Fiat 500 2015 Owner's Manual page 344

342 WHAT TO DO IN EMERGENCIES
Shift Lever Override Access Hole
4. Push and maintain firm pressure on the brake pedal.
5. Insert a small screwdriver or similar tool into the
access hole, and push and hold the override release
lever in.
6. Move the shift lever to the NEUTRAL position.
7. The vehicle may then be started in NEUTRAL.
8. Reinstall the shift lever override access cover.