Scan Tool
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Scan tool is preferable way to clear DTC information. Freeze frame and failure record data will also be cleared. ECM adaptive learning and system monitors will only be cleared for those system which had a stored DTC.