The function of the ignition system is to convert the battery voltage to the high voltage used to ignite the air/fuel mixture in the cylinder. We find the primary side In the ignition system, and it includes the battery, the ignition switch, the coil, an activation mechanism, and a switching device. Also, there is a secondary side, the coil pack and the spark plugs are inside in it.
The coil is used to transform the low voltage of the primary circuit to a high voltage on the secondary side. This voltage is needed to activate the plugs. DTC code P0350 OBD2 refers to the control circuit of the coil. It is set when it is detected that one of the circuits in the ignition coil is not completing by the time the ground pulse is applied. When this happens, this code is stored and the Check Engine light is illuminated.