Hydrogen fuel
A team at GM did, however, continue to work on Autonomy, which was intended to be powered by a hydrogen fuel cell. They unveiled a non-drivable version of their modular vehicle in January 2002 at the Detroit Auto Show. GM unveiled a drivable prototype, called Hy-wire at the Paris Auto Show in September, 2002. The name referred to the Hydrogen fuel and the "drive-by-wire" system that electronically connected the vehicle modules for steering, braking and controlling the 4 wheel motors. Hy-wire did not go into production.