One problem related to automatic transmission floor shift has been reported for the 2004 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Impala based on all problems reported for the 2004 Impala.
I have rented several gm vehicles over the last year and found that in most every one of them it is possible to shift the car from park without applying the brake while the key is in the acc position.