One problem related to transmission gear indicator has been reported for the 2008 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Chevrolet Impala based on all problems reported for the 2008 Impala.
When taking off the vehicle would jerk into gear after a slight sputter. You have to let the transmission get fully hot (running for 10-15 minutes even on a hot day) for it not to jerk when pulling off or let it slightly coast before giving gas to keep from jerking. Once it's good and hot I have not seen any other problems.