GM Service Manual Online
For 1990-2009 cars only

DTCs are read in only one of following two ways:

    • The IPC display DTC feature.
    • 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 Diagnostics in Instrument Panel, Gauges and Console.