California's lemon law is the Song-Beverly Consumer Warranty Act (California Civil Code section 1790 and following), and its core test is unusually specific. Under the law's "presumption" (Civil Code section 1793.22, the Tanner Consumer Protection Act), a new vehicle is presumed to be a lemon if, within 18 months of delivery or 18,000 miles on the odometer (whichever comes first), the manufacturer or its authorized dealer could not repair a warranty defect after a reasonable number of attempts. "Reasonable" is defined by hard numbers: generally four or more repair attempts for the same substantial problem, two or more attempts for a defect likely to cause death or serious bodily injury, or the vehicle being out of service for repairs for a cumulative total of more than 30 days. Meet one of these, and the manufacturer must replace the vehicle or refund your money.
Which vehicles and defects qualify
The Song-Beverly Act covers new and certain used motor vehicles bought or leased in California and sold with a manufacturer's new-car warranty, when used primarily for personal, family, or household purposes. It also extends to vehicles used for business if the business has five or fewer registered vehicles and the vehicle's gross weight is under 10,000 pounds. The protection reaches the chassis, chassis cab, and drivetrain of a motor home, dealer-owned cars, and "demonstrator" vehicles, and it applies to leased vehicles as well as purchased ones.
Not every flaw counts. The defect must be covered by the warranty and must substantially impair the use, value, or safety of the vehicle to you, the buyer. Cosmetic blemishes, problems caused by your own abuse or unauthorized modifications, and ordinary wear typically do not qualify. The defect generally must first appear while the express warranty is still in effect, though you can pursue a claim after the warranty expires if the qualifying repair attempts happened during the warranty period.
How the repair-attempt count works
The 18-month/18,000-mile window creates a legal presumption in your favor, meaning that if you hit those thresholds the law assumes the vehicle is a lemon and shifts the burden to the manufacturer. Importantly, this is a presumption, not a hard cutoff: you can still win a lemon-law claim outside 18 months or 18,000 miles, but you lose the automatic presumption and must prove that the number of repair attempts was unreasonable under the circumstances.
A few details matter. The repair attempts must be for the same underlying defect (or, for the out-of-service count, any combination of warranty repairs adding up to more than 30 days). If the manufacturer's warranty or owner materials direct you to send written notice directly to the manufacturer before claiming a refund or replacement, you generally must do so and give it one more chance to fix the problem. Keep every repair order, even for visits where the dealer says it could not duplicate the problem, because those still count as attempts.
Refund or replacement: your choice
When a vehicle qualifies, the buyer, not the manufacturer, chooses between a replacement and a refund. A refund (called restitution) must return the full purchase price you paid, including taxes, license and registration fees, and other official charges, plus incidental costs such as towing and rental cars. From that, the manufacturer may subtract a mileage offset for your use of the vehicle before the first repair attempt for the defect, calculated under a statutory formula based on the miles driven before that first repair divided by 120,000. If you financed the car, the refund also covers the amount you still owe on the loan or lease.
If you instead choose a replacement, the manufacturer must provide a substantially identical new vehicle and cover the related fees. When a manufacturer's failure to comply is found to be willful, the law allows a civil penalty of up to two times the actual damages, on top of the refund, which is a powerful incentive for manufacturers to settle valid claims. Prevailing consumers can also recover their attorney's fees and costs, which is why many lemon-law attorneys take cases with no upfront charge.
How California compares to federal law
The federal baseline is the Magnuson-Moss Warranty Act, which lets consumers nationwide sue over breached written warranties and recover attorney's fees. California's Song-Beverly Act is significantly stronger: it sets concrete repair-attempt thresholds, mandates the refund-or-replacement remedy, and adds the double-damages civil penalty that federal law does not. Many California lemon-law lawsuits assert claims under both statutes at once.
How to enforce your rights
Start by documenting everything: keep a file of repair orders, dates, mileage, and written communications. Report the defect to an authorized dealer while the warranty is active and let it complete its repair attempts. If the problem persists, send the manufacturer written notice (certified mail is wise) describing the defect and requesting a refund or replacement.
Many manufacturers participate in a state-certified arbitration program (such as BBB Auto Line) that can order a refund or replacement at no cost to you, and California's arbitration programs are overseen by the Department of Consumer Affairs' Arbitration Certification Program. You are generally not required to arbitrate before suing unless the warranty includes a qualifying program, but a favorable arbitration decision binds the manufacturer while leaving you free to go to court if you lose. If arbitration is unavailable or unsuccessful, you can file a lawsuit, typically with a lemon-law attorney given the fee-shifting provisions.
Be aware that California's lemon-law procedures were modified by recent legislation (Assembly Bill 1755), which adjusted pre-lawsuit notice steps and the filing timeline for certain claims. Because these procedural rules and effective dates can affect your deadlines, confirm the current requirements before acting.
Where to verify
For authoritative, current guidance, consult the California Attorney General's Office (California Department of Justice), which runs the state's consumer-protection program, and the California Department of Consumer Affairs, which certifies the arbitration programs and publishes lemon-law information. These official sources confirm the statutory thresholds, the arbitration options, and any recent changes to filing procedures. Because lemon-law claims involve strict documentation and timing, and because the dollar amounts at stake are high, consider a free consultation with a California lemon-law attorney before you accept any manufacturer offer.
Official California Sources
This page is based on California law. Limits and deadlines change — verify the current details directly with the official California sources below. This is general legal information, not legal advice.
Federal law also applies. Federal laws like the Fair Debt Collection Practices Act and Fair Credit Reporting Act protect you nationwide, on top of California’s own rules.
Frequently asked questions
How many repair attempts make a car a lemon in California?
Under the Song-Beverly Act's presumption, generally four or more repair attempts for the same substantial defect, two or more attempts for a defect likely to cause death or serious injury, or more than 30 cumulative days out of service, all within 18 months of delivery or 18,000 miles, whichever comes first.
Can I get a full refund or do I have to take a replacement?
In California the buyer chooses. A refund (restitution) returns the purchase price including taxes and fees plus incidental costs, minus a mileage offset for use before the first repair attempt. You may instead demand a substantially identical replacement vehicle.
Does the California lemon law cover used or leased vehicles?
Yes. The Song-Beverly Act covers leased vehicles and certain used vehicles still under a manufacturer's new-car warranty, including dealer-owned and demonstrator cars. It can also cover business vehicles if the business has five or fewer registered vehicles under 10,000 pounds.
What is the mileage offset and how does it reduce my refund?
The manufacturer can deduct an amount for your use of the vehicle before the first repair attempt for the defect, calculated by the miles driven before that first repair divided by 120,000, multiplied by the purchase price. Miles driven after the first repair attempt are not deducted.
Do I have to go to arbitration before suing in California?
Usually only if the manufacturer offers a state-certified arbitration program that meets statutory requirements. A favorable arbitration decision binds the manufacturer, but if you lose you can still file a lawsuit. Confirm current procedural steps, which were affected by recent legislation.
This article is general legal information, not legal advice, and may not reflect the most current law or the law in your jurisdiction. Laws vary by state and change over time. For advice about your specific situation, consult a licensed attorney.
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