SECTION VIIC SERVICE PROGRAMMING SYSTEM
2005 Tech 2 User’s Guide VII - 37
VCI Number
A Vehicle Configuration Index (VCI) is a number representing a valid combination of parts and systems
built in a vehicle, including optional equipment. GM Service and Parts Operations uses VCI numbers to
identify a unique calibration or group of calibrations.
You will need a VCI number to access vehicle calibrations when reprogramming if the VIN of the vehicle is
not part of the TIS data, depending on the vehicle, if it has been reconfigured from its original build
specifications. Keep in mind that many calibrations for reconfiguring vehicles (adding/changing options,
such as fog lamps) are selectable in TIS and a VCI number is not necessary.
If the VIN is not part of the TIS data that is currently loaded, a TIS error message will state that the VIN is
incorrect or a VCI number is needed. If this is the case, make sure that the appropriate software version is
loaded to your terminal.
To check which TIS version you are using, select the Help menu, then select TIS Main Help and click
About TIS. The current data version will be listed along with the blockpoint version for North American
Operations (Figure VIIC-1).
A VCI number also allows you to program a vehicle that has been reconfigured from its original
configuration. This includes changes in tire sizes and axle ratios. When selecting Reconfigure from the
“Supported Controllers” screen in TIS, the calibrations that support various configurations are presented
as information only. To access those calibrations, you’ll need a VCI number.
The VCI number provides access to all of the latest calibrations available for the vehicle based on its VIN.
A VCI number does not allow you to access calibrations that are designated “Not Selectable.” It is
important to ensure you have the correct VCI number to access the calibrations before reprogramming.
Figure VIIC-1
About TIS window shown in foreground of TIS Application Selection screen
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