Theory Of Operation
WARNING: This page is about a different variant/trim than selected.
The purpose of this diagnostic is to detect if the programmed Transmission Control Module (TCM) software matches the Hydraulic Identification Number stored in the Electronically Erasable Programmable Read Only Memory (EEPROM) of the TCM which indicates the type of hydraulic hardware is in the transmission. This Hydraulic Identification Number is stored during manufacturing of the Valve Body by the transmission supplier.