You need to check your pressure sensors. And you say the fluid looks fine and there are no leaks?
If it shifts down to 1st with the handle it means that the "change gear now!" command to the computer to switch the right solenoid works fine.
The fact that it doen't do it automatically might be that the computer doesn't see the correct conditions to switch the gears. So it could be that the correct pressure is not detected and that might be a defective pressure sensor or sensors.
one of mine went at 98K miles.
Originally Posted by
cruzalekz
no codes, then your trans is worn out/tired time for retirement.
And you based this on what??