GM says that some 2004-06 Saturn ION Redline models with 2.0-liter supercharged engines may produce a low or fluctuating idle after the engine is started, hot or cold.
If a scan tool doesn't turn up any trouble codes, and there are no other driveability or performance issues noted, the PCM will require reprogramming with updated software files to eliminate the idle complaints.
Check with a dealer for the specifics of the flash.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].