GM Service Manual Online
For 1990-2009 cars only

DTCs can be cleared by using one of the following methods:

    â€¢ A scan tool
    â€¢ The on-board diagnostics
    â€¢  A module may clear a history DTC after 50 ignition cycles

Most of the diagnostic tables will refer to the scan tool for diagnostic support. For details on using the on-board diagnostics in order to display and/or clear DTCs, refer to Diagnostic Trouble Code (DTC) Clearing