Originally Posted by riversideC4

2002 C4 with automatic trans w/ tiptronic, 51,000 mi. On board computer indicates the wheels are out of sync. On normal take off, the transmission up shifts too soon. The car makes a droning sound similar to " lugging"? At that point, I used the tiptronic to shift manually.
The car shifts fine with with tiptronic. Trans fluid level is ok. Before I go to the dealer, any thoughts What would cause this?