Lemon Law Attorneys: How to Identify a Repeat Defect

If you keep taking your car back to the dealer for the same problem and it just won’t stick, you may be dealing with a “repeat defect.” Under the California Lemon Law, repeat defects can trigger powerful consumer protections—especially when they affect the vehicle’s use, value, or safety and persist despite multiple repair attempts. Below, ZapLemon explains what counts as a repeat defect and how to document recurring issues so you can make informed decisions about your next steps.

What Counts as a Repeat Defect Under CA Lemon Law

In California, a repeat defect generally means the same problem—or a closely related problem—keeps coming back while the vehicle is under the manufacturer’s warranty. It must be a substantial issue that affects how you use the car, how much it’s worth, or how safe it is to drive. This applies to many new vehicles and, in many situations, used vehicles that are still covered by the manufacturer’s warranty.

The law uses the idea of a “reasonable number of repair attempts.” California’s Lemon Law Presumption (often called the Tanner presumption) says a vehicle may be presumed a lemon if, within the first 18 months or 18,000 miles, either: the dealer tried to fix the same issue 4 or more times; the dealer tried 2 or more times to fix a problem that could cause death or serious injury; or the vehicle was out of service for repair for 30 or more total days. Even if you’re outside those mile or month markers—or don’t meet those exact numbers—you may still have rights. “Reasonable” can vary based on the defect and circumstances.

A repeat defect doesn’t require the exact same error code every visit. For example, a transmission that shudders and slips, even if the dealer swaps from a software update to a valve body repair, can be viewed as a recurring transmission issue. Likewise, recurring brake pulsation, repeated engine stalling with a check-engine light, a persistent water leak that causes mold, or ongoing electrical failures like random shutdowns or dead batteries can all be “substantially similar” problems. On the other hand, normal wear, damage from accidents, or issues caused by aftermarket modifications typically won’t qualify.

Steps to Document Recurring Issues and Repairs

Strong documentation is the backbone of any repeat-defect claim. Each time you visit the dealer, ask for a repair order and a final invoice. Check that your complaint is written in plain language that matches your experience, including dates, mileage, and symptoms. If the dealer “cannot verify” or “could not duplicate” the problem, you still want that noted—it shows you sought warranty service.

Keep a simple defect diary. Note the date, mileage, weather/temperature, driving conditions, warning lights, and exactly what happened. Add photos or videos when safe to do so—brief clips of the infotainment rebooting, the dashboard lighting up, or the vehicle failing to shift can be persuasive. Track tow receipts, rental or loaner car paperwork, and the days your vehicle sits at the dealership. Save recall notices, technical service bulletins (TSBs) you receive, and any emails or texts with the dealer or manufacturer.

A few practical tips: schedule repairs with an authorized dealer so attempts count under the manufacturer’s warranty. Avoid clearing codes or disconnecting the battery before service, since that can wipe valuable data. Don’t install aftermarket parts that could muddy the cause of the problem. Check your warranty booklet, and if the issue raises a safety concern (like brake or steering problems), tell the service advisor and make sure that’s reflected on the repair order. If the problem keeps returning, consider contacting a California lemon law attorney to discuss your situation—an initial consultation can help you understand your options.