Being based on the same architecture as Chevy TrailBlazer and GMC Envoy, the 2004 Rainier brought some variety in the company's models line up. Offered in CXL and CXL Plus trims, the Rainier carried a powerful 4.2 liter 6 cylinder engine as well as a 5.3 liter V8 engine as an optional offering. The model was dropped after 2007 production year, because of recalls which occured every production year. What exact problems did the vehicle feature in its last year of production? The Rainier's power steering hose didn't meet the standars. While turning the steering completely left or right when applying brakes, it was prone to fractures what caused the fluid leakage.
While driving the models with hydro-boost power brakes, the additional braking effort was also required. The power steering fluid in its turn was more likely to be sprayed on hot engine components, causing fine in the components. With the presence of this problem, the dealers had to inspect the power steering hose and replace the component. As a result, it was detected that piping, hose, and other connections were affected on 123,592 untis. A big amount of recalls of Buick Rainier was one of the main reasons why the vehicle didn't gain any popularity.