DTC P2610: ECM/PCM Internal Engine Off Timer Performance: Description

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built into the ECM (included in the hybrid vehicle control ECU), measures 5 hours (+/-15 minutes) from when the power switch is turned off, before the monitor begins to run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5 hours have elapsed, the ECM turns on.