One problem related to power steering pump has been reported for the 2003 Chevrolet Avalanche. The most recently reported issues are listed below.
Turning at low speeds power stearing pump stops working at low sped. No apperant probems w/ the pump no loose belt. Need to rev to 1500 rpm to get the power steering to work. Seams to work ok whenit is cold problem starts when vech. Is warmed up. Repair has not been made yet.