Fail-safe Solenoid Valve
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The fail-safe solenoid valve fixes the transmission at the 3rd gear, 5th gear, or R and deactivates the lock-up control when A/T fluid temperature is low or during fail-safe.