One problem related to manifold/header/muffler/tail pipe has been reported for the 2014 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 Chevrolet Impala based on all problems reported for the 2014 Impala.
I was driving in highway traffic when the car's engine power shut off, couldn't restart for several attempts. Called 911 as a disabled vehicle in center of highway. Stabilitytrak and reduced engine power warning came on as well as check engine light. Brought to dealer, was told manifold bolts were loose and battery needed replacement. Paid dealer $663. The very next morning same thing happened again 3 times before I got to the dealer. After researching I see this is a common problem that gm is not addressing. This is a dangerous situation when engine shuts down on the middle of 4 lane highway! is someone going to have to be killed before gm recalls throttle body/ accelerator problem?.