I encountered this problem with the 2014 Cruze Diesel (109K miles) automatic.
Going down a hill, braking to reduce speed, the rpm suddenly went up to 2000 and the car would not slow down until I re-applied brakes. Happened twice one after another—no issue with accelerating from a complete stop.
If it's an engine or powertrain I have a 3-month warranty and should get it taken care of.
Also a consistent rattle in the steering wheel and floor board (the tire shop did wheel alignment and balance, so can't be wheels related anymore). Could this also be a transmission issue?
Original transmission at 109K.