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.
Modern cars run on code as much as they do on fuel. When a dealer or manufacturer pushes a software update that triggers new glitches—like warning lights, stalling, or malfunctioning safety features—it can be confusing to know what rights you have. California’s Lemon Law can apply to software-related defects too, and understanding how it works may help you decide what to do next if updates keep causing problems.
California Lemon Law and Dealer Software Updates
California’s Lemon Law (the Song-Beverly Consumer Warranty Act) protects buyers and lessees of vehicles that have substantial defects covered by the manufacturer’s warranty that the manufacturer or its authorized dealers can’t fix after a reasonable number of repair attempts. “Substantial” generally means the problem impairs the vehicle’s use, value, or safety. Importantly, software is part of the vehicle. If a dealer-installed or over-the-air update introduces or fails to fix a serious issue—such as sudden power loss, ADAS misalignment, or a recurring infotainment crash that disables climate or backup camera functions—those issues may be treated like any other warrantied defect.
Software-related problems often show up after an update or patch, especially in vehicles with advanced driver-assistance systems, digital instrument clusters, or electronically controlled transmissions. Common examples include: check engine lights tied to calibration errors, phantom collision warnings, lane-keep or adaptive cruise that disengages without reason, battery drain after an OTA, or a no-start condition following a failed update. If these problems persist despite dealer attempts to repair or reflash the system, they may count toward the “reasonable number of attempts” analysis under the Lemon Law.
The law doesn’t require a specific number of attempts in every case, but California has a “lemon law presumption” that can apply within the first 18 months or 18,000 miles if certain thresholds are met (for example, multiple repair attempts for the same issue, fewer attempts for serious safety defects, or 30+ total days out of service). Keep in mind, the presumption isn’t the only path; claims can still succeed outside it. Used and certified pre-owned vehicles may qualify if covered by a manufacturer warranty. Whether an update was part of a recall, a Technical Service Bulletin (TSB), or routine service, what matters is that the manufacturer had a fair chance to fix the defect and it remains unresolved.
When Updates Cause Ongoing Issues: Your Next Steps
Start by documenting everything. Each time the issue occurs, note the date, mileage, conditions (speed, weather, features in use), and warning messages. Take photos or short videos if it’s safe to do so. When you visit the dealer, describe the symptoms clearly and request a detailed repair order that lists your complaint, the technician’s findings, software versions installed, and the exact work performed (including reprogramming, module replacements, or “no trouble found” notes). Save every invoice, even for “no charge” warranty work—these records can be crucial in showing repeated attempts.
Give the dealer and manufacturer a fair opportunity to fix the problem. Ask whether there are open recalls, TSBs, or known software patches for your VIN. If the issue persists, request escalation to the manufacturer’s technical line or a field/region specialist, and ask for a case number. If a rollback or different calibration is available, ask the dealer to note in writing why it can or cannot be performed. Avoid DIY coding or aftermarket modifications during warranty diagnosis, as they can complicate both the fix and your warranty coverage.
If you continue to experience the same defect, or if the vehicle is spending significant time in the shop, you may want to speak with a lemon law attorney to understand your options. Potential remedies under California law can include a repurchase, replacement, or a cash-and-keep settlement, depending on the facts and warranty status. Every situation is different, and software issues can be intermittent, so a careful review of your repair history and warranty documents is important before deciding on next steps. ZapLemon can evaluate your circumstances and help you understand the process.
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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.