I have a 2009 Chevy Impala 6cyl. When going downhill, my cruise does not control the speed even on a light to medium grade. Every other car I have ever had did and this includes my wife’s 2005 Malibu Maxx (also a 6 cyl). Hers holds the speed to the accurate setting even on a relatively steep downgrade.
I took it to the dealer and naturally they said there is nothing wrong. Big surprise (obviously, I don’t trust dealers).
What I have read on line varies. Some say it’s normal, others say it’s not right.
Is this behavior normal for my car, or not?