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.
Software now controls everything from your car’s engine timing to its backup camera and lane-keeping systems. When that software ships from the factory with bugs, glitches, or failed updates, the problems can be just as disruptive—and sometimes as dangerous—as traditional mechanical defects. If you’re in California and dealing with recurring software issues, understanding how the state’s Lemon Law can apply may help you decide what to do next.
Do Factory Software Defects Qualify Under CA Lemon Law?
California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) covers new and certain used vehicles that have defects the manufacturer can’t fix within a reasonable number of attempts during the warranty period. “Defects” aren’t limited to hardware—software that came with the vehicle from the factory, or manufacturer-issued updates that cause persistent problems, may qualify when they substantially impair the car’s use, value, or safety. That can include issues like an engine control module bug that triggers limp mode, an infotainment crash that kills the backup camera, phantom braking tied to driver-assistance software, or an over-the-air (OTA) update that repeatedly bricks the screen or disables features.
The law doesn’t require the defect to happen every single drive. Intermittent software faults—freezing displays, random warning lights, false sensor alerts, or battery-drain from background processes—can still count if they recur and the dealer can’t resolve them after reasonable repair attempts. California’s “presumption” rules can help in the first 18 months or 18,000 miles: generally, two or more attempts for a serious safety defect, four or more for a non-safety defect, or 30+ total days out of service may trigger a presumption that the manufacturer had a reasonable chance to fix the issue. Even if you’re outside that presumption window, you may still have rights under the warranty.
It also matters who does the work. To preserve Lemon Law rights, repairs typically need to be done by the manufacturer or its authorized dealers while the vehicle is under the manufacturer’s warranty. This is especially important with software because dealers can install specific patches, calibrations, and firmware versions, and they can document version numbers and diagnostic codes. While potential outcomes can include repurchase, replacement, or a cash settlement, the right next step depends on the facts—what the defect is, how many times repairs were attempted, and how the problem affects your use, value, or safety.
Steps to Document and Report Factory Software Defects
Start by capturing the symptoms. Note the date, time, mileage, weather, and what you were doing when the glitch appeared—starting the car, using cruise control, backing up, or after an OTA update. Video or photos of frozen screens, error messages, or sudden system restarts can be extremely helpful, especially for intermittent issues. If your vehicle or phone app provides logs or update histories, take screenshots showing software version numbers and the dates updates installed or failed.
When you visit the dealer, clearly describe the issue and ask that your complaint be written on the repair order in your own words (“customer states”) and that the dealer notes any confirmed findings (“dealer states”), diagnostic trouble codes, TSBs (Technical Service Bulletins), and software or firmware versions before and after repair. Request copies of every repair order and invoice, including zero-dollar warranty invoices. Keep records of all communications with the dealer and manufacturer, any loaner or rental car usage, and the total days your vehicle is out of service—even if the dealer says they are “waiting on a software patch.”
If the problem persists, escalate. Politely ask the dealer to open a case with the manufacturer and provide you with a case number. Consider requesting another authorized dealer to evaluate the vehicle if the first shop says “no problem found.” Avoid modifying the vehicle or installing third-party software while the issue is ongoing. If you receive a recall or TSB related to the software, schedule the update promptly and keep proof. Once there have been multiple repair attempts or significant downtime, you can discuss your situation with a California lemon law attorney to understand your options under the warranty.
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.