The value of new software contract wasn't disclosed, though George Kadifa, executive vice president, HP Software, said "this is the largest deployment of our full product portfolio in the world, second to none, at this stage."

HP will also continue to provide some services to GM.

"There is a good chunk of employees that will stay with HP that will continue to provide services to General Motors," said Mike Nefkens, acting global HP enterprise services leader, during the conference call.

GM has for decades relied heavily on outsourcers to run its data centers and to write and manage its applications. A major part of this work was contracted to the former Electronic Data Systems, which was acquired by HP in 2008.

Mott, before taking the GM job, is doing for the automaker, in part, what he did at the computer firm.