But today, following recent comments from the Japanese firm's chairman Osamu Suzuki that the two companies "aren't even talking", the Volkswagen Group decided to make these problems public with an official announcement.
"Volkswagen takes the view that this contradicts the terms of the cooperation agreement. Suzuki has now been given a period of several weeks to remedy the infringement," the German company said in a statement today.
"Volkswagen considers this step regrettable, but necessary, and has offered to discuss the matter with Suzuki. At the same time, the company stresses it still regards Suzuki as an attractive investment," VW added.
The German company also said that even though the cooperation is moving slower than expected, it has not yet reached a final decision.
"In its half-yearly financial report published in July 2011, Volkswagen noted that the partnership is developing more slowly than expected and announced a review. This review has not yet been finalized," VW stated.
Suzuki has not yet released a statement on the matter.
