My transmission wont shift out of second when the engine/transmission hasnt warmed up. It wont shift until exactly 35mph (even if I take my foot of the gas). Once my engine/transmission has had time to warm up, the transmission starts to shift normally. This is the same with ECT Power and ECT Normal.
Ive also noticed that when I press down on the accelerator, power is not diverted to the wheels immediately.
My guess is low transmission fluid but I had the dealer check it out not to long ago when I took it in for its 90K maintenance.
I dont want to take it to the dealer again just yet and was hoping someone could shed some light.