A Republican-led effort to defund the federal vehicle kill switch mandate failed in the House, leaving the 2021 infrastructure law intact. The amendment, proposed by Rep. Thomas Massie, sought to block funding for Section 24220, which directs the Department of Transportation to develop impaired-driving prevention systems. The final vote was 268-164.

The law requires new vehicles to have technology that can prevent or limit operation if impairment is detected, but it leaves the technical design and privacy boundaries to regulators. Opponents like Massie and the Competitive Enterprise Institute warn this creates a precedent for government monitoring of driver behavior without clear limits on data collection or sharing.

Supporters, including Rep. Debbie Dingell and Mothers Against Drunk Driving, argue the technology can save lives by preventing drunk driving deaths. They maintain the law doesn't mandate GPS tracking or remote shutdowns. The decision now shifts to the National Highway Traffic Safety Administration, which must craft the specific regulations.