DTC P2610-29: ECM/PCM Engine Off Timer Performance Signal Invalid; DTC P2610-93: ECM/PCM Engine Off Timer Performance No Operation [12/2023 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
The soak timer operates after the ignition switch is turned off. When a certain amount of time has elapsed since the ignition switch was turned off, the soak timer activates the ECM to perform malfunction checks which can only be performed after the ignition switch is turned off. The soak timer is built into the ECM.