Lawyer I Trust Guide · General U.S. information · Reviewed September 16, 2026
When you purchase a vehicle, you expect it to perform reliably and safely. However, manufacturing errors, design flaws, or material failures can sometimes result in a motor vehicle defect. Understanding how these defects are identified, reported, and remedied is an essential part of being an informed vehicle owner.
Defining Motor Vehicle Defects
Under federal law, a “defect” is broadly defined to include any issue related to the performance, construction, a component, or the material of a motor vehicle or its equipment. This definition covers both original equipment installed by the manufacturer and replacement parts, such as tires.
A defect does not necessarily mean every single vehicle of a specific model will fail. Rather, it refers to a systemic issue that may pose a risk to motor vehicle safety. When a manufacturer or the National Highway Traffic Safety Administration (NHTSA) determines that a vehicle or piece of equipment contains a safety-related defect or fails to comply with federal motor vehicle safety standards, the process for addressing that issue is triggered.
The Role of Manufacturers and Regulators
Manufacturers have a legal obligation to monitor the safety of their products. If a manufacturer determines that a vehicle or item of equipment contains a safety-related defect or does not comply with safety standards, they are required to furnish a report to the NHTSA. This report must include detailed information about the defect, the population of vehicles affected, and how the manufacturer intends to address the issue.
The NHTSA also plays an active role in oversight. Through testing, investigation, and research, the Secretary of Transportation may identify potential safety risks. If the government determines that a defect exists, it may order the manufacturer to notify owners, purchasers, and dealers. This notification process is designed to ensure that those who own or operate the affected vehicles are made aware of the risk and the steps they can take to resolve it.
Remedies for Defects
When a safety-related defect is identified, the manufacturer is generally required to provide a remedy. Under federal law, the manufacturer has the discretion to choose the method of correction, provided it effectively addresses the safety risk. Common remedies include:
* **Repairing the defect:** The manufacturer may provide a fix for the faulty component or system.
* **Replacing the equipment:** If a part is defective, it may be replaced with an identical or reasonably equivalent component.
* **Refunding the purchase price:** In certain circumstances, particularly if a repair or replacement is not feasible, the manufacturer may be required to refund the purchase price of the equipment, subject to specific regulatory conditions.
If a remedy is not immediately available, the manufacturer may provide instructions on how to temporarily alter the vehicle to eliminate the safety risk until a permanent fix can be performed. It is important for owners to follow these instructions closely to maintain their safety while waiting for a formal repair.
Restrictions on Sale and Lease
To protect the public, federal law imposes strict prohibitions on the sale or lease of vehicles or equipment known to be defective. Once a defect or noncompliance has been identified and a notification is required, no person may sell or lease that equipment—or a vehicle containing that equipment—unless the defect has been remedied. This ensures that defective products are not introduced into the stream of commerce and that consumers are not unknowingly purchasing vehicles that pose a safety risk.
Sources and further reading
- 49 U.S. Code § 30102 – Definitions
- 49 U.S. Code § 30118 – Notification of defects and noncompliance
- 49 U.S. Code § 30120 – Remedies for defects and noncompliance
- 49 CFR § 573.6 – Defect and noncompliance information report
Educational information only. This guide is not legal advice. Laws and procedures vary by jurisdiction.