Symptoms - Engine Exhaust: Intermittent
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.