P1707-77 Transmission Fault

[TonyInIdaho]

2014 LR4 99k miles. Today I started my LR when i put it in reverse to back out of the garage I received a transmission fault on the info screen and a blinking R on the shifter. The rig would not move. I went from R to N and back nothing also to Park back to R nothing. Then I put the transmission in Drive I felt it engage and the fault went away. I went to reverse and all was well. When I reached my destination I used my GAP to read codes. I had a P1707-77 code as shown in photo. Everything had been working flawlessly and still seems to be. Some extra information, though likely unrelated. Lately the vehicle has been being used in extreme -20°f and colder conditions. But at night has been put away in a garage at about 45°f.

I can't find this particular code searching the threads.

Has anyone had any experience with this or any ideas?

 

[Rover Range]

For that DTC, work shop manual says replace the transmission control module. AKA valve body.

 

[Al Pizzica]

But that's a stock $$$$ Land Rover thing to do.

Have you ever changed your tranny fluid? Might be past time. Mine got wonky at 90 some k and a fluid change and a thing of Lube Guard mostly cleaned it up. I recently rebuilt the valve body with a zip kit and it is completely better.

 

[TonyInIdaho]

The previous owner had it done at the dealer about 30k ago. A fluid change is on my list for in the spring when things warm up. On another thread, a fellow shared a TSB that covers my vin for that CEL. It calls for use of a different pan. Sounds like it is a known problem in cold weather.