No — defects that substantially impair use or value also qualify, even if not safety-related. Safety defects reach the Tanner threshold faster (2 attempts vs. 4).
A widespread misconception about California lemon law is that a defect must affect vehicle safety to qualify. In reality, California’s Song-Beverly Consumer Warranty Act uses three alternative grounds: a defect that substantially impairs the vehicle’s use, value, or safety. You only need to meet one of these three — safety is not required.
Cal. Civ. Code § 1793.2(d) uses the phrase “substantially impairs the use, value, or safety of the new motor vehicle.” The word “or” is critical — these are three independent and alternative grounds. You can have a strong lemon law claim based purely on impaired value or impaired use even if the defect poses no direct safety risk.
A defect impairs use when it prevents the vehicle from being operated normally or reliably for the purposes for which it was purchased. An infotainment system that constantly freezes and reboots, a transmission that shifts roughly on every acceleration, an air conditioning system that does not cool in California summer heat, or a convertible top that will not operate — none of these are necessarily safety hazards, but all of them substantially impair the use of the vehicle. If the defect significantly degrades the driving experience or limits the car’s function in a meaningful way, it may satisfy the impaired use standard.
A defect impairs value when a reasonable buyer would pay substantially less for the vehicle knowing about the defect. This is a powerful standard because it focuses on market reality rather than physical risk. A car with a persistent documented defect — even if it can still be driven — is worth less than an identical defect-free car. If the defect appears in a Carfax report, has been subject to repeated warranty repairs, or is widely known in consumer complaint forums as a model-wide problem, a reasonable buyer would discount the vehicle’s price. That discount is the measure of impaired value.
Safety defects trigger the most immediate lemon law protections. Under the Tanner Act, a safety defect that could cause death or serious bodily injury only requires two failed repair attempts to trigger the presumption — not four. Brake failures, unintended acceleration, steering loss, stalling at highway speeds, airbag malfunctions, and similar defects fall into this category. If your defect is a safety issue, your timeline for legal action is shorter and your presumption is easier to establish.
Many successful lemon law claims involve defects that are not safety hazards but substantially impair use or value:
Understanding that safety is not required means you should not pre-screen your own claim by deciding your problem is “not serious enough.” Let an attorney make that evaluation. Defects that feel minor in isolation — an infotainment system that randomly reboots, for example — can be highly significant when documented across four or more repair attempts and paired with evidence of other consumer complaints about the same model. The cumulative picture often tells a story of a known defect the manufacturer is minimizing.