Make sure it's turned on!
From the map display:
Map Content [i+] icon @ bottom
Electric Range (2D)
-- > click to ensure an orange checkmark appears next to this icon
Then, as jadnasuanh indicated, make sure the map is in 3D mode from the display mode above the [i+] icon
Also, be sure the map is zoomed out sufficiently. If the car has a mostly charged battery, the range cloud won't appear if you're looking at the map from a "normal" level of zoom.