Some pickup trucks, vans, and sport utility vehicles equipped with a hydraulic pump driveshaft that can fracture, resulting in immediate loss of hydraulic power steering assist. On certain vehicles equipped with hydro-boost power brakes, the same condition can result in loss of power assist for braking after the reserve pressure is depleted.

An inoperative pump can cause increased steering effort, and in hydro-boost equipped vehicles also increased braking effort, but does not completely eliminate the ability to steer or slow the vehicle.

Dealers will replace the hydraulic pump. The campaign is expected to begin during February 2005. Owners should contact GMC at 1-866-996-9463.

Certain trucks and sport utility vehicles were built with fuel module reservoir assemblies that contain fuel pump wires connectors may overheat under certain operating conditions.

If the ignition circuit wire is exposed, the fuel pump fuse will blow, disabling the fuel pump and causing an engine stall or no-start condition. If sufficient heat is conducted to the pass-through connector, a hole in the connector may result, which may cause a "Service Engine Soon" light to be illuminated during the emission system diagnostic routine. Fuel vapor and in some cases liquid fuel may leak out of the fuel tank through the hole in the connector body. If the ignition circuit or ground wire is exposed and shorts to the fuel level sender card wires, inaccurate fuel level readings may result.

Dealers will remove the fuel tank, and remove the module reservoir assemblies from the tank, and install a new service kit. The recall is expected to begin on May 31, 2005. GMC at 1-866-996-9463.