Toyota T100 Problem Report
Toyota T100 P0770/P0773 fault code at higher mileage due to failed 3-way lock-up solenoid
A code P0770 or P0773 may occur at higher mileages which indicates that the 3-way lock-up solenoid could be defective and may need replacement.
After I reset the code p 0770, it will come back on cuising @ around 55 miles. The truck seems to run normal but I had trans fluid over heating a few time while towing a boat. - Visitor