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ok, I looked under my hood and I see what you are talking about, no where for it to go on the hydroboost system? I wonder if it needs to be deleted from programming then, what I mean is to re program the bcm so it knows it has hydroboost now, did you get the hydroboost out of another gtm900? or was it a kit of some kind?
you should be able do it with a tech2 and acdelco tds (via computer usb serial adapter/tech2 passthru), but you will need to know the specific rpo codes you want to change. The tdsweb programming is $40 for 2yrs of programming (per vin number) once you create a account and pay the $40 you can program it as many times as you want
I would think as long as it shows having vacuum it would be fine, but gm does weird stuff my 18 Silverado has the active shutters in the Grill and apparently there a pia to circumvent
that sucks, where I live generally there are alternate routes to take when the freeway gets jammed up, just have to be smart about it because every tom dick and harry will take the 1st alternate route and jamm that up even worse, so if you take the 3rd alternate it's usually clear, lol
