Looking for a little help here boys. 06 LBZ with 115k. Throwing code P0877 transmission fluid pressure sensor/switch “D” circuit low. Trans is all stock besides a shift kit. I will occasionally get "range shift inhibited" on the dash and will stay in 3rd. I've cleared code/ restarted truck and gotten it to drive normally for a bit, but ultimately happens again. Fluid and both filters have 5k on them. I also have a Allison pressure switch assembly on order, but not 100% certain this will solve my issue. Any help is appreciated! Hopefully this is in the right spot