Vehicle was taken to an authorized Saturn dealer. My 2003 Saturn Ion had continuous high engine idle after being driven at highway speeds. If the vehicle was shut off, the power control module (PCM) computer reset itself. The Saturn dealer serviced the vehicle by re-programming the PCM (10/21/10 = $114) as per an issued service bulletin of 4/2004. This did not work.
Then they advised a spring in throttle body (engine) was bad and replaced the spring (10/28/10 = $200). This also did not work, engine still has high idle, and I brought the vehicle back on 11/2/10 to the service dealer. Service dealer then hooked up the car to their computer and had a service tech drive the vehicle for over 25 miles, 2 times, and then found another problem. They indicated that the power control module computer had a short, and caused a burned out component in the PCM computer. Since the Saturn is no longer being produced, the computer that must be replaced is on back order; and it's unknown when part will arrive. The Saturn service dealer advised that the vehicle should not be driven as it was a safety hazard, since the computer controls not only the engine, but the ABS braking system. At this time it's unknown when a part will arrive as it is on back order.
On searching the Internet, I found numerous complaints from persons who also had problems with the power control module computer. I believe that GM/Saturn has had full knowledge of the problem, and should have taken care of this problem prior; and as other owners of Saturns are having this serious problem, then GM should be making replacement parts for this computer more available to Saturn owners. The dealer has advised me that they do not know when the replacement computer will be available, as there is no part available in the entire USA. The part will have to be made by GM, and it's unknown when this will happen. So my 2003 Saturn Ion must be left at the dealer until a replacement computer is sent by GM, so my car can be repaired.
IF ANY ONE HAS A SOLUTION < EMAIL TO > firstname.lastname@example.org