The federal car kill switch law is Section 24220 of the Infrastructure Investment and Jobs Act, signed in November 2021, which directs the National Highway Traffic Safety Administration to write a safety standard requiring “advanced drunk and impaired driving prevention technology” in all new passenger vehicles built after the standard takes effect.1GovTrack. HR 3684 (117th): Infrastructure Investment and Jobs Act The rule has not been issued. NHTSA missed its original November 2024 deadline, and no vehicle currently on a dealer lot is subject to the mandate.
What the Statute Actually Requires
Section 24220 defines the required technology two ways. It can passively monitor driver performance to identify impairment and then prevent or limit vehicle operation. Or it can passively detect whether a driver’s blood alcohol concentration meets or exceeds the legal limit (0.08 in most states) and prevent or limit operation above that threshold. A manufacturer can use either approach or combine them.1GovTrack. HR 3684 (117th): Infrastructure Investment and Jobs Act
The word “passively” matters. This is not the ignition interlock model where a driver blows into a tube. The system has to run in the background and stay invisible to a sober driver. Detection could come from sensors that read alcohol from cabin air or from skin contact at the steering wheel or start button, or from cameras and software that watch eye movement, gaze, and steering inputs for signs of impairment. Congress left the technical choice to manufacturers and NHTSA.
Congressional findings pointed to more than 10,000 alcohol-impaired crash deaths in 2019 and cited an Insurance Institute for Highway Safety estimate that the technology could prevent over 9,400 deaths annually.1GovTrack. HR 3684 (117th): Infrastructure Investment and Jobs Act
Which Vehicles Are Covered
The mandate reaches “passenger motor vehicles,” which federal law defines as motor vehicles designed to carry no more than 12 people. Motorcycles are explicitly excluded. Trucks not designed primarily to carry an operator or passengers are also outside the requirement, which leaves most commercial trucks and heavy work vehicles unaffected.2Cornell Law Institute. Definition: Passenger Motor Vehicle from 49 USC 32101(10)
Only new vehicles built after the eventual compliance date are covered. If you already own a car, you will not have to retrofit it. Used cars, classics, and anything manufactured before the standard takes effect fall outside the rule.1GovTrack. HR 3684 (117th): Infrastructure Investment and Jobs Act
When the Rule Takes Effect
The original statutory deadline was November 15, 2024, three years after enactment. That deadline passed without a proposed rule, let alone a final one. NHTSA published an Advance Notice of Proposed Rulemaking in January 2024 and received more than 18,000 public comments, which it is still evaluating.3National Highway Traffic Safety Administration. Advanced Impaired Driving Prevention Technology
The law has a built-in extension. If NHTSA determines it cannot write a standard that meets the Safety Act’s requirements for practicability and objective performance criteria, the agency can extend the deadline by up to three additional years, pushing the outside limit to November 2027. Until a final rule is issued, NHTSA has to file annual reports to Congress explaining the delay.4National Highway Traffic Safety Administration. Advanced Impaired Driving Prevention Technology Report to Congress
The technology is not ready either. The Driver Alcohol Detection System for Safety program, the main research partnership behind the mandate, expected its breath sensor to be ready for licensing to automakers by the end of 2025, with vehicle integration requiring another 18 to 24 months before commercial availability. Under optimistic projections, that puts the earliest equipped vehicles somewhere around 2027 or 2028.3National Highway Traffic Safety Administration. Advanced Impaired Driving Prevention Technology
NHTSA’s 2026 report to Congress said it is still working through “critical and complex topics including technology readiness, test procedure development, and consumer acceptance, as well as cybersecurity and privacy concerns.” The agency has not committed to a specific date for proposing or finalizing the rule.4National Highway Traffic Safety Administration. Advanced Impaired Driving Prevention Technology Report to Congress If NHTSA never issues a final rule, the annual reporting obligation expires ten years after enactment, in November 2031, at which point Congress would have to act again.
What the Law Does Not Do
Section 24220 says the system must “prevent or limit motor vehicle operation” when impairment is detected, but it does not describe how. It contains no requirement that the car pull to the shoulder, no “safe state” protocol, and no specified emergency override.1GovTrack. HR 3684 (117th): Infrastructure Investment and Jobs Act Those details are left to the eventual rule.
The statute itself also contains no provisions on data privacy, encryption, driver consent, or where sensor data may be stored or shared. NHTSA has acknowledged privacy and cybersecurity as issues it must resolve before proposing a rule, but until it does, any protection has to come from the rulemaking, from general consumer-protection law, or from state privacy statutes.4National Highway Traffic Safety Administration. Advanced Impaired Driving Prevention Technology Report to Congress The Federal Trade Commission’s 2025 enforcement action against General Motors, which involved sharing driver location and behavior data without consent, gives some idea of the kind of telemetry these systems will produce and the disputes it can trigger.
Penalties and Tampering
Once the standard takes effect, manufacturers that sell noncompliant vehicles face civil penalties of up to $21,000 per vehicle, with a related-series cap of $105 million.5Office of the Law Revision Counsel. 49 USC 30165 – Civil Penalties
Federal law separately prohibits manufacturers, dealers, rental companies, and repair shops from knowingly making a mandated safety device inoperative, with a narrow exception when the business reasonably believes the vehicle will not be used while the device is disabled.6Office of the Law Revision Counsel. 49 USC 30122 – Making Safety Devices and Elements Inoperative The statute lists businesses, not private citizens. An individual owner who disables the system on their own car does not violate this particular provision, but a shop or mechanic that does it for them faces civil penalties of up to $21,000 per violation.5Office of the Law Revision Counsel. 49 USC 30165 – Civil Penalties
Any final standard NHTSA writes has to be “practicable” and “reasonable” for the vehicle type under 49 USC 30111, which gives manufacturers a legal basis to challenge a rule that outruns the available technology.7Office of the Law Revision Counsel. 49 USC 30111 – General Requirements
Other Kill Switches People Confuse With This Law
Two other technologies get called “kill switches” and are often what people are actually asking about. Neither has anything to do with Section 24220.
Lender-Installed Starter Interrupt Devices
Subprime auto lenders often install devices that let them remotely prevent a financed car from starting if the borrower falls behind on payments. The Consumer Financial Protection Bureau describes these as “payment assurance” tools typically installed on used vehicles sold to subprime borrowers, either at the point of sale or after a repossession reinstatement, and directs examiners to check whether servicers use the devices in line with their disclosures.8Consumer Financial Protection Bureau. Automobile Finance Examination Procedures
There is no single federal statute on these devices. Regulation is at the state level and varies. Common protections found across state laws include:
- A minimum delinquency period before activation, often 30 days.
- Advance notice before disabling the vehicle, commonly 48 hours.
- A limited number of emergency override codes, often two per year.
- Written disclosure at the time of sale explaining that the device will be installed and how it works.
- Restrictions barring activation where it could cause injury or endanger public safety.
Colorado prohibits a secured party from disabling an embedded device “if immediate injury to any person or property is a reasonably foreseeable consequence.” Connecticut requires 15 days’ notice before activation and requires the borrower to separately agree to the self-help provision in the security agreement. In states without a specific statute, the general commercial-code right to render collateral unusable without judicial process applies, so long as the lender avoids a “breach of the peace.”
Court-Ordered Ignition Interlocks
The oldest form of vehicle kill switch is the ignition interlock, ordered after a DUI conviction, which requires the driver to blow a passing breath sample before the engine will start and often demands rolling retests while driving. Thirty-one states and the District of Columbia require interlocks for all convicted drunk drivers, including first-time offenders. Eight more states mandate them for high-BAC or repeat offenders, and six leave the decision to a judge.9National Conference of State Legislatures. State Ignition Interlock Laws Courts typically limit interlock-equipped driving to essential purposes such as commuting, treatment, and monthly service visits. The offender pays for installation, rental, and monitoring.
Section 24220 grew partly from the interlock model’s limits. Interlocks reach people already convicted of DUI and do nothing to prevent a first offense. The federal impaired-driving mandate is meant to build passive detection into every new car and reach a much broader population, if and when NHTSA writes the rule to do it.