DTC P2756-14: Torque Converter Clutch Pressure Control Solenoid Control Circuit Short to Ground or Open [10/2017 - ]: Wiring Diagram
WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
Refer to DTC P2756-12.