Trailer lights are more than convenience—they’re safety equipment. If your tow vehicle or trailer keeps losing brake lights, turn signals, or running lights, you may be wondering whether California’s Lemon Law can help. Below, we explain how recurring trailer light failures can fit under California’s Song-Beverly Consumer Warranty Act (often called the California Lemon Law), what counts as repair attempts, and practical steps you can take to protect your rights. This article is general information, not legal advice.
When Trailer Light Failures Trigger California Lemon Law
Trailer light problems can fall into two buckets: defects in the tow vehicle’s factory towing system, or defects in the trailer itself. When a fault lives in the vehicle you bought or leased—such as a defective body control module (BCM), trailer lighting control module, factory 7‑way/4‑pin connector, wiring harness, fuses, or software that detects and powers trailer lighting—and the issue persists under warranty despite dealer repairs, it may qualify under California’s Lemon Law. If the problem is in the trailer’s own wiring or lamps, coverage may come from the trailer’s warranty and the consumer-goods portions of Song‑Beverly rather than the vehicle-specific buyback provisions.
Because lighting is directly tied to safety and legal compliance, repeat failures can “substantially impair the use, value, or safety” of a vehicle used for towing. Think of issues like: the truck displays “Check trailer wiring,” blows the tow fuse, or intermittently kills the right brake/turn on any trailer you connect. If, within the first 18 months or 18,000 miles, the manufacturer (through an authorized dealer) gets at least two chances to fix a safety-related defect, or the vehicle is out of service 30+ cumulative days, California’s “Tanner presumption” may apply. You don’t need the presumption to win a Lemon Law claim, but it can make your case easier to prove.
Coverage can extend to new vehicles and many used vehicles still under the manufacturer’s warranty, including certified pre-owned. Small businesses with a limited number of vehicles may also have protections. For towable RVs and travel trailers, the chassis-related parts versus “living quarters” components can be treated differently under the law. Because these boundaries are technical and fact-specific, a tailored consultation is the best way to understand how your situation fits.
Repair Attempts, and Next Steps Under CA Law
Under California law, you generally must give the manufacturer a reasonable number of opportunities to repair the defect through an authorized dealer. As a rule of thumb, four or more repair visits for the same issue may be enough, two visits may suffice for a defect likely to cause serious injury or death, and 30 or more cumulative days in the shop can also qualify. “No problem found” visits, software updates, and temporary fixes still count—what matters is that you reported the same trailer-light defect and the dealer documented it.
Practical tips to strengthen your record include: describe the complaint the same way each time (“Trailer right brake/turn inoperative; ‘Check trailer wiring’ message; blows tow fuse”); bring different, known-good trailers or adapters to rule out accessories; take photos or short videos when the lights fail; request copies of every repair order and warranty printout; and ask the dealer to note any technical service bulletins (TSBs), software updates, or parts replaced (e.g., BCM, tow module, harness, connector, ground repair). If problems continue, contact the manufacturer’s customer care in writing and keep copies. Some warranties reference arbitration; learning those steps early can help you plan, though you don’t have to go it alone.
If the defect persists, potential remedies under Song‑Beverly may include repurchase or replacement of the vehicle, or other relief available under the consumer-goods provisions if the defective item is the trailer itself. Outcomes depend on facts like warranty status, repair history, and how the defect affects safety and use. The next smart step is a focused review of your timeline, mileage, repair orders, and days out of service. ZapLemon can help evaluate your situation and explain available options.
Attorney Advertising. This post is for informational purposes only and is not legal advice. Reading it does not create an attorney–client relationship, and past results do not guarantee a similar outcome. If you believe your vehicle or trailer has recurring lighting defects and may qualify under California law, contact ZapLemon for a consultation at (555) 555‑0199 or visit www.zaplemon.com. Keep your repair records handy—we’ll review them with you and discuss next steps.