One problem related to transmission solenoid 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.
The transmission has suffered a failure of the solenoid and valve body. Apparently through speaking with some other owners of the same car, it is a known issue by gm as they have issued service bulletins in relation. This has occurred in cars as early as 30,000 miles. It causes the vehicle to shift hard and the transmission to fail as an end result.