US regulators probe Comma.ai after two fatal accidents tied to modified driver‑assist software

The National Highway Traffic Safety Administration announced on Friday that it is investigating Comma.ai’s OpenPilot driver‑assist platform after two separate crashes resulted in fatalities. According to TechCrunch, the probe focuses on incidents where the vehicles were operating with “forked” versions of the company’s open‑source software, suggesting that drivers may have installed unofficial modifications.

Both accidents involved vehicles equipped with Comma’s hands‑off technology, but preliminary data indicates the software running at the time differed from the official OpenPilot release. NHTSA investigators are reviewing telemetry, code changes, and driver behavior to determine whether the modified software contributed to the loss of control. The agency has not yet issued a recall or a safety directive, but it has warned owners to verify that their systems are running the latest, unaltered version.

Comma.ai, founded by former Tesla engineer George Hotz, markets OpenPilot as a low‑cost alternative to factory‑installed advanced driver‑assistance systems (ADAS). The software is open source, allowing hobbyists to customize features such as lane‑keeping thresholds and speed limits. While this flexibility has attracted a dedicated community, it also raises safety concerns when users deviate from the vetted codebase. Prior to this investigation, the company faced scrutiny after a 2024 incident in which an OpenPilot‑equipped car was involved in a non‑fatal collision, prompting NHTSA to issue a warning about driver attentiveness.

The current investigation is part of a broader regulatory push to ensure that aftermarket ADAS solutions meet the same safety standards as OEM systems. In recent years, the U.S. government has tightened oversight of autonomous‑driving technologies, requiring manufacturers to submit detailed safety cases and undergo rigorous testing before deployment. The outcome of the Comma.ai probe could set a precedent for how open‑source driver‑assist tools are regulated, potentially leading to mandatory certification or usage restrictions.

Industry analysts note that the case underscores the tension between innovation and safety in the rapidly evolving autonomous‑vehicle market. If the investigation finds that the forked software compromised vehicle control, it may prompt stricter enforcement of software integrity checks and could influence other developers to adopt more controlled distribution models. For now, Comma.ai has urged owners to update to the official OpenPilot release and has pledged full cooperation with NHTSA.