2001 QX4 P0744 Code no symptoms?

[2001qx4guy]

I have a 2001 -4wheel drive QX4 with 150k. Last transmission fluid drain and fill 50k ago.
Threw a P0744 code which looks like an overdrive transmission issue. SUV drives fine and appears to have no symptoms. I erased the code but it came right back and have no other codes.

Im getting about 3200 rpms at 60 miles an hour and wondering if anyone can tell me if this is a normal rpm when in overdive. My tires are P245 65R 17.

I plan on changing transmission fluid/filter and considering installing a new TCC solenoid valve. Is this the same solenoid as the " shift solenoid" ? Seems like the time to change it would be while the pan is off but dont want to buy a new one if its not needed or have to remove the pan again.
Any suggestions or comments on my plan?

Thanks for helping if you can.
Tom

[MisterH]

I would definitely take those steps. BTW, are you sure your overdrive is working? I turn about 2400 at 60mph. Try switching off O/D and see what your revs are at 60mph.

[2001qx4guy]

Thanks for the reply. Just checked rpms with overdrive "off" and rpms are the same at 60 mph -3200. Looks like overdrive isnt working so I will be ordering and installing new solenoid when I change the fluid.

Thanks