A Technical Service Bulletin has been issued for the 2016 Chevrolet Volt.
The Volt, which lacks a spare tire (like the majority of cars sold today), is supposed to be equipped with a tire inflator kit (sealant, compressor, etc). The kit is located under the rear cargo floor.
As it turns out, some Volts shipped without this kit, which means owners of those Volts have neither a spare, nor an inflator kit.
Chevrolet caught the problem some time ago and is now asking 2016 Volt owners to check their cars to see if there's an inflator kit. If there's no kit, then you local Chevy dealer will provide you with one free of charge. Cite customer satisfaction TSB #26900 when you talk to your service advisor at the dealership.
This thread over at GM-Volt.com shows several reports of 2016 Volt owners without inflator kits.
Source: Consumer Reports