Late-Appearing Product Injury Deadlines

Some product injuries are obvious the moment they happen: a ladder collapses, a blade flies off, a heater catches fire. Others build slowly. A medical implant can fail years after surgery, a drug's side effect can surface long after the first dose, and an illness from a chemical exposure can take a long time to diagnose. In defective product cases like these, the hardest legal question is often not whether there is a claim, but when the time to file it started.

This guide explains the two-year rule, the discovery rule that can delay it, the special statutes for toxic and asbestos exposure, and the traps that cut a late-discovered claim short.

How do I work out my deadline, step by step?

Write down when the harm first appeared. Note the first symptom, the first visit to a doctor, and the date any diagnosis was made.
Write down when you first suspected a cause. The discovery rule asks when you suspected, or a reasonable person would have suspected, that the harm was caused by someone's wrongful conduct (CACI 455). A doctor's remark, a news story or a recall letter can each be part of that picture.
Decide whether this is an exposure case. Illness or injury from a hazardous material or toxic substance is governed by Code of Civil Procedure 340.8, and asbestos by section 340.2, each with its own wording.
Separate the product claim from any claim against a doctor or hospital. Professional negligence by a health care provider has its own deadline in Code of Civil Procedure 340.5, and section 340.8 does not apply to those claims.
Check for a pause. For a person who was a minor or lacked legal capacity when the claim arose, that time does not count (Code of Civil Procedure 352).
Count from the earliest date that could apply. Whether the discovery rule applies is often disputed, so planning around the earliest possible date, rather than the latest, keeps the claim safe.
File and name unknown companies by a fictitious name if needed. A complaint can name a defendant whose true name is unknown and be amended when the name is discovered (Code of Civil Procedure 474).

Which deadline applies to my product injury?

Situation	When time runs	Source
Injury from a product, noticed when it happens	2 years from the injury	Code of Civil Procedure 335.1
Harm or its wrongful cause could not reasonably be suspected at first	2 years from when you suspected, or a reasonable person would have suspected, harm caused by someone's wrongful conduct; or later, if a reasonable investigation would not have revealed the product's role	CACI 455
Injury or illness from exposure to a hazardous material or toxic substance	The later of 2 years from the injury, or 2 years after you became aware, or reasonably should have, of the injury, its physical cause, and facts pointing to someone's wrongful act	Code of Civil Procedure 340.8(a)
Death from such an exposure	The later of 2 years from the death, or 2 years from when the family knew, or reasonably should have known, its physical cause and facts pointing to someone's wrongful act	Code of Civil Procedure 340.8(b)
Injury or illness from asbestos exposure	The later of 1 year after first suffering disability, or 1 year after learning, or reasonably should have learned, that the disability was caused by the exposure	Code of Civil Procedure 340.2
Injured person was a minor or lacked legal capacity	That time is not counted (except for claims that must first go to a public entity)	Code of Civil Procedure 352

What does it mean to "discover" a product injury?

The Judicial Council's instruction on delayed discovery gives the jury two ways to find that a late lawsuit was still on time. The first is that, before the cutoff date, the injured person did not discover, and did not know of facts that would have caused a reasonable person to suspect, that they had suffered harm caused by someone's wrongful conduct. The second is that a reasonable and diligent investigation would not have disclosed that a particular fact, such as a product defect, contributed to the harm (CACI 455). The injured person carries the burden of proving either one.

Courts read "suspect" broadly. A decision the Judicial Council quotes under CACI 455 says a person discovers a claim when he at least suspects that someone has done something wrong to him, using "wrong" in its everyday sense, not a technical legal one. Another quoted decision says it is the discovery of facts, not their legal significance, that starts the clock. So the clock can start even if you have no idea that a product claim exists, once you know you were harmed and suspect a wrongful cause.

Suspicion also brings a duty to look. A decision quoted under CACI 455 says that once a suspicion exists, the injured person must go find the facts and cannot wait for the facts to find them. People are charged with what a reasonable investigation would have revealed.

Can the clock start later for the product than for the doctor?

Yes, and this matters most for medical devices. The Judicial Council's notes to CACI 455 describe a California Supreme Court case in which a patient suspected her surgeon's negligence and sued the surgeon on time. The discovery rule could still delay the start of her product claim against the maker of medical staples used in the operation, because the staples' role in her injury was not known and could not reasonably have been discovered within the time running from the injury. A decision quoted under CACI 455 sums up the point: claims based on two independent legal theories against two separate defendants can accrue at different times.

That rule cuts both ways. It can save a product claim discovered late, but it does not stop the clock on a claim you already suspect. And the deadline against a health care provider is set by its own statute: three years from the injury or one year from when the injury was discovered or should have been, whichever comes first, with narrow exceptions (Code of Civil Procedure 340.5).

How is a toxic exposure claim different?

For an injury or illness based on exposure to a hazardous material or toxic substance, the Legislature wrote the discovery rule into the statute. The lawsuit is due no later than two years from the injury, or two years after the injured person becomes aware, or reasonably should have become aware, of three things: the injury, its physical cause, and enough facts to put a reasonable person on notice that someone's wrongful act caused or contributed to it, whichever is later (Code of Civil Procedure 340.8(a)).

Two details help people exposed to a product. Media reports about the contamination do not, by themselves, put a reasonable person on notice that someone's wrongful act caused the injury (Code of Civil Procedure 340.8(c)(2)). And a family bringing a wrongful death claim from such an exposure gets a parallel rule, running from the death or from when they knew or should have known its physical cause and the wrongdoing (Code of Civil Procedure 340.8(b)). Asbestos claims are excluded from section 340.8 and follow section 340.2, which uses one-year periods tied to disability, defined as loss of time from work that prevents performing one's regular occupation.

Does a worsening injury restart the clock?

No. A decision the Judicial Council quotes under CACI 455 says the time bar starts running when the person first learns of an actionable injury, even if the injury lingers or gets worse. If a product injury that seemed minor later becomes serious, the deadline still runs from the first discovery, not from the day it became serious.

Not knowing who made the product does not stop the clock either. A decision quoted under CACI 455 says ignorance of the identity of the defendant generally will not toll the statute, because identity is not an element of the claim. The answer is to file on time and name unknown companies by a fictitious name under Code of Civil Procedure 474. Our guide on suing the store or seller that sold a defective product explains why the seller is often easier to identify than the maker.

What changes the answer?

The injured person is a child. The years before age 18 are not counted for claims against private companies (Code of Civil Procedure 352). Our guide on injury claims for children explains the rest of a child's case.

A family member died. For exposure deaths, section 340.8(b) applies. For other deaths, the general two-year rule in Code of Civil Procedure 335.1 covers an action for the death of a person; see how long a family has to file a wrongful death claim.

The exposure happened at work. Workers' compensation does not bar a claim against the product's maker (Labor Code 3852); see injuries at work from a defective product.

The company's own words caused the delay. If a defendant said or did something that caused you to believe a lawsuit was not necessary, and you reasonably relied on it, the defendant may be stopped from relying on the deadline (CACI 456). The court decides that question.

The defect type matters to what you had to notice. A hidden manufacturing flaw, a design risk and a missing warning can each come to light at different times; see the three kinds of product defect.

What could this look like? An example

For example, imagine a Santa Rosa retiree who has a knee replacement in May 2023. He has mild pain through 2024, which his doctor treats as normal recovery. In March 2025, a second surgery finds that one component of the implant has cracked, and the surgeon tells him the part failed.

The company may argue the clock started with the pain in 2023. He would answer that, before March 2025, he neither suspected nor had facts that would make a reasonable person suspect that a wrongful act caused his pain, because his doctor told him the pain was expected. If the jury agrees, the two years run from March 2025, so the lawsuit is due by March 2027. If he also believes the first surgeon was negligent, that separate claim runs on the shorter health care provider clock in section 340.5. The safe plan is still to file well before the earliest date the company could argue. This example is made up to show how the rules fit together; it says nothing about any real case.

What mistakes do people make with late-appearing injuries?

Assuming the clock starts at diagnosis, when it may have started at the first suspicion of a wrongful cause.
Waiting to learn the manufacturer's name before filing, when unknown companies can be named by a fictitious name.
Waiting for the injury to get worse, or to stop getting worse, when worsening does not restart the clock.
Discarding the removed implant or the used product, which may be the only proof of the defect.
Treating the claim against a doctor and the claim against a product maker as one deadline.

What should I do this week?

Make a timeline of the first symptom, each doctor visit, each diagnosis, and the day you first suspected the product.
Ask your doctors and hospital for your records, including operative reports and the implant or lot number if a device is involved.
Ask in writing that any removed implant or device be preserved, and keep any product or container you still have.
Save recall letters, warnings and news about the product, with the date you first saw each.
Read our guide to California personal injury deadlines for the other clocks that may apply.
Speak with a lawyer before the earliest date the company could argue, not the latest date you hope for.

Frequently asked questions

Who has to prove when I discovered the injury?

A decision the Judicial Council quotes under CACI 454 says the deadline is raised as an affirmative defense, subject to proof by the defendant. But if the harm happened before the cutoff date, the injured person must prove the facts of delayed discovery (CACI 455).

Does a recall notice start the clock?

It can be part of what a reasonable person knew. The question is whether you had facts that would make a reasonable person suspect your harm came from someone's wrongful conduct (CACI 455). For toxic exposure, news reports alone are not enough (Code of Civil Procedure 340.8(c)(2)).

Is the deadline different for a drug or a medical device?

The product claim follows the same two-year rule with the discovery rule. A claim against the prescribing doctor or the hospital follows the separate health care provider statute (Code of Civil Procedure 340.5).

Can a judge decide the deadline before trial?

Decisions the Judicial Council quotes under CACI 454 say that when the clock started is usually a question of fact, though it can be decided as a matter of law when the material facts are not disputed.

Where would the lawsuit be filed?

An injury lawsuit may be filed in the county where the injury happened or where a defendant lives (Code of Civil Procedure 395). Our guide to Sonoma County Superior Court in an injury case covers what follows filing here.

Can punitive damages be claimed in a late-discovered case?

The timing rules are the same for the whole claim. Whether punitive damages are available depends on proof of malice, oppression or fraud; see punitive damages against a manufacturer.

If a product injury surfaced months or years after you used the product, contact Young Law Group today at (707) 343-0556 or through our contact page for a free consultation about your deadline.

When does the deadline start if a product injury shows up later?