transmission at low speed in, out, of overdrive Vehicle will shift smooth when new, and on test drive, but module self adjusts itself to traffic pattern. If you drive in city traffic 35 to 45 mph you will develop the problem of rough overdrive automatic shifting, and will end up manually shifting to eliminate rough in and out shift of overdrive. Its a very annoying feature "with no cure according to tech. at Nissan" thats a quote. Other than that no faults have been found