California Lemon Law for Faulty EV Onboard Chargers

If your electric vehicle refuses to charge at home or public Level 2 stations, the problem may be more than an inconvenience—it could be a defect in the car’s onboard charger. In California, recurring charging failures can fall under the state’s Lemon Law, which protects consumers when a manufacturer can’t fix warranty-covered defects after a reasonable number of attempts. Below, ZapLemon explains how the California Lemon Law can apply to faulty EV onboard chargers and what practical steps you can take to document your issue.

How California Lemon Law Applies to EV Onboard Chargers

California’s Lemon Law—formally the Song-Beverly Consumer Warranty Act—covers new vehicles and many used vehicles that are still under the manufacturer’s warranty. For EVs, that warranty typically includes charging components such as the onboard charger (the unit inside the car that converts AC power from a Level 1 or Level 2 source into DC power for the battery). If your EV’s onboard charger has a defect that the manufacturer or its authorized dealer cannot repair after a reasonable number of attempts, you may have rights under the law.

What’s a “reasonable number” depends on the facts, but California’s Lemon Law presumption often looks to the first 18 months or 18,000 miles (whichever comes first): four or more repair attempts for the same defect, two or more attempts for a defect likely to cause death or serious bodily injury, or the vehicle being out of service for repair for 30 or more cumulative days. You can still have a claim even if you fall outside those guidelines—the presumption is just one way to show a defect wasn’t fixed. Keep in mind that EV components like batteries and charging parts sometimes have longer warranty periods; lemon claims still focus on whether the issue was covered and not fixed.

A faulty onboard charger can substantially impair the vehicle’s use, value, or safety. If your EV won’t accept AC charging at home or at public Level 2 stations, you may be forced to rely on DC fast charging (if available), pay more for charging, or risk being stranded—impairments that can affect daily use and long-term value. Remedies under the law can include repurchase, replacement, or other relief, but outcomes depend on the specifics of your situation and the documented repair history. Deadlines and procedural steps matter, so consider a consultation to understand your options.

EV Onboard Charger Symptoms, Repairs, and Records

The onboard charger (OBC) is different from the wall “charger” or EVSE—your home unit or public Level 2 station simply supplies AC power; the car’s OBC does the conversion. Common OBC-related symptoms include: the vehicle won’t charge on Level 1 or Level 2 but still accepts DC fast charging; charging starts and stops intermittently; reduced AC charge rates; repeated “Charge Port Fault,” “Unable to Charge,” or “AC Charging Disabled” messages; tripped GFCI breakers; hot smells or clicking relays during plug-in; or errors tied to J1772 pilot/communication faults. If DC fast charging works while AC does not, that’s a classic clue pointing to the onboard charger rather than the EVSE or the outlet.

Repairs can involve software updates, replacing the onboard charger unit, high-voltage junction components, charge port hardware, wiring harnesses, or sensors. Dealers may also perform diagnostic steps such as verifying ground continuity, checking for Technical Service Bulletins (TSBs), and testing with multiple EVSEs. Because EVs blend software and hardware, a fix might require both a hardware swap and calibration or firmware updates. If a repair fails or the issue returns, ask the service department to record fault codes, freeze-frame data, and test results on the repair order; those details help show the defect and the attempts to fix it.

Strong records make strong lemon claims. Keep copies of every repair order, invoice, diagnostic report, and software update note. Document when, where, and how the charging failure occurs: photos or short videos of the error message, the station used, the outlet or breaker status, and your state-of-charge can be helpful. If the vehicle sits at the dealer, note each day out of service; keep towing, rental, and rideshare receipts, as some costs may be reimbursable under applicable law. If you can, test more than one Level 2 station to rule out a bad EVSE, and include those results in your log. Finally, review your warranty booklet and ask the dealer to check for TSBs and recalls—both can be important in showing a known issue and the manufacturer’s repair path.