Tank Label Inspection
WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Verify that the CNG fuel tank label is in place. Contact the GM Technical Assistance Center if the label is not readable, peeling or missing. Verify that the tank expiration date on the tank and the underhood label matches. If needed, replace the underhood label so the expiration date matches the tank label.