Need Transmission Wiring Harness and "Valve Body"

Mechanic is telling my truck needs the "Transmission Wiring Harness" and the "Valve Body". transmission if I don't need to.

For a little reference, I bought the truck from its original owner with 254K miles. It now has 259K. Aside from a little rust in the frame, the truck is in excellent overall condition.

2006 Toyota Tundra DoubleCab V8 SR5 4WD 5TBDT44106S534603

 

If it’s the A750, the wiring harness is known to corrode; why’d he say you need a new valve body?

 

Joseph, are you saying that the wiring itself may solve my problem?

 

Not necessarily, what problem are you having?

maybe if all your solenoids are going crazy it might just be a wiring issue; hard to say without seeing in person, or could be a single corroded wire

 

I have codes P0710, P0712 and P0986. Truck even went on Limp mode.

My mechanic also saw the damaged wires.

 

whats the year make a model?
2006 Tundra, V6 or V8, 4wd or 2wd?

 

2006 Toyota Tundra DoubleCab V8 SR5 4WD 5TBDT44106S534603

 

DTC P0710 Transmission Fluid Temperature Sensor "A" Circuit - either the wiring/connector/or sensor is bad
DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input - either the wiring/connector/or sensor is bad
DTC P0986 Shift Solenoid "E" Control Circuit High (Shift Solenoid Valve SR) - short in the wiring/shift solenoid is bad/ or ecm is bad

all three are strongly pointing to the wiring being the problem, and since we know the wiring corrodes on this tranny, thats a strong possibility. Why'd he want to replace the valve body too? (also you can ohm out the E shift solenoid to see if that is the problem if replacing the wiring harness doesn't fix it.)