One problem related to automatic transmission control module has been reported for the 2000 Volkswagen Passat. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Volkswagen Passat based on all problems reported for the 2000 Passat.
1) rain water entered the vehicle , 2000 Passat, 6cylinder, auto matic transmission and pooled approximately 2-3 inches) in the rear passenger side of the vehicle. Source of leak was unknown. All windows and doors were closed. 2) this led to the transmission control unit, which is housed under the passenger side, to become wet and malfunction. The transmission then began shifting up, and down erratically, while driving. 3) the dealership claimed this was not covered under the transmission warranty. The transmission control unit had to be replaced at a cost of $1351 dollars for the part and $250 for labor. Research on the web indicates that this is a common problem with vw's and is likely due to a design flaw which causes water to drain into the interior of the vehicle when certain drain holes become clogged.