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Owners beware!!!! Pay attention to engine lugging and transmission not downshifting properly when you start up a grade or hill. This will happen @ low speeds & hi-way. Having a 9 speed transmission, I should not even feel this unit shift. Oh silly me, that's just it , it doesn't!!!! Have had this issue since new.
Been to the dealership 3 times & no fix. The last time, the car was there for 4 1/2 weeks!! GMC was involved receiving "all sorts of data". They claim there is nothing wrong & that is how this unit should act. I say that's crap.
Let these brilliant engineers fix what's already been installed in vehicles before conjuring up newer & more complicated garbage!! Better yet, take out all these sensors & computers & place them !!!!
 
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