Vehicle Identification (VID) Block
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Some powertrain control modules (PCM) may contain a memory area called a VID block. The VID block is used to store powertrain configuration information. The PCM VID block may contain the factory settings for the configurable modules unless the PCM has been flashed with a new calibration, in which case some PCM parameters may be modified.