The California Lemon Law Presumption (§ 1793.22)

California’s lemon-law presumption is the most-cited part of the Song-Beverly Act, and for good reason: it converts a vague “reasonable number of repair attempts” standard into a set of concrete numerical thresholds that, if met, shift the legal burden onto the manufacturer.

The statute in plain language

California Civil Code § 1793.22(b) creates a rebuttable presumption that a vehicle’s manufacturer has failed to conform the vehicle to its express warranty if, within 18 months of delivery or 18,000 miles on the odometer, whichever occurs first, any of the following happens:

1. Four or more repair attempts for the same nonconformity, AND the manufacturer was given direct written notice of the right to a buyback or replacement, AND a final opportunity to fix it; OR
2. Two or more repair attempts for a nonconformity likely to cause death or serious bodily injury if the vehicle is driven, AND the manufacturer was given the same notice and opportunity; OR
3. 30 or more cumulative days out of service for repair of any number of nonconformities — they don’t have to be the same defect.

If any one of those is met, the presumption arises. It’s rebuttable — the manufacturer can argue the defects were caused by the owner, were not “substantial,” or were repaired — but the burden of disproving the lemon shifts from the buyer to the manufacturer.

Why the presumption matters

Without it, a buyer must prove from scratch that the repair attempts were “unreasonable” given the nature of the defect, the safety risk, and the practical effect on the vehicle. That’s a fact-intensive fight where the manufacturer’s expert testimony often dominates. With the presumption, the buyer reaches a baseline of evidence sufficient to win — and the manufacturer must overcome it.

Most California settlements happen because the buyer can credibly point to one of the three triggers. The 30-day cumulative out-of-service count is especially powerful: it doesn’t require the same defect repeating, just total downtime.

What “the same nonconformity” means

For the four-attempts trigger, courts look at whether each visit involved the same underlying problem, not necessarily the same repair code. If your transmission was repaired four different ways for the same hesitation symptom, that counts as one nonconformity with four attempts. Conversely, four visits for completely unrelated issues do not trigger the four-attempts prong (though they may count toward the 30-day total).

The written-notice requirement

The four-attempts and serious-injury triggers both require the buyer to have given the manufacturer direct written notice of the right to a buyback or replacement, and a final opportunity to repair. This is a procedural step buyers often skip — and one some manufacturers’ lawyers attack to defeat the presumption.

The notice doesn’t have to be elaborate. A short letter or email to the manufacturer’s customer-relations department, sent via traceable means, identifying the vehicle, the defect, the prior repair attempts, and demanding either buyback or one final repair attempt is enough. The 30-day cumulative-downtime trigger does not require this notice — only the repair-attempt-count triggers do.

What if you don’t meet the presumption?

Plenty of buyers win lemon-law cases without meeting any presumption threshold. The statute’s actual standard is “a reasonable number of attempts” (§ 1793.2(d)(2)), which is fact-specific. A safety defect repaired twice may already be unreasonable. A non-safety defect repaired four times may also be unreasonable. The presumption is a safe harbor, not a ceiling — falling outside it is not the same as losing.

If your repair record is borderline, the smart move is to get a lemon-law attorney’s free case evaluation before assuming you don’t qualify. They look at facts like:

• How quickly the manufacturer escalated to a “diagnosis” — or didn’t
• Whether the defect was eventually fixed at all
• Whether the buyer was offered a loaner / rental
• The safety implications of the defect
• The mileage and time elapsed since each repair attempt

What to do right now

If you think you might be near the presumption thresholds:

• Pull every repair order, including ones marked “no problem found.” Each line item is a “repair attempt” under § 1793.22.
• Count days out of service, not visits. If the dealer kept your car for 11 days during one visit, that’s 11 days — not 1 day.
• Send written notice the moment you think you’re at the four-attempts threshold. The notice clock matters and skipping it gives the manufacturer a defense.
• Talk to an attorney before responding to a manufacturer “goodwill” offer — those offers often come precisely because the manufacturer recognizes a buyback exposure.

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