Transmission Control Module (TCM) equipment

Example for a transmission:

Fig 1: Identifying Location Of Transmission Codes

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Code letters and transmission data (arrow 1 and 2)

FXA	Transmission code letters
30510 - TFA001	Manufacturers serial number
09G 300 035G	Transmission part number
AISIN AW	Manufacturing company: AISIN
On Board Diagnostic (OBD)	OBD II
DTC memory	Permanent memory * See note

* Independent of voltage supply.

Transmission code letters are also listed on the vehicle data plate.