Greenman v. Yuba Power Products (1963) 59 Cal.2d 57; CACI Nos. 1201, 1203, 1204, 1205
Strict products liability: the claim California invented, and its two tests for design defect
A claim in California superior courts · Last verified August 26, 2026
California invented this claim. Greenman v. Yuba Power Products (1963) 59 Cal.2d 57 held that a manufacturer who puts a defective product on the market is liable for the injuries it causes whether or not it was negligent — and the rest of the country followed.
You do not prove carelessness. You prove the product was defective.
The live question in most cases is not whether the rule applies but which design-defect test you get, because one of them shifts the burden of proof onto the manufacturer and the other does not.
What the claim is
A product was defective when it left the defendant's hands, and the defect caused your injury.
Three kinds of defect:
Manufacturing defect — this unit came out wrong. It differs from the manufacturer's own design or from other units off the same line. The easiest to prove, because the manufacturer's own specification supplies the standard.
Design defect — the whole line is built this way, and the design itself is unreasonably dangerous.
Failure to warn — the product carried a risk known or knowable in light of the scientific knowledge available at the time, and the warning was absent or inadequate.
Where the right comes from
Common law. There is no products liability statute in California; the claim is judge-made and still is.
Greenman (1963) created it. Justice Traynor had argued for it in a concurrence eighteen years earlier, and Greenman adopted it outright: liability attaches to putting a defective product on the market, not to any failure of care.
What a plaintiff has to prove
The CACI 1200 series states the elements, and the instruction depends on the theory:
- CACI 1201 — manufacturing defect
- CACI 1203 — design defect, consumer expectations test
- CACI 1204 — design defect, risk-benefit test
- CACI 1205 — failure to warn
Across all three theories: the defendant made, distributed, or sold the product; the product was defective when it left the defendant's possession; the plaintiff was harmed; and the defect was a substantial factor in causing the harm.
The two design-defect tests — and why the choice decides cases
Barker v. Lull Engineering Co. (1978) 20 Cal.3d 413 gave California two alternative tests, and a plaintiff may prevail under either.
The consumer expectations test. The product failed to perform as safely as an ordinary consumer would expect when using it in a reasonably foreseeable way. The plaintiff carries this.
The risk-benefit test. The design's risks outweigh its benefits, weighing the gravity of the danger, the likelihood it would occur, the feasibility of a safer alternative design, the cost of that alternative, and the adverse consequences of changing the design. Once the plaintiff shows the design caused the injury, the burden shifts to the defendant to prove the benefits outweigh the risks.
That burden shift is the single most valuable feature of the claim, and it is why the choice of test is fought over.
But the plaintiff does not always get to choose. In Soule v. General Motors Corp. (1994) 8 Cal.4th 548, the Supreme Court held it is error to give the consumer-expectations instruction where the minimum safety of the product is beyond the everyday experience of its users. The case involved whether a wheel assembly should have collapsed into the passenger compartment in a particular collision — a question no ordinary driver has expectations about, and one that required expert testimony.
The practical rule: the more technical the design question, the more likely the case goes to risk-benefit. Consumer expectations survives for products whose ordinary use tells a jury what safety to expect.
How long you have to file
Two years for personal injury, under CCP § 335.1.
Three years for damage to property, under CCP § 338 — the same split that runs through California tort practice and that catches people who assume one deadline covers the whole case.
The discovery rule applies, which matters because a defect is often not identifiable at the moment of injury. The clock runs when the plaintiff knew or should have known of the injury and its negligent cause.
Toxic exposure claims have their own section. CCP § 340.8 supplies a two-year period for injury from exposure to a hazardous material or toxic substance, with its own accrual rule.
What has to happen before you file
Nothing.
Unless a public entity is a defendant, in which case the Government Claims Act presentation requirement applies — six months, and it is the trap that runs through every California tort claim.
There is no notice requirement to the manufacturer, and no requirement to preserve or return the product, though destroying it creates a serious spoliation problem that functions like one.
Who can be sued — and who cannot
Everyone in the chain of distribution. Manufacturer, distributor, wholesaler, retailer. A retailer who never opened the box is strictly liable, which surprises people and is deliberate — the rule places the loss on the enterprise that profited from putting the product into commerce.
Not a casual seller. Someone selling their own used goods is outside the doctrine.
Not a provider of services, where the product is incidental to the service.
And not, generally, for another manufacturer's product. In O'Neil v. Crane Co. (2012) 53 Cal.4th 335, the Supreme Court held a manufacturer is not liable for harm caused by another manufacturer's product or replacement part — unless its own product contributed substantially to the harm, or it participated substantially in creating a harmful combined use. That decision closed off a large category of asbestos claims against makers of equipment that others' asbestos parts were later fitted to.
The component parts doctrine limits a supplier of a non-defective component incorporated into a finished product. The sophisticated user doctrine defeats a failure-to-warn claim where the plaintiff knew or should have known the risk by virtue of their position or training.
Common defenses
No defect — the product performed as designed and the design was sound.
The risk-benefit balance, where the defendant carries the burden and often welcomes it.
Beyond the state of the art, on failure to warn: the risk was neither known nor knowable given the scientific knowledge available when the product was sold.
Misuse or alteration that was not reasonably foreseeable.
The sophisticated user and component parts doctrines.
Comparative fault. California applies pure comparative principles here — the plaintiff's own carelessness reduces recovery rather than barring it.
Proposition 51, at Civil Code § 1431.2 — a defendant is severally liable for non-economic damages in proportion to fault, while remaining jointly liable for economic damages. In a multi-defendant products case that division does most of the work at judgment.
The economic loss rule. Seely v. White Motor Co. (1965) 63 Cal.2d 9 — also a California decision — bars strict liability recovery for pure economic loss. A product that damages only itself, or that merely fails to be worth what was paid, is a contract and warranty problem, not a tort one. That boundary is why the implied warranty and Song-Beverly claims exist alongside this one.
What the claim pays
Personal injury damages — medical expenses, lost earnings, future care, and pain and suffering.
Property damage to property other than the product itself.
Not pure economic loss, under Seely. The disappointed purchaser's remedy is warranty.
Punitive damages under Civil Code § 3294, on clear and convincing proof of oppression, fraud, or malice — which in a products case usually means evidence the manufacturer knew of the danger and sold anyway. Section 3295 restricts pretrial discovery of financial condition without a court order.
No fee-shifting. The American rule applies.
Jury trial: yes.
One recent change worth knowing about in a death case. For a survival action — the claim the decedent's estate brings for what the decedent suffered before dying — California briefly allowed recovery of the decedent's own pain, suffering, and disfigurement. That authorisation expired on January 1, 2026. Survival actions filed on or after that date are again limited to economic losses. See CCP § 377.34. A separate wrongful death claim by the statutory heirs under CCP § 377.60 is unaffected, but it compensates the heirs' own loss, not the decedent's suffering.
What people get wrong
"I have to prove the company was careless." You do not. That is the whole point of strict liability. Negligence is a separate theory you may also plead.
"The store just sold it, so they're not liable." A retailer in the chain of distribution is strictly liable.
"I get to use whichever design test I like." Not after Soule. If the safety question is beyond ordinary consumer experience, the case goes to risk-benefit.
"The product broke, so I can sue in tort for what I paid." Not under Seely. Pure economic loss is a warranty claim.
"They made the machine, so they're liable for the part someone else added." Generally not, after O'Neil.
"Negligence per se is my claim." It is an evidentiary presumption under Evidence Code § 669, not a cause of action.
"Personal injury and property damage share a deadline." Two years and three years.
Where it came from
Before 1963, an injured consumer had to prove negligence — often against a manufacturer whose processes they could not see — or find a warranty theory that privity did not defeat. Greenman removed both obstacles at once, and it did so on the reasoning that a manufacturer is better placed than a consumer to absorb and spread the cost of the injuries its products cause.
California then built the architecture around it. Seely (1965) drew the line at economic loss. Barker (1978) supplied the two design tests and the burden shift. Soule (1994) restricted when consumer expectations may be used. O'Neil (2012) limited liability for others' components.
California has diverged from the national trend. The Restatement Third of Torts abandoned the consumer-expectations track for design defect in favour of a single reasonable-alternative-design test. California kept both, which means a plaintiff here retains an option the Restatement would have taken away.
Common questions
Do I have to prove the manufacturer was negligent?
No. Strict liability asks whether the product was defective, not whether anyone was careless. That is what California established in Greenman in 1963.
Can I sue the store that sold it, or only the manufacturer?
Both. Everyone in the chain of distribution — manufacturer, distributor, and retailer — is strictly liable, even a retailer who never opened the box.
What is the difference between the two design-defect tests?
Consumer expectations asks whether the product performed as safely as an ordinary user would expect, and the plaintiff proves it. Risk-benefit weighs the design's risks against its benefits, and the defendant carries the burden. Where the safety question is beyond ordinary experience, Soule requires the risk-benefit test.
How long do I have to sue?
Two years for personal injury, three years for property damage, with the discovery rule available where the defect was not apparent.
Can I recover for the product itself if it failed but hurt no one?
Not in strict liability — Seely bars recovery for pure economic loss. That claim belongs in warranty, under Song-Beverly or the implied warranty of merchantability.
Someone died. Can the estate recover their pain and suffering?
Only if the survival action was filed before January 1, 2026. The authorisation for those damages expired on that date, and survival actions filed since are limited to economic losses.