2008 Buick Enclave stability control problems

Snowy conditions - about 2 inches on the ground; as I began to descend the hill near my home I tried to apply the brakes to keep a slow pace down the hill. Brakes failed and I began to slide down the hill. Steering was unresponsive; messages interchangeably flashed on the dashboard - 'service stabilitrak' and 'service traction control'. I had no control over the vehicle, and halfway down the hill jumped an 8" curb. Fortunate that the vehicle swerved to the right because there were parked cars to the left.

While driving 60 MPH on the interstate in bumper to bumper traffic, my car went into limp mode. Rpms were high and I had to pull over from the fast lane with tractor-trailers driving around me after researching the issue, it seems this has been seen in alot of cars. This is a dangerous defect that needs to be resolved. I hope no one dies to make the manufacturer resolve this issue. The mechanic said this was a known issue with this vehicle. Recommended a transmission replacement.