2019 Hyundai Nexo

The 2019 Hyundai Nexo has 6 recalls, with five tied to hydrogen fuel system fire risks that can occur while the vehicle is parked, turned off, or being driven.

Four of the five fuel-related recalls involve hydrogen leaks that may go undetected or uncontained. The hydrogen leak detection sensors can degrade over time and fail to register an active leak, meaning the warning light on the dashboard never turns on and the driver has no indication of the danger. A separate but related issue involves sensors specifically monitoring the hydrogen gas delivery system, which can also fail to detect leaks in that circuit. On top of the sensor failures, a safety valve in the hydrogen fuel system can fail mechanically and allow hydrogen to escape on its own. There is also a concern with the fuel tank itself: a thermally activated pressure relief device on the tank can break and release hydrogen directly. Separately from those leak-related issues, a filter inside the hydrogen refueling inlet receptacle can detach after the vehicle is filled up, creating another path for hydrogen to escape near an ignition source. Because hydrogen is highly flammable, any of these conditions raises the risk of fire whether the car is in motion or sitting in a garage.

The remaining recall covers the integrated electronic brake control software, which can misread a sensor signal and sharply reduce braking force, requiring a longer distance to bring the vehicle to a stop.