Lemon Law Attorneys: Understanding Burden of Proof in Claims

When a car keeps breaking down, it’s natural to wonder whether California’s lemon law can help. One of the first concepts to understand is the “burden of proof”: who has to show what, and with what kind of evidence. In this article, ZapLemon explains how the burden of proof works in California lemon cases and the types of records and paperwork that can make or break a claim—so you can take your next step with confidence.

What Burden of Proof Means in California Lemon Cases

In California lemon law cases, the consumer carries the burden of proof. That means you must show it’s more likely than not that your vehicle meets the legal standards for a “lemon.” Lawyers call this the “preponderance of the evidence” standard—think of it as tipping the scale just past 50%. You don’t have to prove your case beyond a reasonable doubt like in a criminal trial, but you do need organized, credible evidence that supports your claim.

Under California’s Song-Beverly Consumer Warranty Act (the state’s lemon law), the basics you typically need to show include: the vehicle was covered by the manufacturer’s express warranty; a defect arose during the warranty period; you gave the manufacturer or its authorized dealer a reasonable number of chances to fix it; and the defect substantially impairs the vehicle’s use, value, or safety. The issue can be anything from transmission shuddering and hard shifts to recurring electrical shutdowns, braking problems, or infotainment failures that knock out backup cameras or Bluetooth. It also matters that you presented the car for repair to an authorized dealership and that the problem wasn’t caused by misuse or an unauthorized modification.

California also has a “lemon law presumption” that can make things easier if your repair history falls within certain early ownership milestones (for example, within 18 months or 18,000 miles) and meets specific repair-attempt or days-out-of-service thresholds. This presumption is helpful but not required—you can still win outside those windows with solid documentation. Manufacturers may argue that the condition is “normal,” that they couldn’t verify the complaint, or that the issue is fixed. That’s why detailed records and a clear timeline often carry the day.

Evidence You’ll Need: Repairs, Records, and Warranty

Repair documentation is the backbone of most lemon law claims. Each time you visit the dealer, insist on a written repair order that captures the date and mileage, your exact complaint in your own words, the technician’s findings, and what was done (including any parts replaced). If the vehicle stays at the shop, those days count—keep track. Repeated repair orders showing you reported the same symptoms multiple times (for example, “vehicle stalls when turning left,” “check engine light returns after reset,” “transmission bangs into second gear”) are powerful evidence.

Keep your warranty booklet and purchase or lease paperwork handy. These materials help establish that your vehicle was covered by the manufacturer’s express warranty when the problem surfaced. If you bought the car used, coverage may still apply if the factory warranty was active or if it’s a certified pre-owned vehicle with a manufacturer-backed limited warranty. Other helpful items include recall notices, service campaigns, proof of scheduled maintenance, and any extended service contracts—these all help map out what was promised and when.

Round out your file with supporting proof. Save emails and texts with the dealer or manufacturer, take photos or videos capturing warning lights or the defect in action, and keep towing and rental-car receipts. Create a simple timeline listing each repair visit, what you reported, and how long the vehicle was out of service. If you’ve misplaced records, you can request a “service history printout” from the dealer. Try not to diagnose the problem yourself—just describe what you experience (“vehicle hesitates on acceleration,” “burning smell after freeway driving”) so the paperwork reflects your real-world symptoms.