GM also said today that Chevrolet is expanding its optional bi-fuel engines, which can run on compressed natural gas or gasoline, to all cab styles of the 2015 Silverado 2500HD and 3500HD pickups.
A separate CNG fuel tank enables the driver to switch between fuels at the flip of a switch. When the CNG tank is depleted, the system automatically switches to gasoline.
GM said the 2500HD double cab and crew cab models with compressed natural gas are on sale now, and 2500HD regular cab and all 3500HD models will reach U.S. showrooms in July.
The City Express will offer 122.7 cubic feet of cargo space and an estimated payload capacity of 1,500 pounds, GM said.
Nissan, which introduced the NV200 in the U.S. last year, reported full-year sales of 4,619 of the vans. Ford sold 39,703 Transit Connects in 2013, up 13 percent from a year earlier.
The cargo-van supply arrangement is a first in North America for GM and Nissan, which builds the NV200 in Mexico. While GM has worked with Nissan alliance partner Renault SA in Europe, and the U.S. and Japanese companies make a van in Europe, they've not previously had a similar project for the U.S. and Canada, Nissan said in May.