Buick joined the minivan market for 2005 with the Terraza, which features sliding side doors and a low step-in height. For 2006, the Terraza can be equipped with a new 3.9-liter V-6.

Two versions are offered: the base CX and uplevel CXL. Both models are available with either front- or all-wheel drive. A 3.5-liter V-6 is standard, but the new 3.9-liter V-6 can be installed in front-wheel-drive Terrazas. The Terraza's warranty has been lengthened for the 2006 model year.