Lemon Law Used Car for EV Onboard Charger Faults

If your used electric vehicle refuses to charge at home, starts and stops charging on its own, or constantly throws “charging system” warnings, the onboard charger may be to blame. In California, persistent onboard charger faults can interfere with everyday use of an EV and may qualify under the state’s lemon law if the problem can’t be fixed within a reasonable number of attempts while the car is under warranty. Below, we explain how California’s lemon law can apply to used EVs with onboard charger issues and what steps to take to protect your rights.

California Used EV Onboard Charger Lemon Law

The onboard charger (often called the OBC) is the component that converts AC power from Level 1 or Level 2 charging into DC power your battery can store. When it fails or malfunctions, you might see slow charging, frequent interruptions, “charge port open” or “charging fault” messages, or a car that only fast-charges at DC stations but won’t charge at home. These problems affect more than convenience—unreliable charging can strand drivers, increase costs, and reduce a vehicle’s value.

California’s Song-Beverly Consumer Warranty Act (often called the “lemon law”) can apply to used vehicles if they are covered by a remaining manufacturer warranty, a Certified Pre-Owned warranty, or certain dealer warranties. If the manufacturer or its authorized dealer can’t repair a defect covered by warranty after a reasonable number of attempts, the law may provide remedies. California also has a legal “presumption” that may help consumers when, within the first 18 months or 18,000 miles, there are multiple repair attempts for the same issue or the vehicle is out of service for 30 or more cumulative days. Even if your vehicle falls outside the presumption, you may still have rights—every situation is fact-specific.

If onboard charger faults continue despite repeat repairs—such as multiple OBC replacements, recurring charge port module errors, or ongoing software updates that don’t stick—you may be eligible for remedies like repurchase, replacement, or a negotiated settlement, depending on the facts and warranties at issue. Possible reimbursements can include qualifying incidental costs like towing or rental vehicles tied to the defect. Processes such as arbitration may be available, but they are not always required. Because lemon law outcomes depend on the specific repair history, mileage, and warranty coverage, a consultation can help you understand potential options.

What Records to Keep and When to Contact ZapLemon

Good documentation is the backbone of a lemon law evaluation. Save every repair order and invoice, even for “no problem found” visits. Make sure each repair record shows the date, mileage, your complaint in your own words (e.g., “charging stops at 5%,” “won’t accept Level 2”), the technician’s findings, and the parts or software updates performed (for example, onboard charger, charge port controller, harness, or firmware versions). Keep screenshots or photos of dashboard warnings and charging app error messages.

Track when the vehicle is out of service. A simple calendar or note on your phone showing drop-off and pick-up dates helps confirm downtime. Save receipts for towing, rideshares, or rental cars related to the charging problem. If the issue seems intermittent, keep a brief charging log: where you charged (home Level 1/2), time of day, state of charge, what went wrong, and any error codes. Also hold on to your warranty booklet and any manufacturer notices or technical service bulletins you receive.

Consider contacting ZapLemon if you’ve had repeated repairs for charging faults, the dealer says the vehicle is “operating as designed” but the problem continues, your EV has been in the shop for extended periods, or you’re being told to keep waiting for an update without a reliable fix. You don’t have to wait for a specific number of attempts to ask questions—a consultation can help you understand your rights early, including timelines that may apply. ZapLemon can review your documents, discuss common onboard charger patterns across various makes and models, and explain next steps so you can make an informed decision.