Unintended acceleration is frightening, dangerous, and frustrating—especially when your vehicle keeps surging on its own despite repeated trips to the dealership. If this is happening to you in California, the Song-Beverly Consumer Warranty Act (commonly called the California Lemon Law) may offer protection. Below, ZapLemon explains how the law treats unintended acceleration and how to document the issue in a way that supports a potential lemon claim. This is general information to help you understand your rights, not legal advice.
What California Lemon Law Covers for Acceleration
California’s Lemon Law applies to new and used vehicles sold or leased in the state that are covered by the manufacturer’s warranty. The law requires manufacturers to repair defects that substantially impair the use, value, or safety of the vehicle. Unintended acceleration—such as sudden surges when braking, inconsistent throttle response, or “lurching” from a stop—often qualifies as a safety-related nonconformity when it persists despite repair attempts.
A “reasonable number of repair attempts” is key. California has a legal presumption that can help consumers when, within the first 18 months or 18,000 miles, the same defect has been repaired multiple times or the vehicle has been out of service for repairs for an extended period. For serious safety issues that could cause death or serious injury, fewer attempts may satisfy the presumption. Even if you’re outside those mileage or time windows, you may still have a claim—the presumption is just one way to make your case, not the only way.
Coverage typically extends to cars, SUVs, trucks, and EVs, as long as the defect appeared and was presented for repair under the warranty and wasn’t caused by misuse or unauthorized modifications. Potential remedies under the law can include a repurchase (buyback), a replacement vehicle, and reimbursement for certain incidental expenses like towing or rental cars. Outcomes depend on facts and documentation—there are no guarantees—and issues can involve software glitches, throttle body failures, pedal sensor faults, transmission and idle control problems, or floor mat interference.
Steps to Document Unintended Acceleration Issues
Start with safety. Do not try to recreate unintended acceleration. When an incident occurs, pull over safely and note the date, time, speed, mileage, road conditions, weather, and what you were doing (e.g., braking, using cruise control, shifting to park). If it’s safe, take photos or short videos showing dashboard warnings or RPM spikes. Maintain a simple log or notes app with each incident to capture patterns that may help a technician identify the root cause.
Each time you visit the dealer, clearly describe what happened using everyday terms—when it occurs, how often, and under what conditions. Ask that your exact complaint be written on the repair order, and request a copy when you drop off and pick up the vehicle. If the dealer says “unable to verify,” request a joint test drive with a technician, and ask that all findings be documented. Keep copies of every repair order, invoice (even if warranty-covered), tow receipt, and any emails or texts with the dealer or manufacturer. If the manufacturer opens a case, write down the case number and representative’s name.
Round out your file with supporting evidence. Check your VIN for recalls and technical service bulletins (TSBs); if any apply, ask the dealer to address them and give you proof. Consider submitting a complaint to NHTSA’s Office of Defects Investigation, which can help identify broader patterns. If your vehicle has an event data recorder or logs accessible to the dealer, ask that they be reviewed and referenced in the repair documentation. Avoid resetting systems or clearing codes before service, and let the dealer note any aftermarket parts that might be relevant. A tidy, chronological paper trail often makes the difference in evaluating a potential lemon claim.
This article is for informational purposes only, does not constitute legal advice, and reading it does not create an attorney–client relationship. Results vary based on individual facts, and no outcome is promised or guaranteed. If you believe your vehicle may qualify as a lemon due to unintended acceleration, contact ZapLemon for a consultation at zaplemon.com. We’re here to review your situation, explain your options, and help you take the next step.