising. Results depend on your specific facts and cannot be guaranteed. If you believe your vehicle may qualify as a lemon due to software or firmware issues, contact ZapLemon for a consultation at (310) 489-3017 or visit https://zaplemon.com. We’re here to review your situation and explain your options.