The California lemon law gives you the right to a refund or a replacement vehicle when the manufacturer cannot fix a significant warranty defect after a reasonable number of tries. The core rule, set by the Song-Beverly Consumer Warranty Act and the Tanner Consumer Protection Act, uses three thresholds: four failed repair attempts for the same problem, two attempts for a defect that could cause death or serious injury, or more than 30 days out of service for warranty repairs. If you cross one of those lines while the warranty is in force, the law shifts the burden to the manufacturer.
When Your Vehicle Qualifies as a Lemon
The Tanner Act creates a legal presumption that your car is a lemon if any of the following happens within 18 months of delivery or before 18,000 miles, whichever comes first:1California Legislative Information. California Code CIV 1793.22
- The manufacturer or its authorized dealer has tried to fix the same defect four or more times.
- A defect likely to cause death or serious bodily injury has been repaired twice and still persists.
- The vehicle has been in the shop for warranty repairs for a combined total of more than 30 calendar days. The days do not need to be consecutive.
Once the presumption applies, the manufacturer has to prove the vehicle is not defective, rather than you having to prove it is. You can still bring a claim outside the 18-month, 18,000-mile window; the presumption just makes the case easier. Without it, you carry the full burden of showing the manufacturer had a reasonable chance to fix the problem and failed.
The Direct-Notice Trap
For the four-repair and two-repair presumptions, you must have directly notified the manufacturer about the defect at least once, separate from bringing the car to a dealer. That requirement only applies if the manufacturer clearly disclosed it in the warranty booklet or owner’s manual. If no disclosure, no notification is required.1California Legislative Information. California Code CIV 1793.22 Check your warranty paperwork for a manufacturer address designated for lemon-law notices, and send written notice early rather than waiting until you are ready to file. The 30-day out-of-service presumption does not require direct notice.
Who and What the Law Covers
The Song-Beverly Act covers people who buy or lease a motor vehicle in California primarily for personal, family, or household use, including cars, trucks, SUVs, and vans. The vehicle must come with the manufacturer’s express written warranty at the time of sale. Small businesses also qualify if they own fewer than five vehicles and the vehicle in question has a gross weight under 10,000 pounds.2Department of Consumer Affairs. California’s Lemon Law Q&A
Used vehicles are not automatically excluded. Under Civil Code Section 1795.5, a used car sold with an express dealer warranty carries the same protections, with the dealer who issued the warranty on the hook instead of the original manufacturer.3California Legislative Information. California Code CIV 1795.5 A used car bought “as-is” with no written warranty is outside the law. Certified pre-owned vehicles usually carry a manufacturer-backed warranty, which brings them back under the Act.
Motorhome coverage is limited. The law reaches the chassis, cab, and drivetrain, but not the living-quarters portion of the vehicle. Defects in the habitation section cannot force a full refund or replacement under the lemon law.4California Legislative Information. California Code CIV 1793.2
Refund or Replacement: What You Actually Get
When a vehicle qualifies, you choose between a refund and a replacement. The manufacturer cannot force a replacement on you if you want your money back.4California Legislative Information. California Code CIV 1793.2
How the Refund Is Calculated
A refund covers the actual price you paid, including transportation charges and manufacturer-installed options, plus collateral costs: sales tax, license fees, registration, and other official charges. Aftermarket parts installed by the dealer or by you are excluded.4California Legislative Information. California Code CIV 1793.2
The manufacturer gets a mileage offset for use before the first repair attempt. The formula: purchase price multiplied by the mileage at the first repair visit, divided by 120,000. On a $40,000 car first brought in at 3,000 miles, the offset is $1,000, so the base refund is $39,000 before taxes and fees are added back.
Replacement
A replacement must be a substantially identical new vehicle, with all standard warranties. The manufacturer also pays the sales tax, registration, and license fees tied to the new vehicle.4California Legislative Information. California Code CIV 1793.2
Incidental Costs
On top of the refund or replacement, you can recover reasonable out-of-pocket costs caused by the defective vehicle. The statute specifically names towing charges, rental car costs, and repair expenses not covered by the warranty.4California Legislative Information. California Code CIV 1793.2 Keep every receipt. These apply whether you take replacement or refund.
Attorney Fees and the Civil Penalty
If you win, the court orders the manufacturer to pay your attorney fees and litigation costs based on actual time spent.5California Legislative Information. California Code CIV 1794 Because of that fee-shifting rule, most lemon-law attorneys take cases on contingency with no money up front.
If the manufacturer’s failure to replace or refund was willful, the court can add a civil penalty of up to two times your actual damages. A $40,000 buyback can become a judgment of up to $120,000. The manufacturer can avoid the penalty by maintaining a certified arbitration program or by complying with your demand within 30 days of receiving written notice.5California Legislative Information. California Code CIV 1794 That is why a proper written demand before suit matters: it starts the clock.
When Claims Get Denied
Not every mechanical problem qualifies, and manufacturers push back often. The main exclusions:
- Problems caused by aftermarket parts you or the dealer installed, such as custom exhaust or non-factory suspension.
- Defects the manufacturer can trace to abuse, neglect, skipped maintenance, or unauthorized modifications.
- New defects that appear after the manufacturer’s express warranty has expired. The lemon-law presumption rides on an active warranty.
Manufacturers sometimes blame owner misuse when the real cause is a factory defect. If your claim is denied on those grounds, an independent mechanic’s written assessment carries real weight in arbitration or court.
How to File a Claim
Documentation decides most lemon cases. Start a file at the first repair visit.
What to Collect
Keep every repair order and invoice. Each should list the VIN, the mileage at drop-off, the complaint, and the work performed. Organize them chronologically. Also keep your purchase or lease agreement, the warranty booklet, current registration, and any emails or texts with the dealer or manufacturer about the defect. The goal is a clean timeline showing repeated failures to fix the same issue.
The Demand Letter
Before arbitration or court, send the manufacturer a written demand. Describe the defect, list the repair dates and outcomes, give the dealership name and your VIN, and state the total days the vehicle was in the shop. Say whether you want a refund or a replacement. Send it certified mail with return receipt. The delivery date matters for the 30-day cure period under Section 1794.
Certified Arbitration
California’s Department of Consumer Affairs certifies arbitration programs that resolve lemon disputes without a trial, and they are free to consumers.6Department of Consumer Affairs. Arbitration Certification Program Not every manufacturer participates, so check your warranty booklet. Where a program exists, the arbitrator typically decides within 40 days, and if you accept the decision, the manufacturer has 30 days to comply.7Department of Consumer Affairs. Frequently Asked Questions – Arbitration Certification Program You are not required to arbitrate before suing, but skipping a certified program the manufacturer offers can affect civil-penalty exposure.
Going to Court
If you reject the arbitrator’s decision, or the manufacturer has no certified program, you can file in court. Small claims is an option for smaller amounts.
The Four-Year Deadline
You have four years to file a lemon-law claim. The clock starts when you discover, or reasonably should have discovered, the defect. Do not confuse this with the 18-month, 18,000-mile presumption window: that window decides whether the shortcut applies; the four-year deadline decides whether you can file at all. Waiting too long after a defect appears, even while still under warranty, can cost you the claim.
Federal Backup: The Magnuson-Moss Warranty Act
California’s statute is not your only route. The federal Magnuson-Moss Warranty Act applies to any consumer product sold with a written warranty, including vehicles, and lets you sue in state or federal court when a manufacturer fails to honor it.8Federal Trade Commission. Magnuson Moss Warranty-Federal Trade Commission Improvements Act It also shifts attorney fees and costs to the manufacturer if you prevail.9Office of the Law Revision Counsel. 15 USC 2310 – Remedies in Consumer Disputes Many lemon-law attorneys file under both statutes at once. The federal act is useful when the state presumption window has closed but the warranty is still active.