GM Service Manual Online
For 1990-2009 cars only

The diagnostic trouble code (DTC) list below displays all DTCs found in this section. The DTC descriptions are listed in numeric order and indicate the DTC types for domestic and export vehicle applications. The DTC type is based on the action that the TCM takes when storing DTC information, and whether or not the TCM illuminates a service lamp or displays a message on a driver information center (DIC). The DTC descriptions in the Diagnostic Trouble Code List/Type below are listed in numeric order and indicate the DTC types for domestic and export vehicle applications. Each DTC is categorized into one of the following types:

Type A

This DTC is emissions related. The TCM stores the DTC in History, Freeze Frame and Failure Records during the first trip in which the conditions for setting the DTC are met. The TCM also illuminates the malfunction indicator lamp (MIL) during the first trip in which the conditions for setting the DTC are met.

Type B

This DTC is emissions related. The TCM stores the DTC in Failure Records during the first trip in which the conditions for setting the DTC are met. The TCM stores the DTC in History and Freeze Frame during the second consecutive trip in which the conditions for setting the DTC are met. The TCM also illuminates the MIL during the second consecutive trip in which the conditions for setting the DTC are met.

Type C

This DTC is non-emissions related. The TCM stores the DTC in History and Failure Records during the first trip in which the conditions for setting the DTC are met. The TCM does not store the DTC in Freeze Frame and does not illuminate the MIL. For some type C DTCs a separate service lamp, other than the MIL, may be illuminated.

The service information contained in this manual refers to the domestic, federal, calibration package. Domestic calibrations apply to vehicles sold in the United States, Canada and Japan. Export calibrations exist for both leaded and unleaded vehicles. DTC types may change for some export vehicles, and some DTCs may be turned off for leaded export vehicles. Differences between domestic and export calibrations are not reflected on DTC support information pages. DTC types for export calibrations are referenced only in the Diagnostic Trouble Code List/Type.