California Lemon Law: The Song-Beverly Consumer Warranty Act

For most Californians, purchasing a vehicle is the second largest financial transaction of their lives, eclipsed only by buying a home. When that vehicle suffers from chronic, unfixable defects, the financial and emotional toll is staggering. Fortunately, the state does not leave consumers at the mercy of automotive manufacturers. At Law In California, we consider the Song-Beverly Consumer Warranty Act—commonly known as the California Lemon Law—to be one of the most powerful and heavily enforced consumer protection statutes in the world.

Under this law, if an auto manufacturer or its authorized dealers cannot repair a serious warranty defect after a “reasonable number of attempts,” the manufacturer is legally obligated to either replace the vehicle or refund the consumer’s money. This law prevents automakers from trapping consumers in a never-ending cycle of ineffective repairs. This guide explores exactly what qualifies as a “lemon,” the legal presumption that works in your favor, and the financial mechanics of a manufacturer buyback.

The Legal Definition: What Makes a Car a “Lemon”?

Not every car with a mechanical issue qualifies as a lemon. To trigger the protections of the Song-Beverly Act, the vehicle must meet highly specific statutory criteria. First and foremost, the vehicle must have been purchased or leased in California, and the defect must be covered by the manufacturer’s original new-vehicle warranty.

Secondly, the defect must “substantially impair the use, value, or safety of the vehicle.” A rattling speaker grill or a peeling piece of interior trim is frustrating, but it does not substantially impair the vehicle’s safety or core function. However, sudden engine stalling, transmission failure, faulty airbags, or persistent electrical fires are clear, substantial impairments.

Finally, the manufacturer must be given a “reasonable number of attempts” to fix the problem. The law does not define an exact, universal number for “reasonable,” as it varies based on the severity of the defect. However, California law provides a powerful shortcut for consumers known as the Lemon Law Presumption.

The 18-Month / 18,000-Mile Presumption

According to the guidelines established by the California Attorney General’s Office, a vehicle is legally presumed to be a lemon if certain conditions are met within the first 18 months of delivery to the buyer, or within the first 18,000 miles on the odometer—whichever comes first.

The presumption applies if any one of the following occurs within that timeframe:

• Safety Defects: The manufacturer or dealer has made two or more attempts to repair a warranty problem that could result in death or serious bodily injury (e.g., brake failure or steering lockup).
• General Defects: The manufacturer or dealer has made four or more attempts to repair the same substantial warranty problem (e.g., a transmission that continuously slips).
• Days Out of Service: The vehicle has been out of service for warranty repairs for a cumulative total of more than 30 days (not necessarily consecutive).

If your vehicle meets these criteria, the burden of proof shifts in court. You no longer have to prove the car is a lemon; the manufacturer has to prove that it isn’t, which is a monumentally difficult legal task.

The Resolution: Replacement or Buyback

If your vehicle is determined to be a lemon, the manufacturer must offer you a choice: a replacement vehicle of identical value, or a total buyback. Most consumers choose the buyback (refund). By law, the manufacturer must refund your down payment, all monthly payments made to date, and pay off the remaining balance of your loan. They must also reimburse you for collateral charges, such as sales tax, registration fees, and towing or rental car costs incurred due to the defect.

The Mileage Offset Formula

The manufacturer is legally allowed to deduct a “usage fee” from your refund. This accounts for the miles you drove the car problem-free before the defect first appeared. The state enforces a strict mathematical formula to calculate this deduction, using a 120,000-mile life expectancy baseline:

Does the Lemon Law Apply to Used Cars?

Yes, but with caveats. If you purchase a used vehicle that is still covered by the manufacturer’s original factory warranty, the Lemon Law fully applies. Furthermore, if you purchase a Certified Pre-Owned (CPO) vehicle from an authorized dealer that comes with a written warranty, those warranty protections fall under the Song-Beverly Act.

However, if you purchase a used car from an independent lot and the window sticker explicitly says “AS IS – NO WARRANTY,” the Lemon Law does not apply. You assume all financial risk the moment you drive off the lot. If a dealership attempts to hide the vehicle’s history or lies about its mechanical condition during an “As-Is” sale, your legal remedy transitions from the Lemon Law to the statutes governing False Advertising and Dealership Fraud.

The Attorney Fee-Shifting Provision

The most important, pro-consumer aspect of the California Lemon Law is its “fee-shifting” provision. Under the Song-Beverly Act, if the consumer wins the case, the manufacturer is legally required to pay the consumer’s attorney fees and court costs. This levels the playing field, allowing everyday citizens to hire top-tier civil litigators to fight multi-billion dollar auto manufacturers without paying massive upfront retainers.

To ensure your claim is successful, your sole responsibility as a consumer is documentation. Never leave the dealership service department without a printed “Repair Order” that explicitly lists your complaint, the date, the odometer reading, and what the mechanic did (or failed to do) to the vehicle. This paper trail is the absolute foundation of every successful Lemon Law buyback in California.