According to CarComplaints.com, transmission problems with certain Honda Odyssey minivans have led to a class-action lawsuit. The 9-speed ZF 9HP automatic transmissions used in the 2018-2019 Odyssey allegedly suffer from delayed shifting, loud noises while shifting, rough shifting, rough acceleration/deceleration, and sudden power loss.
The plaintiffs say the ZF 9-speed was used by Honda to improve gas mileage of the minivan, but the lawsuit alleges any improved fuel economy came at the expense of transmission problems.
Honda has issued multiple technical service bulletins (TSBs) to dealers concerning the ZF 9HP transmission problems, the lawsuit claims.
The plaintiffs also say that Honda created a customer service campaign to handle problems with the transmissions, but the minivans continue to experience problems with the 9HP.
So far, Honda has not extended the warranties or recalled the Odysseys despite these known issues.