Theory Of Operation

The hood ajar status is monitored using two switches for the Engine Stop/Start (ESS) equipped vehicles. Hood Ajar Switch 2 is integrated into the Left Hood Latch and is hard wired to the Body Control Module (BCM). The signal is sent to the Powertrain Control Module (PCM) over the CAN BUS. Hood Ajar Switch 1 is integrated into the Right Hood Latch and is hard wired to the PCM. If the PCM detects that either switch is in the open position or is faulted for any reason, the ESS feature will be disabled during the current ignition cycle.

For further information on the effect of this DTC to the operation of ESS, see ENGINE START/STOP (ESS) INOPERATIVE.  . Refer to ENGINE STOP/START (ESS) INOPERATIVE .