TURNED STEERING WHEEL LEFT TO EXIT A FUELING PUMP AND THE POWER STEERING WENT OUT. THE PANEL DISPLAY INDICATED "POWER STEERING" AND AN INDICATOR ON THE DASH HAD A AMBER COLOR ICON WITH A WRENCH. HAD TO USE A LOT OF FORCE TO TURN VEHICLE TO A SAFE PLACE AND TURNED THE CAR OFF. GOT OUT AND LOOKED UNDER THE HOOD BUT COULD NOT DISCERN ANY OBVIOUS PROBLEM. TURNED THE CAR BACK ON AND THE PROBLEM DID NOT REAPPEAR AS DRIVING HOME APPROX. 2 MILES FROM SERVICE STATION. CONCERNED BECAUSE OF THE COMMENTS SEEN ON THE INTERNET REGARDING OWNERS HAVING SIMILAR EXPERIENCES WITH THESE VEHICLES. FORTUNATELY, MY SPEED WAS MINIMAL. IT WOULD BE VIRTUALLY IMPOSSIBLE TO CONTROL THE VEHICLE IF THIS HAPPENED AT HIGH SPEED ON A HIGHWAY. GM NEEDS TO RECALL. *TR