When did Pontiac go out of business?

It didn't "go out of business" per se. It was discontinued by General Motors, who owned it. Production was gradually wound down throughout 2009. read more

Established in 1926 as a companion brand to General Motors’ Oakland, Pontiac quickly outgrew its companion to become the sister brand of Chevrolet. For most of its existence, Pontiac was marketed as the performance division of GM for many years, selling performance-oriented vehicles for the mainstream. read more

On April 27, 2009, GM announced that Pontiac would be dropped and that all of its remaining models would be phased out by the end of 2010. Though both production and franchise agreements ended in 2010, Pontiac remains a registered and active trademark of GM. read more