What Is Product Liability Law in California? A Complete Guide for Injured Consumers

By Jillian F. Hayes, Esq. · Last updated May 20, 2026

The Origin of California Product Liability Law

The story starts with a power tool and a Christmas gift. William Greenman received a Shopsmith combination power tool from his wife in 1955. Two years later, a piece of wood flew out of the lathe attachment and struck him in the forehead, causing serious injury. He sued the manufacturer.

When the case reached the California Supreme Court in 1963, Justice Roger Traynor wrote an opinion that changed American product liability law. The court held that a manufacturer is strictly liable in tort when it places a product on the market, knowing it is to be used without inspection for defects, and the product proves to have a defect that causes injury. That was Greenman v. Yuba Power Products, 59 Cal.2d 57. Within a few years, courts in dozens of other states adopted the same rule.

Three other California cases built on Greenman and shaped the modern framework:

• Cronin v. J.B.E. Olson Corp. (1972) removed the requirement that a plaintiff prove the product was "unreasonably dangerous." A defect is enough.
• Barker v. Lull Engineering (1978) set out the two tests for design defect: the consumer expectations test and the risk-benefit test.
• Soule v. General Motors Corp. (1994) clarified when each Barker test applies. The consumer expectations test is appropriate when ordinary consumers can form expectations about safety. The risk-benefit test is for complex products where consumer expectations alone don't tell the story.

These decisions are still cited in San Diego product liability litigation today. They explain why California is among the most plaintiff-favorable states for these claims.

Strict Liability vs. Negligence vs. Warranty

An injured person can usually pursue three legal theories at once. The complaint will plead all of them and let discovery sort out which sticks. Each has different elements.

The Three Types of Defects Recognized in California

A product is defective under California law if it falls into one of three categories. The classification matters because the legal standard for proving each type is different.

Design Defect

The product was designed dangerously, even though manufactured exactly as intended. Every unit coming off the line carries the same risk. California uses two tests, set out in Barker v. Lull Engineering:

• Consumer Expectations Test. Did the product perform as safely as an ordinary consumer would expect when used in a reasonably foreseeable way? If not, it's defective.
• Risk-Benefit Test. Once the plaintiff shows the design caused the injury, the burden shifts to the manufacturer to prove the benefits of the design outweigh the risks. This is the test for technically complex products.

Manufacturing Defect

The product's design was safe, but something went wrong during production on the specific unit that caused injury. A car with a defective airbag inflator. A bottle of soda with a glass shard inside. The defect is in the individual product, not the design as a whole.

Warning Defect (Failure to Warn)

The product carries an inherent risk that could be reduced or eliminated by a warning, and the manufacturer didn't provide an adequate one. The classic example is a prescription drug with undisclosed side effects. Power tools, household chemicals, and medical devices are common subjects of failure-to-warn claims.

Who Can Be Held Liable in a California Product Liability Case?

California's strict liability doctrine reaches everyone in the commercial chain of distribution. That's broader than most states.

• Manufacturer. The party that designed and built the product. Always a defendant when identifiable.
• Component manufacturer. The maker of a defective part inside a larger product.
• Distributor or wholesaler. Anyone in the chain between manufacturer and retailer.
• Retailer. The store or website that sold the product to the consumer.
• Importer. Treated as the manufacturer for products made overseas.
• E-commerce platforms. Under Bolger v. Amazon.com (2020) and Loomis v. Amazon.com (2021), online marketplaces like Amazon can be strictly liable for defective third-party products in many cases.

The rule exists because California courts decided long ago that the entity in the best position to identify and prevent defects (or to insure against them) should bear the loss when injuries happen. Spreading liability across the chain encourages safer products throughout it.

Damages Available in a California Product Liability Claim

California allows two main categories of compensatory damages, plus punitive damages in qualifying cases.

Economic Damages

• Past and future medical expenses (treatment, surgery, rehab, prescriptions)
• Lost wages and lost future earning capacity
• Property damage
• Out-of-pocket costs related to the injury

Non-Economic Damages

• Physical pain and suffering
• Mental and emotional distress
• Loss of enjoyment of life
• Disfigurement and scarring
• Loss of consortium (claim brought by spouse)

Punitive Damages

Under California Civil Code Section 3294, punitive damages are available when the defendant acted with malice, oppression, or fraud. These awards are intended to punish and deter. They typically require clear and convincing evidence (a higher standard than the preponderance standard for compensatory damages). Punitive awards have constitutional limits but can be substantial when warranted.

One technical note specific to California: Proposition 51, codified at Civil Code Section 1431.2, makes defendants severally liable (not jointly) for non-economic damages. Each defendant pays its percentage of fault for pain and suffering, not the whole thing. Economic damages remain joint and several.

Statute of Limitations and Discovery Rule

The general rule is two years from the date of injury under CCP Section 335.1. Wrongful death claims run two years from the date of death. There are exceptions:

• Discovery rule. When an injury (or its cause) was not reasonably discoverable at the time it happened, the clock starts when the plaintiff knew or should have known. This often applies in toxic exposure and pharmaceutical cases.
• Toxic exposure. CCP Section 340.8 provides a two-year limit from the date the plaintiff knew or should have known the injury was caused by toxic exposure.
• Minors. The statute of limitations is typically tolled until the minor turns 18, then runs for the standard two years.
• Latent defect cases. Some product defects (asbestos exposure, medical implants) don't manifest for years. California courts have recognized exceptions for genuinely hidden injuries.

Even with these exceptions, the safest course is to consult a product liability attorney quickly. Most exceptions are narrow and depend on specific factual showings.

Frequently Asked Questions

What is product liability law in California?

It's the area of law that holds manufacturers, distributors, and retailers responsible when a defective product injures someone. California uses strict liability, meaning an injured plaintiff only has to prove the product was defective and caused the injury, not that the defendant was negligent.

What are the three types of product defects in California?

Design defect (the design itself is dangerous), manufacturing defect (something went wrong on the assembly line), and warning defect (the product is dangerous and the warning is inadequate).

Do I have to prove negligence?

No. Strict liability doesn't require proof of negligence. Most California product liability cases are pleaded under strict liability, negligence, and breach of warranty at the same time, but strict liability is the simplest path.

How long do I have to file a product liability lawsuit?

Two years from the date of injury under CCP Section 335.1. Some exceptions apply for delayed discovery, toxic exposure, and minors.

Can I sue the seller if I don't know who made the product?

Yes. California's chain-of-distribution rule applies strict liability to retailers and platforms, not just manufacturers. Bolger v. Amazon in 2020 confirmed this includes some online marketplaces.

What damages can I recover?

Economic damages (medical bills, lost wages), non-economic damages (pain and suffering), and in qualifying cases, punitive damages under Civil Code Section 3294.

What's the difference between strict liability and negligence?

Strict liability focuses on the product. Negligence focuses on the defendant's conduct. Strict liability is easier to prove and is the standard framework in California consumer product cases.

Does product liability law apply to used products?

Sometimes. Commercial sellers of used products can face strict liability in some circumstances. Private casual sales generally cannot.