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So i have been working with the service department at the dealership where i bought my car. The HSA was new for 2013 and initially they had almost no information on how the system is supposed work. Since then, they have been in repeated contact with GM and they have been testing new cars on the lot as they rotate through. I get the impression that GM is less than helpful and at this time there is no way to totally disable the system. One thing they found with the testing was that there was there was quite a bit of variance from car to car in terms of what incline was required to activate the HSA. The only thing they can do is recalibrate the 0 incline. Based on this ,i suggested that we raise the front of the car a couple of degrees when we do the calibration. If this works, then at least the HSA won't come on uless you are on a really steep hill. I am going down the the dealership this Saturday to test this and will report back
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