As Buick's first minivan for the North American market, it was a badge-engineered variant of the Chevrolet, Pontiac, and Saturn minivans sharing the U platform (Uplander, Montana SV6, and Relay respectively), all manufactured in Doraville, Georgia.

The Terraza retailed at US$28,110 in 2005 (equivalent to $43,853 in 2023),[1] and debuted with one engine, a 3.5 L High Value V6 generating 200 hp (149 kW) and 220 lb·ft (298 N·m) of torque.

For 2006, a 3.9 L LZ9 V6, with 240 hp (179 kW) and 240 lb·ft (332 Nm) torque became available; the 3.5 L engine was discontinued a year later.

The Terraza offered leather seats and faux wood trim on the steering wheel, instrument panel, and gear shift knob.

The 2007 Terraza equipped with side airbags scored a "good" in the frontal offset and an "acceptable" in the side impact Insurance Institute for Highway Safety (IIHS) crash tests.