High Fluid Level
WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Fluid levels above the safe range may result in transmission failure. An overfill condition of transmission fluid may cause shift or engagement concerns and possible damage. High fluid levels can be caused by an overheating condition. A fluid level that is too high may cause the fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of fluid from the vent tube and possible transmission malfunction and/or damage. If an overfill reading is indicated, drain and refill the transmission.