my 2004 grand prix gtp has two error codes one is p0741 it says my bbtcc is stuck off; the explanation on the read out from autozone says bbtcc commanded on and the ecm detected the txx slipp bbspeed higher than limits probable cause bb1 txx solenoid failure bb2 open or short circuit condition bb3 clocked passage in transmission bb4 check transmission range switch for proper bboperation i have no idea what this means or how to tell which it is i also have an error code about my gas cap p0455 it says large evap leak detected it says probable causes are loose defective or missing fuel cap ... its there i have checked dont know how to se if its defective bb2 EVAP conister broke hose cracked or not connected bb3 purge or vent solenoid defective bb4 vacuum leak at enigine how do i tell and what is the evap? pleeaaase help!!!

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