Ok, here goes. I asked someone about this the other day, because I noticed it ever since I first drove the car.
The way it was explained to me is this is a technology referred to as engine braking. Basically, what happens is when you take your foot off the accelerator, the CVT sends a message to the engine via a sensor that there is no longer a load on the transmission. The engine sensor responds by retarding acceleration, automatically slowing the car down, most times before the brake is even applied.
Seems as though this is being used in other make/model vehicles as well. Sure am glad I know so many mechanics, because I am obviously not an electrician, which you almost have to be these days to service cars like the Compass.
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My 2007 Jeep Compass Sport, Bright Silver Metallic, 26E, CVT II, Driver Convenience Group, Sunroof, Trailer Tow Prep Group, 4x2
1991 XJ Cherokee Sport 4X4 4.0 H/O I6
2008 Dodge Ram 1500 ST, SWB Reg Cab, Bright Silver Metallic, Trailer Tow Package
JEEP - Just Enjoy Everything, Period.....