GM's minivan offering, the Chevrolet Traverse and Buick Enclave (though technically SUVs, they fill a similar niche to minivans), while generally well-regarded, haven't consistently received the top reliability marks of the Pacifica in recent years from these major sources.
Therefore, while a specific GM model year cannot be definitively declared the most dependable, it's important to consult specific year-by-year reliability reports from reputable sources (like those mentioned above) for the GM minivans/SUV alternatives *before* making a purchase decision. Check for common problems reported for each year as well.