Connected Vehicle Cyberattack Exposes Hidden Risks

A March 2026 cyberattack on Intoxalock, a major ignition-interlock provider, left hundreds of drivers across 46 U.S. states temporarily unable to start their vehicles. The attack disrupted backend servers that interlock devices rely on to verify compliance, upload breath-test logs, and confirm calibration — causing cars to default to a locked state even when drivers passed breath tests. The incident underscores a growing risk in connected vehicles: as more car functions depend on cloud services and subscription infrastructure, backend outages can simultaneously strand large numbers of users. Experts advocate for local fallback mechanisms — like Ford's PIN-based backup — to reduce dependence on continuous connectivity. The episode is framed as a preview of broader connected-vehicle risks, including robotaxi fleet failures and smartphone-key lockouts in areas with poor cellular coverage.