'05-'08 GXP Engine Control and Transmission Control Modules Location

The Engine Control Module (ECM) and Transmission Control Module (TCM) for the '05-'08 Pontiac Grand Prix GXP with LS4 5.3L V8 engine are located in the bottom half of the airbox. See pics.



http://i5.photobucket.com/albums/y186/lizzywiz/gxp_ecm_tcm_03.jpg
TCM left. ECM right




http://i5.photobucket.com/albums/y186/lizzywiz/gxp_ecm_tcm_01.jpg
TCM and ECM location in bottom of airbox