Certain 2011 Express vans converted by Impco Automotive to run on compressed natural gas may have a pressure relief vent pipe which may not have been built correctly. If venting of the natural gas were to occur, this gas could end up in the passenger compartment, increasing the risk of an explosion or fire. Impco Automotive, in cooperation with General Motors will inspect the pressure relief device and vent pipe assembly and repair them as necessary.
 
Recalls
Recalls are issued for cars with safety-related defects or problems
2011 Chevrolet Express 3500
Compressed Natural Gas May Leak into Vehicle
Drive Train, March 8, 2013