G4 Canada was originally launched on September 7, 2001 as the Canadian version of TechTV.
On May 28, 2004, TechTV Canada was renamed G4TechTV Canada after the U.S. G4 and TechTV channels merged.
In June 2009, G4TechTV was renamed G4.
Although the American version of G4 ended its operations on December 31, 2014, the Canadian version was still airing until August 31, 2017, after Rogers quietly announced the previous month that they would be shutting down G4 due to "the current competitive television landscape" and a desire to focus on Rogers' "core specialty portfolio".
By coincidence, G4 Canada outlasted both its American counterpart and it's intended replacement, the Esquire Network, which ended all operations on June 27, 2017.