P0773 fault code at higher mileage due to failed 3-way lock-up solenoid on Toyota RAV4

Problem Description and Possible Solution
A code P0773 may occur at higher mileages which indicates that the 3-way lock-up solenoid could be defective and may need replacement.
Problem Data
RepairPal Verified
Average mileage: 151,500 (90,000–196,500)
Drive Trains affected: 2WD, 4WD
6 model years affected: 1996, 1997, 1998, 2000, more2001, 2006
11 people reported this problem
Viewing 1 - 4 of 4 comments
Same code, check the wiring and found brittle and cracked wires on harness, repaired wiring. Issued fixed light went away
Had a code reading of P0773 having slippage an in reverse its as if the transmission-transaxle is going to fall out. Ive been quoted from $1600 to$3000 to have it fixed and I am told that my transmission will need to be rebuilt. Problem still not fixed, I'm not even sure if it will be!!
Solenoid possibly, stalls when stopping, doesn't want to shift up to go faster than 35-45 mph.. Problem started two years ago, and grew until car is undrivable
Car turns on, then stalls out. Will not stay on. Stalls out. Toyota dealership said it was ECM computer, the brain. Can't get codes, computer out. Who knows? ECM replaced August 2013, less than two years ago. Now I need another computer???