my truck when I installed my Quadzilla I mis-plugged the ICP and thought it was plugged in when it wasn;t. Quadzilla box didn;t work and threw a check engine code, so I toke to a buds shop and hooked it up to the OTC Genisys and it showed ICP sensor which on my 04 is located behind the turbocharger. The truck ran and drove fine and it wasn't even plugged in. I am guessing the computer compensates to set values in the ECM coding when a failure like this occurs..............