Storing the DTC P2610 OBD2 code indicates that a problem exists in the Engine Control Module (ECM) or Powertrain Control Module (PCM) to determine whether or not the engine has shut down, as well as how long it has shut down.
The vehicle’s computer uses input signals from the engine to determine whether or not the engine is running. To do this, it takes into account the information provided by the Crankshaft Position Sensor (CKP), Fuel Rail Pressure Sensor (FRP), and primary ignition system voltage. In case the ECM / PCM fails to find a signal from these or any other indicators, you may not be warned that the engine has shut down.
The internal engine shutdown timer is used to monitor ignition cycles which are necessary for the calculation of fuel delivery and injection timing. Besides, the timer monitors transmission shift patterns.