California Lemon Law for EVs That Lose Range Overnight

If your electric vehicle seemed healthy at bedtime but woke up missing a big chunk of range, you’re not alone. Many California EV owners report “phantom drain” or unexplained overnight range loss that keeps coming back after software updates or service visits. This post explains, in plain language, how California’s Lemon Law can apply to recurring range-loss issues and what you can do right now to protect your rights—without giving legal advice.

Is Overnight EV Range Loss a Lemon Law Warning?

EVs normally lose a little range while parked. Battery management systems, security cameras, telematics, climate safeguards like cabin overheat protection, and third‑party accessories can nibble a few percent overnight. But if you’re seeing double‑digit drops—say, 10% to 30%—with features turned off, no extreme weather, and no scheduled preconditioning, that can point to a defect. Common culprits include battery module imbalance, a software bug that keeps the car “awake,” a failing 12‑volt battery that triggers constant wake cycles, thermal management faults, or issues with the onboard charger or DC fast‑charge software limits.

California’s Lemon Law (the Song‑Beverly Consumer Warranty Act) requires manufacturers to repair defects covered by the warranty within a reasonable number of attempts. The law applies to EVs and covers components like the high‑voltage battery, battery management systems, and vehicle software if they’re under warranty. If an unresolved defect substantially impairs the vehicle’s use, value, or safety, you may be entitled to remedies such as repurchase, replacement, or other relief under the statute, depending on your facts and options available under the law.

There’s also a legal “presumption” during the first 18 months or 18,000 miles that can make a claim easier to prove in some situations—often triggered by 2 or more repair attempts for a serious safety issue, 4 or more attempts for other problems, or 30+ total days out of service. Outside that window, claims can still succeed; you’re not disqualified just because you’re past 18 months or 18,000 miles. Overnight range loss can affect safety (unexpectedly running low), use (limited commuting or trips), and value (reduced confidence and resale), but every case is fact‑specific. A consultation can help you assess how your situation fits the law.

What California EV Owners Should Document Now

Start with your service paperwork. Each time you visit the dealer, make sure the repair order accurately states your complaint (for example, “Vehicle loses 15–25% state of charge overnight while parked, features disabled”). Ask that diagnostic steps and any fault codes be listed, not just “could not duplicate.” Keep copies of every repair order and invoice, warranty printout, software version noted, and any recall or technical service bulletin references. Record dates, mileage, and days the car is out of service, and save receipts for towing, rideshare, loaner/rental cars, and charging costs tied to the issue.

Create an at‑home range log under controlled conditions. Over several nights, park with a known state of charge (for example, 80%), disable features that can consume energy (Sentry/Cabin Overheat/third‑party dashcams), and note parking location, outside temperature, and whether you’re plugged in. Take before‑and‑after screenshots from the dash or app showing time, SOC, and estimated miles. Try to replicate with and without being plugged in, and with different Level 2 chargers if available. Save photos, videos, and any app notifications (such as “vehicle systems active”). If there was an over‑the‑air update, note the date and version.

Review your warranty booklet and battery coverage. Many EVs carry 8‑year/100,000‑mile or more coverage on the high‑voltage battery, sometimes with a capacity-retention clause; however, a defect causing abnormal overnight loss can still be a warranty issue even if the capacity threshold hasn’t been crossed. Open a case with the manufacturer and keep the case number and emails. If the problem persists after multiple visits or your car spends extended time in the shop, consider your options. Arbitration programs are sometimes offered, but they aren’t always the best fit for every situation—consider speaking with a lawyer first. For a no‑pressure, informational review, contact ZapLemon to discuss your documentation and next steps.