GM Service Manual Online
For 1990-2009 cars only

A DTCs are read in only one of following two ways:

    â€¢ The IPC clearing DTC feature.
    â€¢ A scan tool

Most all information in diagnostic tables will refer to the scan tool for diagnostic support. For details on using the on-board diagnostic feature to access and/or clear DTCs Refer to On-Board Diagnostic System .