Products Liability (Warranty)

Warranty-based products liability arises from contract law principles, primarily the Uniform Commercial Code (UCC), rather than from tort law. There are three main types of warranty claims. An express warranty (UCC section 2-313) is created by any affirmation of fact, promise, description, or sample made by the seller that becomes part of the basis of the bargain. An implied warranty of merchantability (UCC section 2-314) arises automatically in every sale by a merchant and requires that goods be fit for their ordinary purpose. An implied warranty of fitness for a particular purpose (UCC section 2-315) arises when the seller knows the buyer's particular purpose and the buyer relies on the seller's expertise to select a suitable product.

Warranty claims have distinct advantages and disadvantages compared to tort theories. On the advantage side, breach of warranty does not require proof of negligence or even a defect in the tort sense — only that the product did not conform to the warranty. This makes warranty theory useful when the product failed to perform as promised even if the design was reasonable. On the disadvantage side, warranty claims may be limited by the privity requirement (depending on the jurisdiction and UCC section 2-318 alternative adopted), by disclaimer clauses in the sales contract, by limitations of remedies, and by the requirement that the buyer give timely notice of the breach.

The interplay between warranty and tort claims is significant. Some jurisdictions allow the plaintiff to pursue both simultaneously, while others limit warranty claims to economic losses and reserve tort claims for personal injury. The Restatement (Third) of Torts: Products Liability largely sidesteps warranty theory, focusing on tort-based strict liability, but warranty remains a critical alternative theory especially for commercial transactions and cases involving purely economic harm.