Tesla Battery Degradation and Range Loss Under California's Lemon Law

Is Tesla battery degradation covered by California's lemon law?

Yes, battery degradation can be covered by California's lemon law when it goes beyond what Tesla's own battery warranty allows, or when it arrives together with battery fault warnings, charging problems, or power reduction; gradual range loss within the range Tesla calls normal usually is not. The Song-Beverly Consumer Warranty Act ties your rights to the manufacturer's written warranty: under Civil Code section 1793.2(d)(2), if Tesla cannot repair a warranty-covered defect that substantially impairs the vehicle's use, value, or safety after a reasonable number of attempts, it must replace the vehicle or refund your money, at your choice.

This page is part of our broader Tesla lemon law guide, which covers the other defect patterns Tesla owners report most often. For the statute itself, start with the California lemon law overview.

What does Tesla's battery warranty actually promise?

Tesla's battery and drive unit warranty runs eight years with a mileage cap that varies by model, and it guarantees the high-voltage battery will retain a minimum of 70 percent of its capacity over the warranty period. This is a separate, longer warranty than the basic vehicle warranty, and that structure is common across EV makers. Current Tesla mileage caps have generally been reported as 100,000 to 150,000 miles depending on the model and trim.

Two details matter in practice. First, Tesla measures capacity with its own diagnostics, not the range number displayed on your screen, which moves with temperature, driving style, and software calibration. Second, the warranty promises a floor, not a schedule: it does not tell you how fast degradation is allowed to happen on the way down.

When does EV range loss count as a lemon law nonconformity?

Range loss counts as a nonconformity when it substantially impairs the vehicle's use, value, or safety to a reasonable person in your position, which in practice means sudden or severe loss, repeated battery error messages, charging restrictions, or a vehicle that can no longer reliably do what it was sold to do. A commuter car that loses a quarter of its rated range in two years is a very different situation from one that drifts down a few percent per year.

There is a genuinely unsettled legal question underneath these cases: how the warranty's 70 percent retention threshold interacts with Song-Beverly's substantial impairment standard. Manufacturers tend to argue that degradation above the contractual floor is warranted behavior, so there is no defect at all. The consumer-side response is that the threshold defines when Tesla owes a battery replacement under the warranty, not the ceiling on what counts as substantial impairment of use or value under the statute. A steep, early loss of range could impair value in a way a reasonable buyer would care about even if capacity technically sits above 70 percent.

How many repair attempts does Tesla get for a battery problem?

Tesla gets a "reasonable number" of repair attempts, and California law presumes that number has been reached in specific situations described in the Tanner Consumer Protection Act, Civil Code section 1793.22. Within the first 18 months or 18,000 miles, the presumption applies if there were two or more repair attempts for a defect likely to cause death or serious bodily injury, four or more attempts for the same nonconformity, or a cumulative total of more than 30 calendar days out of service for warranty repairs. Battery defects that cause sudden power loss on the highway may fit the two-attempt safety prong; degradation and charging complaints more often travel under the four-attempt or 30-day prongs.

Tesla service is unusual because so much happens remotely. Tesla frequently responds to battery and charging complaints with over-the-air software updates rather than a service visit, and whether an OTA update counts as a "repair attempt" under the statute is an open question. We look at this question in more depth on our Tesla ADAS and phantom braking page. Either way, create a paper trail: request service in the app, keep the message threads, and ask for an invoice for every visit, even ones where Tesla says no problem was found.

What would a Tesla battery buyback include?

A buyback refunds your down payment, your monthly payments to date, your loan or lease payoff, and official fees, minus one deduction: a mileage offset for the miles you drove before the first repair attempt for the defect. The offset formula comes from Civil Code section 1793.2(d)(2)(C): miles at the first repair attempt, divided by 120,000, times the price you paid. You can run your own numbers with our lemon law buyback calculator.

If Tesla knew the vehicle qualified and did not promptly buy it back, a court can add a civil penalty of up to two times your damages under Civil Code section 1794(c). And under section 1794(d), the manufacturer pays a prevailing consumer's attorney fees and costs, which is why consultations here are free.

Does AB 1755 apply to a Tesla battery claim?

No, not as of July 6, 2026. AB 1755 and SB 26 created an opt-in system with a shorter filing deadline, a mandatory pre-suit notice to preserve civil penalties, and mandatory mediation, and Tesla is not on the DCA's published list of manufacturers that elected in, so the older Song-Beverly rules apply to Tesla claims. GM, Ford, and FCA US are on the list; Toyota and Honda are not. A manufacturer can elect in at any time and appears on the list within two business days, so check Tesla's current status on the Department of Consumer Affairs opt-in list when your claim starts. Our AB 1755 hub explains what changed and why the old online guides are now wrong for opted-in manufacturers.