If your vehicle has a defect that the manufacturer has failed to repair, understanding your filing deadline is just as important as understanding your rights. Miss the window and your claim can be barred entirely, regardless of how strong the underlying facts are. Before diving in, if you have not already read our article on how the mileage offset formula works and how it affects your total recovery, that is a good place to start. In California, the answer to “how long do I have?” now depends on a threshold question: has your vehicle’s manufacturer opted into California’s updated 2025 lemon law procedures?
The Two Sets of Rules
California currently operates two parallel frameworks for lemon law claims, depending on whether the vehicle’s manufacturer has chosen to participate in the procedures established by Assembly Bill 1755 and Senate Bill 26, codified at Code of Civil Procedure Sections 871.20 through 871.30.
If your manufacturer has not opted in:
The standard limitations period applies. Under California Commercial Code Section 2725, breach of warranty claims are generally subject to a four-year window. For lemon law purposes under the pre-2025 framework, that window typically opened when the claim arose, meaning when the vehicle had a qualifying defect that had not been repaired after a reasonable number of attempts. There was historically some gray area about the precise start date, but the practical rule was that most consumers had four years from the point the vehicle arguably qualified for lemon law relief.
If your manufacturer has opted in to the 2025 rules:
A different and stricter framework applies under CCP Section 871.21. A claim must be filed within one year after the applicable express warranty expires, and in no event later than six years from the date the vehicle was originally delivered to its first owner. Whichever deadline comes first controls.
This matters more than it might initially appear. If your vehicle has a three-year bumper-to-bumper warranty, the one-year post-expiration rule means the window closes four years from original delivery, not six. If your vehicle has a longer warranty, the six-year cap from original delivery can cut off your claim before the warranty even expires. And critically, the six-year clock runs from delivery to the first owner, not from when you purchased the vehicle if you were not the original buyer.
Why the 2025 Rules Can Be Shorter Than They Sound
Under the old framework, a consumer with a five-year powertrain warranty theoretically had until four years after that warranty expired to bring a claim, potentially up to nine years from delivery in some cases. Under the 2025 opt-in rules, the absolute outer limit is six years from original delivery, full stop.
The California Legislature’s own bill analysis of AB 1755 acknowledged this directly: consumer advocates raised concerns that the six-year cap effectively nullifies longer electric vehicle battery warranties and ten-year emissions warranties, because claims cannot be brought more than six years after delivery, regardless of how long the warranty runs.
The six-year cap also has no exception for defects that only became apparent late in the vehicle’s life. If the clock has run, the claim is barred.
How to Find Out Which Rules Apply to Your Vehicle
The California Department of Consumer Affairs Arbitration Certification Program maintains the official list of manufacturers that have opted into the 2025 procedures. The list is published at dca.ca.gov/acp/accepted_manufacturers.shtml and is required to be updated annually by December 15 of each year. The opt-in is an irrevocable five-year commitment. Once a manufacturer elects to participate, the new rules apply to their vehicles for that entire term.
Manufacturers that have not opted in remain subject to the standard pre-2025 framework under Song-Beverly and the Commercial Code. If you are unsure which category your manufacturer falls into, an attorney can verify this quickly and tell you exactly which deadline governs your claim.
The Consequences of Waiting
Under either framework, the consequences of missing the filing deadline are severe. A claim filed one day after the limitations period expires can be dismissed entirely, no matter how many failed repair attempts are documented, no matter how clear the defect, and no matter how uncooperative the manufacturer has been. Beyond the legal deadline, there are practical reasons to act sooner rather than later. Repair records, dealership documentation, and communications with the manufacturer are easier to gather while the events are recent.
A Free Consultation Costs Nothing. A Missed Deadline Costs Everything.
This article is general information only. Which limitations period governs your claim, whether any tolling applies, and whether you are still within the filing window are all fact-specific questions that depend on your vehicle, your manufacturer, your warranty, and your timeline.
The team at AutoLawFirm.com offers free case reviews and can confirm in short order which rules apply to your situation and whether your claim is still timely. If your vehicle has been back for the same repair more than once, do not wait to find out.
Reach out at https://autolawfirm.com/contact/ to get started.
This article is general information only and does not constitute legal advice. Consult a qualified California lemon law attorney about your specific situation.