GM to put electric Cadillac Converj into production General Motors Co. has decided to produce the Cadillac Converj, an extended-range electric car using the same technology as the Chevrolet Volt, The Detroit News has learned. Cadillac included the Converj, a concept car that wowed industry critics and the public at the 2009 North American International Auto Show, in a presentation made to the automaker's board of directors Nov. 2, according to sources familiar with the production