2003 Pontiac Grand Prix IAC Valve Location & cleaning

May I ask, what makes you think, the iac is the problem? A code won't tell you the problem, just the general area, supposedly.

The iac should be located on the throttle body, four wire connector. As far as cleaning, I don't think your supposed to do anything except wipe off the pintle. When you reinstall the valve, the pintle should not stick out more than 1 1/8 inch from the base, a little less is better. You can usually work it in with thumb pressure.

If that is the problem, you may need to clean the iac passages in the throttle-body, so, you may need to remove the throttle-body.